Publications

2009

Boron carbides from first principles
- Vast Nathalie
- Sjakste Jelena
- Betranhandy Emmanuel
Journal of Physics: Conference Series, IOP Science, 2009, 176, pp.n/a. In this work, we focus on the understanding gained from the investigation of the physical properties of boron carbides with theoretical methods based on density functional theory (DFT). Together with the examination of the DFT total energies of various atomic configurations in the unit cell, comparison with the experiments of the theoretical vibrational or NMR spectra has led to the determination of the atomic structure of B4C as C-B-C chains linking mostly B11C icosahedra, and a few percents of B10C2 icosahedra. In the icosahedron, the carbon atom is found to be in the polar site (B4Cp). When there are two carbon atoms, they are found to be in antipodal polar positions. At carbon concentrations other than 20%, we find that only four structural models have a negative formation energy with respect to a formation from alpha-boron + diamond. Moreover, they all have a positive formation energy with respect to B4Cp, showing a tendency to decompose into B4Cp + alpha-boron or B4Cp + diamond. This metastability explains actual difficulties in the synthesis of clean samples, in particular for B13C2. Finally, the idea of combining high hardness and superconductivity in the same material by doping boron-rich solids has emerged. We show results on the strength of the electron-phonon coupling constant obtained with DFT-based methods in B13C2. (10.1088/1742-6596/176/1/012002)
DOI : 10.1088/1742-6596/176/1/012002
Exciton-exciton interactions in CdWO4 irradiated by intense femtosecond vacuum ultraviolet pulses
- Kirm M.
- Nagirnyi V.
- Feldbach E.
- de Grazia M.
- Carre Bertrand
- Merdji Hamed
- Guizard Stéphane
- Geoffroy G.
- Gaudin Jerome
- Fedorov N.
- Martin P.
- Vasil'Ev A. N.
- Belsky A.N.
Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2009, 79, pp.233103. Exciton-exciton interaction is experimentally revealed and quantitatively analyzed in a wide band-gap scintillator material CdWO4. Under high-intensity femtosecond vacuum ultraviolet excitation, the CdWO4 luminescence is quenched, while its decay becomes essentially nonexponential. We propose an analytical model, which successfully reproduces the decay kinetics recorded in a wide range of excitation densities. The dipole-dipole interaction between excitons leading to their nonradiative decay is shown to be the main cause of a nonproportional response common for many scintillators. (10.1103/PhysRevB.79.233103)
DOI : 10.1103/PhysRevB.79.233103
UV-cured coatings based on waterborne resins and SiO2 nanoparticles
- Di Gianni Anna
- Bongiovanni Roberta
- Turri Stefano
- Deflorian Flavio
- Malucelli Giulio
- Rizza Giancarlo
Journal of Coatings Technology and Research, Springer Verlag (Germany), 2009, 6 (2), pp.177-185. The UV curing technique in combination with the use of waterborne resins is very attractive since it gives the opportunity to get solid coatings by means of ecofriendly processes. We found that it is possible to use such UV curable water-based formulations as matrices for the preparation of nanocomposites in which the filler is generated in situ by means of the sol-gel chemistry. We prepared silica-based nanocomposites and characterized them comparing their performances with those of the silica-free coatings. Moreover, the article discusses the influence of the addition of a coupling agent between the organic and inorganic phase on the final properties of the nanocomposite (10.1007/s11998-008-9137-1)
DOI : 10.1007/s11998-008-9137-1
Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1 xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density
- Hashimoto Kenishiro
- Shibauchi Takasada
- Kasahara Shigeru
- Ikada K.
- Tonegawa S.
- Kato Terukazu
- Okazaki Ryuji
- van Der Beek Cornelis Jacominus
- Konczykowski Marcin
- Takeya Hiroyuki
- Hirata Kazuto
- Terashima T.
