Bibliographies thématiques / Single Crystalline Oxides - Twin Boundaries

Littérature scientifique sur le sujet « Single Crystalline Oxides - Twin Boundaries »

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Publié le 7 septembre 2023

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Articles de revues sur le sujet "Single Crystalline Oxides - Twin Boundaries"

Peng, Zhiming, Xuejun Jin, T. Y. Hsu (Xu Zuyao) et Emmanouel Pagounis. « Relaxation of twin boundaries in a Ni2MnGa single crystalline ». Materials Science and Engineering : A 481-482 (mai 2008) : 310–13. http://dx.doi.org/10.1016/j.msea.2006.11.180.

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Tachibana, Tomihisa, Takashi Sameshima, Takuto Kojima, Koji Arafune, Koichi Kakimoto, Yoshiji Miyamura, Hirofumi Harada, Takashi Sekiguchi, Yoshio Ohshita et Atsushi Ogura. « Evaluation of Silicon Substrates Fabricated by Seeding Cast Technique ». Materials Science Forum 725 (juillet 2012) : 133–36. http://dx.doi.org/10.4028/www.scientific.net/msf.725.133.

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We evaluated the properties of crystalline defects in silicon substrate, and clarified the origin of small-angle grain boundaries. In order to eliminate the effects of grain boundaries, the ingot was fabricated by unidirectional solidification technique with seed crystal. In single-crystalline region, Σ3 twin boundaries and SiC precipitates were observed near the seed crystal. No obvious relationship between twin boundaries and precipitates was observed. These defect decreased once and the precipitations appeared again. The density of precipitates increased through the crystal growth procedure. These precipitates were consisted of Si, C, and N. After the precipitation density increased, the small-angle grain boundaries appeared and some precipitates were observed at the boundaries. We considered the precipitations consisted of light element impurities such as C and N were one of the major origins of the small-angle grain boundary generation.

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Carter, C. Barry, et Lisa A. Tietz. « Interfaces in high-Tc superconducting oxides ». Proceedings, annual meeting, Electron Microscopy Society of America 47 (6 août 1989) : 178–79. http://dx.doi.org/10.1017/s0424820100152860.

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Interfaces in high-Tc superconducting oxides are influential during both the processing of bulk materials and the growth of thin epitactically aligned layers. In the first case, the formation of the superconducting phase involves the movement of phase boundaries during the solid-state reaction, while in the second, the phase boundary is formed as the superconducting material grows on the single-crystal substrate. Having formed the superconducting material, the superconducting phase will, in general, contain a large number of grain boundaries varying from the simple twin boundaries which can be produced during the cubic-to-tetragonal transformation, to low-angle grain boundaries, special high-angle grain boundaries, other high-angle grain boundaries and phase boundaries due to incomplete or on-going solid-state reactions. During the course of this presentation, recent results on these topics will be reviewed, paying particular attention to the more widely studied material, YBa2Cu3O6+x.The importance of grain boundaries in high-Tc superconducting oxides has been firmly established by the systematic analysis of Dimos et al who have shown that the misorientation of the grains in layers of YBa2Cu3O6+x which had been grown on polycrystalline SrTiO3 substrate varies with the relative misorientation between the grains.

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Rothová, Vĕra. « Diffusion in the Presence of Twin Boundaries ». Defect and Diffusion Forum 263 (mars 2007) : 201–6. http://dx.doi.org/10.4028/www.scientific.net/ddf.263.201.

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In this paper, four examples from the literature are introduced in which the presence of high density of twin boundaries could explain an anomalous diffusion behavior. (i) In the case of the grain boundary (GB) self-diffusion in nickel, leakage from the random GBs to considerably high fraction of deformation and/or annealing twins in the samples studied can be a reason for the diverse literature values of activation enthalpy. The diffusion model including participation of two types of GBs is essential for data evaluation. (ii) Segregation of Ge atoms with negligible solubility to twin boundaries and diffusion in both type A and type AB transition regime can clarify the unusual 71Ge diffusion in the Mg alloys. (iii) Anomalous diffusion of gold in polycrystalline silicon presented in the literature was discussed here. Because profiles corresponding to type AB transition regime were detected, transition from type B to type A diffusion regime could be an alternative explanation of the anomaly. (iv) Effective diffusion of the 63Ni tracer in the presence of unidirectional defects in single-crystalline β-tin might be a simple reason for the uncommon features published earlier: low activation enthalpy, high diffusion anisotropy and values of the extrapolated solid-state Ni diffusion coefficients above those in the Sn liquid phase.

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Simpson, Yonn Kouh, et C. Barry Carter. « The interaction between basal-twin boundaries and a glassy phase in α-Alumina compacts ». Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988) : 570–71. http://dx.doi.org/10.1017/s0424820100104911.

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Understanding the nature of glass/crystalline interfaces is not only of fundamental scientific interest but is directly relevant to the liquid-phase sintering of polycrystalline ceramics such as α-alumina. Faceting behavior of alumina in the presence of SiO2 glass has been of much interest in the field of sintering with respect to the grain growth and the grain boundary mobility during sintering. The study of grain boundaries containing a glassy phase in alumina compacts is difficult however, since many of the TEM techniques presently available for the identification of a glassy phase at grain boundaries can give ambiguous results due to grain boundary grooving. A method for systematically studying glassy / crystalline interfaces without such ambiguity is therefore needed. Part of this study of the interaction of grain boundaries in alumina with an anorthite-based glassy phase is presented here.Previous systematic studies4 of different low-index surfaces of single crystal alumina showed that there is strong anisotropy in the faceting behavior of alumina and in the mobility of these facets in the presence of an anorthite-based glassy phase.