- Matsuda Yuji
Physical Review Letters, American Physical Society, 2009, 102, pp.207001. We report high-sensitivity microwave measurements of the in-plane penetration depth ab and quasiparticle scattering rate 1= in several single crystals of the hole-doped Fe-based superconductor Ba1 xKxFe2As2 (x 0:55). While a power-law temperature dependence of ab with a power 2 is found in crystals with large 1= , we observe an exponential temperature dependence of the superfluid density consistent with the existence of fully opened two gaps in the cleanest crystal we studied. The difference may be a consequence of different levels of disorder inherent in the crystals. We also find a linear relation between the low-temperature scattering rate and the density of quasiparticles, which shows a clear contrast to the case of d-wave cuprate superconductors with nodes in the gap. These results demonstrate intrinsically nodeless order parameters in the Fe arsenides. (10.1103/PhysRevLett.102.207001)
DOI : 10.1103/PhysRevLett.102.207001
Comparison of ZnO nanostructures grown using pulsed laser deposition, metal organic chemical vapor deposition, and physical vapor transport
- E. Sandana V.
- J. Rogers D.
- Hosseini Teherani F.
- Bayram C.
- Razeghi M.
- Drouhin H.-J.
- Clochard M.C.
- Sallet V.
- Garry G.
Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures, American Vacuum Society (AVS), 2009, 27 (3), pp.1678-1683. This article compares the forms and properties of ZnO nanostructures grown on Si(111) and c-plane sapphire (c-Al(2)O(3)) substrates using three different growth processes: metal organic chemical vapor deposition (MOCVD), pulsed laser deposition (PLD), and physical vapor transport (PVT). A very wide range of ZnO nanostructures was observed, including nanorods, nanoneedles, nanocombs, and some novel structures resembelling "bevelled" nanowires. PVT gave the widest family of nanostructures. PLD gave dense regular arrays of nanorods with a preferred orientation perpendicular to the substrate plane on both Si and c-Al(2)O(3) substrates, without the use of a catalyst. X-ray diffraction (XRD) studies confirmed that nanostructures grown by PLD were better crystallized and more highly oriented than those grown by PVT and MOCVD. Samples grown on Si showed relatively poor XRD response but lower wavelength emission and narrower linewidths in PL studies. (10.1116/1.3137990)
DOI : 10.1116/1.3137990
Lower critical fields of superconducting PrFeAsO1−y single crystals
- Okazaki Ryuji
- Konczykowski Marcin
- van Der Beek Cornelis Jacominus
- Kato Terukazu
- Hashimoto Kenishiro
- Shimozawa M.
- Shishido Hiroaki
- Yamashita Minoru
- Ishikado Motoyuki
- Kito Hijiri
- Iyo Akira
- Eisaki Hiroshi
- Shamoto Shin-Ichi
- Shibauchi Takasada
- Matsuda Yuji
Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2009, 79, pp.064520. We have studied the lower critical fields Hc1 of superconducting iron oxipnictide PrFeAsO1−y single crystals for H parallel and perpendicular to the ab planes. Measurements of the local magnetic induction at positions straddling the sample edge by using a miniature Hall-sensor array clearly resolve the first flux penetration from the Meissner state. The temperature dependence of Hc1 for H c is well scaled by the in-plane penetration depth without showing any unusual behavior, in contrast to previous reports. The anisotropy of penetration lengths at low temperatures is estimated to be 2.5, which is considerably smaller than the anisotropy of the coherence lengths. This is indicative of multiband superconductivity in this system in which the active band for superconductivity is more anisotropic. We also point out that the local induction measured at a position near the center of the crystal, which has been used in a number of reports for the determination of Hc1, might seriously overestimate the obtained Hc1 value. (10.1103/PhysRevB.79.064520)
DOI : 10.1103/PhysRevB.79.064520
The self-energy beyond GW: Local and nonlocal vertex corrections
- Romaniello Pina
- Guyot Steve
- Reining Lucia
The Journal of Chemical Physics, American Institute of Physics, 2009, 131 (15), pp.154111.
Double excitations in finite systems
- Romaniello Pina
- Sangalli Davide
- Berger Arjan
- Sottile Francesco
- Molinari Luca G.
- Reining Lucia
- Onida Giovanni
The Journal of Chemical Physics, American Institute of Physics, 2009, 130 (4), pp.044108.
Upper and lower critical magnetic fields of superconducting NdFeAsO1−xFx single crystals studied by Hall-probe magnetization and specific heat
- Pribulova Z.
- Klein Thierry
- Kacmarcik J.
- Marcenat C.
- Konczykowski M.
- L. Bud'Ko S.
- Tillman M.
- C. Canfield P.
Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2009, 79, pp.020508(R). The upper and lower critical fields have been deduced from specific heat and Hall-probe magnetization measurements in nonoptimally doped Nd O,F FeAs single crystals Tc 32-35 K . The anisotropy of the penetration depth is temperature independent and on the order of 4.0 1.5. Similarly specific-heat data lead to an anisotropy of the coherence length 5.5 1.5 close to Tc. Our results suggest the presence of rather large thermal fluctuations and the existence of a vortex liquid phase over a broad temperature range 5 K large at 2 T . (10.1103/PhysRevB.79.020508)
DOI : 10.1103/PhysRevB.79.020508
Irradiation effects in oxide glasses doped with transition and rare-earth elements
- Malchukova E.
- Boizot B.
- Petite G.
- Ghaleb D.
European Physical Journal: Applied Physics, EDP Sciences, 2009, 45 (1), pp.10701. The effect of -irradiation on silicate and aluminoborosilicate glasses doped with transition metals (TM) and rare earth (RE) elements has been studied using Electron Paramagnetic Resonance (EPR), Raman and luminescence spectroscopy. Irradiation leads to the reduction of both Cr and Mn ions in both types of glass matrix. It is shown that even small amounts of TM dopants completely block defect production, as occurs under irradiation in non-doped glasses. As well, TM doping results in the disappearance of structural changes in the glass (densification, polymerization increase and Na migration) for doses of ~ 10 Gy. Unlike TM-doped matrices, incorporation of RE ions into aluminoborosilicate glass blocks neither defect production nor structural changes in glass matrices during irradiation. Simultaneously, we observe a reduction of RE ions, most clearly demonstrated for Ce ions in aluminoborosilicate glasses. We propose that the relative stability of the different charge states of the RE ions is linked to the efficiency of the reduction process, and therefore to the evolution of the glass structure during irradiation. (10.1051/epjap:2008185)
DOI : 10.1051/epjap:2008185
A local noise measurement device for magnetic physical systems
- L’hôte D
- Nakamae S
- Ladieu F
- Mosser V.
- Kerlain A
- Konczykowski M
Journal of Statistical Mechanics: Theory and Experiment, IOP Publishing, 2009, 2009 (01). We present an experimental setup developed to measure locally the fluctuations of the magnetization of physical systems such as spin and superspin glasses. It is based on micronic and submicronic Hall probes. We present the noise reduction at ambient temperature owing to the use of the spinning current technique. Finally, we show why, with such probes, the noise measured on a macroscopic sample probes only a microscopic volume of the sample. (10.1088/1742-5468/2009/01/P01027)
DOI : 10.1088/1742-5468/2009/01/P01027
Noise Measurement of Interacting Ferromagnetic Particles with High Resolution Hall Microprobes
- Komatsubara K.
- L'Hote D.
- Nakamae S.
- Ladieu F.
- Mosser V.
- Kerlain A.
- Konczykowski M.
- Dubois E
- Dupuis V
- Perzynski R
AIP Conference Proceedings, American Institute of Physics, 2009. We present our first experimental determination of the magnetic noise of a superspin‐glass made of <1 pico‐liter<1 pico‐liter frozen ferrofluid. The measurements were performed with a local magnetic field sensor based on Hall microprobes operated with the spinning current technique. The results obtained, though preliminary, qualitatively agree with the theoretical predictions of Fluctuation‐Dissipation theorem (FDT) violation [1]. (10.1063/1.3140418)
DOI : 10.1063/1.3140418
Pierre Auger – Lise Meitner. Comparative contributions to the Auger effect
- Hardouin Duparc Olivier
International Journal of Materials Research (Zeitschrift für Metallkunde), 2009, 100, pp.1382-1388. It has been claimed by R. Sietmann that the attribution of the discovery of the so-called ‘Auger' effect to Pierre Auger was a false attribution and that Lise Meitner should have got the credit for that discovery. However Sietmann himself recognized that Meitner's description of this effect was ‘buried in' two larger papers whose primary concern was nuclear physics. Sietmann only mentioned Auger's 1925 article and did not mention his 1923 article, an omission now found in many places. We examine again L. Meitner's and P. Auger's contributions to the description of the ‘Auger' effect. Meitner's concern was the exact nature of the (nuclear) beta radiations about which she opposed Ch. D. Ellis, and this had been the subject of an intense Berlin—Cambridge controversy where Ellis' description eventually prevailed. Auger's observations were the central theme of his PhD thesis at the J. Perrin's laboratory on the composed photoelectric effect. We thus believe that while L. Meitner should have shared the Nobel Prize with O. Hahn, the Auger effect has rightly been attributed to Auger.
Optical and magnetic properties of boron fullerenes
- Botti Silvana
- Castro Alberto
- N. Lathiotakis Nektarios
- Andrade Xavier
- A. L. Marques Miguel
Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2009, 11, pp.4523. We report linear response properties of the recently proposed boron fullerenes [N. Gonzalez Szwacki et al., Phys. Rev. Lett., 2007, 98, 166804]: magnetic susceptibilities, static dipole polarizabilities and dynamical polarizabilities (i.e. optical and near ultraviolet absorption spectra), calculated from first principles within the (time-dependent) density-functional theory framework. We find that all clusters except B80 are diamagnetic. The strong cancellation between diamagnetic and paramagnetic currents in B80 leads to a very small value for its susceptibility that turns out to be slightly paramagnetic. Static polarizabilities increase linearly with the number of B atoms. Furthermore, the absorption spectrum of B80 is very different from the one of its carbon counterpart C60, exhibiting a low absorption threshold of about 1.5 eV and many peaks in the visible and near ultraviolet. This can be understood by the analysis of the wavefunctions involved in the low energy transitions. (10.1039/b902278c)
DOI : 10.1039/b902278c
Conductance of disordered semiconducting nanowires and carbon nanotubes: a chain of quantum dots
- Dayen Jf
- Wade Tl
- Rizza G.
- Golubev Ds
- Cojocaru C.S.
- Pribat D.
- Jehl X.
- Sanquer M.
- Wegrowe J.E.
European Physical Journal: Applied Physics, EDP Sciences, 2009, 48 (1), pp.10604. A comparative study of the low temperature conductivity of an ensemble of multiwall carbon nanotubes and semiconductor nanowires is presented. The quasi one-dimensional samples are made in nanoporous templates by electrodeposition and CVD growth. Three diﬀerent structures are studied in parallel: multiwall carbon nanotubes, tellurium nanowires, and silicon nanowires. It is shown that the Coulomb blockade regime dominates the electronic transport below 50 K, together with weak and strong localization eﬀects. In the Coulomb blockade regime, a scaling law of the conductance measured as a func- tion of the temperature and the voltage is systematically observed. This allows a single scaling parameter α to be deﬁned. This parameter accounts for the speciﬁc realization of the "disorder", and plays the role of a ﬁngerprint for each sample. Correlations between α and the conductance measured as a function of temperature and voltage, as a function of the perpendicular magnetic ﬁeld, and as a function of the temperature and voltage in the localized regime below 1 K have been performed. Three universal laws are reported. They relate the coeﬃcient α (1) to the normalized Coulomb blockade conductance GT (α), (2) to the phase coherence length lφ (α), and (3) to the activation energy Ea(α). These observations suggest a description of the wires and tubes in terms of a chain of quantum dots; the wires and tubes break into a series of islands. The quantum dots are deﬁned by conducting islands with a typical length on the order of the phase coherence length separated by poorly conducting regions (low density of carriers or potential barriers due to defects). A corresponding model is developed in order to put the three universal laws in a common frame. (10.1051/epjap/2009132)
DOI : 10.1051/epjap/2009132
Radiolytic oxidation of UO2 pellets doped with alpha-emitters (238/239Pu)
- Muzeau B.
- Jégou C.
- Delaunay F.
- Broudic V.
- Brevet A.
- Catalette H.
- Simoni E.
- Corbel C.
Journal of Alloys and Compounds, Elsevier, 2009, 467, pp.578-589. To assess the impact of alpha radiolysis of water on the oxidative dissolution of UO2 under anoxic conditions, two series of plutonium-doped samples (specific alpha activity 385 and 18 ) were fabricated, characterized and leached in water of varying complexity (pure water, carbonated water, dissolved hydrogen). Given the very high reactivity of these samples in the presence of air and in order to minimize any prior surface oxidation, a strict experimental protocol was developed based on high-temperature annealing in Ar + 4% H2 with preleaching cycles. Failure to follow this protocol prevents absolute quantification of oxidation of the UO2 surface by water radiolysis in solutions. Preoxidation of the pellet surface can lead to uranium release in solution that is dependent on the alpha particle flux, revealing initial oxidation by radiolysis in air including potential traces of water. This makes difficult the accurate quantification of the radiolytic oxidation in water solutions. Controlling the initial surface condition of the samples finally allowed us to demonstrate that radiolytic oxidation in water-saturated media is governed by several threshold effects for which the main parameters are the sample alpha activity and the hydrogen concentration. (10.1016/j.jallcom.2007.12.054)
DOI : 10.1016/j.jallcom.2007.12.054
Synthesis of hexakis(2-keto-3,6-anhydro)cyclomaltohexaose: structural studies and Pb2+ complexation evaluation
- Berthelot Thomas
- Chamot-Rooke Julia
- Baudin Cécile
Tetrahedron Letters, Elsevier, 2009, 50, pp.4251-4253. Molecules which scavenge heavy metals are of significant interest for medical applications such as toxic metal decontamination or medical imaging. We report the first synthesis of hexakis(2-keto-3,6-anhydro)cyclomaltohexaose in good yield using mild conditions (Swern oxidation). This potential synthon exhibits reactivity towards water which results in its total conversion into the per(gem-diol) derivative. The first computational study of Pb2+ complexation with per-3,6-anhydro-α-cyclodextrin in water is also reported. (10.1016/j.tetlet.2009.05.019)
DOI : 10.1016/j.tetlet.2009.05.019
The self‐energy beyond GW: Local and nonlocal vertex corrections
- Romaniello P.
- Guyot S.
- Reining L.
The Journal of Chemical Physics, American Institute of Physics, 2009, 131 (15), pp.154111-154111-12. no abstract
Alloying behaviour of binary transition metal systems
- Paidar Vaclav
- Hardouin Duparc Olivier
International Journal of Materials Research, 2009, 100, pp.308-310. The properties of A-B binary alloys are controlled by the mixed AB interaction potentials. The interfaces between two different metals are investigated for fictive mixed potentials spreading from A-type to B-type nature. The elemental AA and BB potentials are fixed. The tendencies towards formation of ordered structures on one side, and separation of phases on the other side are discussed. Description of interatomic forces respecting metallic character of bonding using many-body potentials is used. This approach can be helpful for applications of alloy potentials in models with complex structures of extended defects such as dislocation and grain boundaries and in assessment of their behaviour. (10.3139/146.110027)
DOI : 10.3139/146.110027
Mesoporous silica films with varying porous volume fraction: Direct correlation between ortho-positronium annihilation decay and escape yield into vacuum
- Liszkay L.
- Corbel C.
- Raboin L.
- Boilot J. -P.
- Perez P.
- Brunet-Bruneau A.
- Crivelli P.
- Gendotti U.
- Rubbia A.
- Ohdaira T.
- Suzuki R.
Applied Physics Letters, American Institute of Physics, 2009, 95 (12), pp.124103. The behavior of ortho-positronium (o-Ps) in mesoporous silica films implanted with low-energy positrons has been studied as a function of the film porous volume fraction. A lifetime spectrometer allowed determination of o-Ps annihilation decay both inside and outside of the film. A kinetic model is introduced that permits the determination of the yield and rate of escape of o-Ps into vacuum as well as the annihilation decay rate of the trapped o-Ps in the film. It is shown that these undergo a sudden change at a threshold porous volume fraction, above which the o-Ps escape rate to vacuum varies linearly with volume fraction. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3234381] (10.1063/1.3234381)
DOI : 10.1063/1.3234381
Hybrid organic-inorganic coatings based on thiol-ene systems
- M (sangermano M.) Sangermano
- G (colucci G.) Colucci
- M (fragale M.) Fragale
- G (rizza G.) Rizza
Reactive and Functional Polymers, Elsevier, 2009, 69 (9), pp.719-723. Hybrid organic-inorganic coatings based on thiol-ene systems were obtained by a UV-thermal dual-curing process. An improvement in mechanical properties and surface hardness was achieved because of the presence of the inorganic filler generated in situ via the sol-gel process. TEM analysis clearly evidenced the reduction of the nanosize dimensions of the inorganic silica domains by increasing the coupling agent content in the photocurable formulation
Structure and Magnetic Characterization of BiFeO3/YBa2Cu3O7 Bilayers
- Werner-Malento Krzysztof
- Tsarou Andrei
- Dluzewski P.
- Paszkowicz Wojciech
- Minikayev R.
- Sawicki Mikael
- van Der Beek Cornelis Jacominus
- Konczykowski Marcin
- Przyslupski Piotr
acta physica polonica, 2009, 115, pp.95. Bilayered epitaxial BiFeO3/YBa2Cu3O7 films were fabricated on (100) [(LaAlO3)(0.3)(Sr2TaAlO6)(0.7)] substrates by sputtering method, For structural comparison the bilayered BiFeO3/La0.67Sr0.33MnO3 films were also deposited on (100) SrTiO3 substrates. A weak ferromagnetic moment is observed in BiFeO3/YBa2Cu3O7 films. The mechanism responsible for weak ferromagnetic moment arises presumably from the epitaxy strain induced canted antiferromagnetic structure.
Local atomic order and optical properties in amorphous and laser-crystallized GeTe
- Wełnic Wojciech
- Wuttig Matthias
- Botti Silvana
- Reining Lucia
Comptes Rendus. Physique, Académie des sciences (Paris), 2009, 10, pp.514. In this work we study the role of short-range order changes upon amorphization on the optical properties of GeTe – a prototype phase change material employed for optical data storage. It is found that the profound change in the absorption is due to changes in the matrix elements of the optical transitions. The importance of the local distortions in the crystalline phase for the optical absorption are revealed as well. Modifying the degree of the distortions has a significant impact on the optical properties of the crystalline state and should therefore become a promising instrument to improve material properties for storage applications. Furthermore we study the effect of electron–electron and electron–hole interactions on the optical properties. This is achieved by evaluating many-body effects in the crystalline phase through a GW correction of eigenvalues and the solution of the Bethe–Salpeter equation. (10.1016/j.crhy.2008.09.002)
DOI : 10.1016/j.crhy.2008.09.002
On the atomic structure of an asymmetrical near Sigma=27 grain boundary in copper
- Couzinie J.P.
- Duparc O.H.
- Lartigue-Korinek S.
- Thibault-Penisson J.
- Decamps B.
- Priester L.
Philosophical Magazine Letters, Taylor & Francis, 2009, 89, pp.757-767. The atomic structure of an asymmetrical near Sigma = 27 {525} tilt grain boundary (GB) in copper is determined by coupling high-resolution transmission electron microscopy and molecular dynamics simulation. The average GB plane is parallel to {414} in crystal (1) and {343} in crystal (2). The detailed GB structure shows that it is composed of facets always parallel to {101} and {111} in crystals (1) and (2), respectively. The atomic structure of one facet is described using the structural units model. Each facet is displaced with respect to its neighbours by a pure step, giving rise to the asymmetry of the GB plane orientation. The energy of this asymmetrical GB is significantly lower than that of both the {525} symmetrical and the {11,1,11}/{111} asymmetrical Sigma = 27 GBs. One GB region displays another atomic structure with a dislocation that accounts for the misfit between interatomic distances in the {414} and {343} GB planes. (10.1080/09500830903282925)
DOI : 10.1080/09500830903282925
Charles Crussard's early contributions: Recrystallization in situ and a Grain Boundary study with J. Friedel and B. Cullity
- Hardouin Duparc Olivier
International Journal of Materials Research, 2009, 100, pp.1382-1388. Charles Crussard's discovery of what he called Recrystallization in situ in 1944 is compared with what Egon Orowan and Robert Cahn named Polygonization. The context of the previous research is recalled in order to show the novelty of these contributions. Progress in accurate deformation and observation techniques such as tensile machines and X-ray methods were important, as were theoretical models about plausible microscopic mechanisms. With Jacques Friedel and Barney Cullity, Ch. Crussard also wrote a pioneering article on grain boundaries, which contains an experimental study of the relative energies of both symmetrical and asymmetical grain boundaries observed in aluminium together with the first atomistic calculation of energies of symmetrical low and high angle tilt boundaries in several metals. This less well-known contribution is also recalled. (10.3139/146.110193)
DOI : 10.3139/146.110193

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