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Sheng, Huaping, He Zheng, Shuangfeng Jia, Lei Li, Fan Cao, Shujing Wu, Wei Han, Huihui Liu, Dongshan Zhao et Jianbo Wang. « Twin structures in CuO nanowires ». Journal of Applied Crystallography 49, n^o 2 (24 février 2016) : 462–67. http://dx.doi.org/10.1107/s1600576716001461.

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The structural characteristics of monoclinic CuO nanowires (NWs) fabricated by heating pure Cu in ambient air were investigated by electron microscopy. Besides the single-crystalline NW, four different twinned NWs with twinning planes of (11\bar 1), (002), (110) and {{(20\bar 2)}} have been found. The twin boundaries are generally in parallel with the NW axial direction. To the best of the authors' knowledge, the {{(11\bar 1)}} and (110) twins are reported for the first time in CuO. Moreover, the prevailing existence of {{(11\bar 1)}} and (002) twinned NWs could be closely related to the NW growth as well as the oxidation processes of Cu. The presented results provide a systematic investigation on the twin structures of CuO NWs, which may open up a pathway to explore new potential applications of CuO nanostructures.

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Fan, Lisha, Xiang Gao, Thomas O. Farmer, Dongkyu Lee, Er-Jia Guo, Sai Mu, Kai Wang et al. « Vertically Aligned Single-Crystalline CoFe2O4 Nanobrush Architectures with High Magnetization and Tailored Magnetic Anisotropy ». Nanomaterials 10, n^o 3 (5 mars 2020) : 472. http://dx.doi.org/10.3390/nano10030472.

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Micrometer-tall vertically aligned single-crystalline CoFe2O4 nanobrush architectures with extraordinarily large aspect ratio have been achieved by the precise control of a kinetic and thermodynamic non-equilibrium pulsed laser epitaxy process. Direct observations by scanning transmission electron microscopy reveal that the nanobrush crystal is mostly defect-free by nature, and epitaxially connected to the substrate through a continuous 2D interface layer. In contrast, periodic dislocations and lattice defects such as anti-phase boundaries and twin boundaries are frequently observed in the 2D interface layer, suggesting that interface misfit strain relaxation under a non-equilibrium growth condition plays a critical role in the self-assembly of such artificial architectures. Magnetic property measurements have found that the nanobrushes exhibit a saturation magnetization value of 6.16 μB/f.u., which is much higher than the bulk value. The discovery not only enables insights into an effective route for fabricating unconventional high-quality nanostructures, but also demonstrates a novel magnetic architecture with potential applications in nanomagnetic devices.

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Ou, Limin, Shengheng Nong, Ruoxi Yang, Yaoying Li, Jinrong Tao, Pan Zhang, Haifu Huang et al. « Multi-Role Surface Modification of Single-Crystalline Nickel-Rich Lithium Nickel Cobalt Manganese Oxides Cathodes with WO3 to Improve Performance for Lithium-Ion Batteries ». Nanomaterials 12, n^o 8 (12 avril 2022) : 1324. http://dx.doi.org/10.3390/nano12081324.

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Compared with the polycrystalline system, the single-crystalline ternary cathode material has better cycle stability because the only primary particles without grain boundaries effectively alleviate the formation of micro/nanocracks and retain better structural integrity. Therefore, it has received extensive research attention. There is no consistent result whether tungsten oxide acts as doping and/or coating from the surface modification of the polycrystalline system. Meanwhile, there is no report on the surface modification of the single-crystalline system by tungsten oxide. In this paper, multirole surface modification of single-crystalline nickel-rich ternary cathode material LiNi0.6Co0.2Mn0.2O2 by WO3 is studied by a simple method of adding WO3 followed by calcination. The results show that with the change in the amount of WO3 added, single-crystalline nickel-rich ternary cathode material can be separately doped, separately coated, and both doped and coated. Either doping or coating effectively enhances the structural stability, reduces the polarization of the material, and improves the lithium-ion diffusion kinetics, thus improving the cycle stability and rate performance of the battery. Interestingly, both doping and coating (for SC-NCM622-0.5%WO3) do not show a more excellent synergistic effect, while the single coating (for SC-NCM622-1.0%WO3) after eliminating the rock-salt phase layer performs the most excellent modification effect.

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Sarikaya, Mehmet, Ryoichi Kikuchi et I. A. Aksay. « Geometry and formation of twins in YBa2Cu3O7-x ». Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988) : 852–53. http://dx.doi.org/10.1017/s0424820100106326.

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Geometry and formation of twins in the orthorhombic YBa2Cu3O7-x phase are studied by transmission electron microscopy and modeling. Samples with bulk superconductivity at 90K are produced by heating the stoichiometric 1:2:3 proportions of metal oxides with a single heat treatment schedule involving a heating rate of 5°C/min to 950°C (1 hr) and 1°C/min cooling to room temperature. Powder mixtures were formed by colloidal mixing of oxide powders or by molecular mixing techniques.Twinned domains with {110} twin boundaries, parallel to [001] of the orthorhombic lattice, usually form with both variants occurring in a single grain (Fig. 1). The twin boundary separation λ (Fig. 2) is dictated by energetic and geometrical requirements which are both related to Δa = b — a, where b and a are lattice parameters of the orthorhombic phase. Geometrical requirements lead to the estimate that the stable values of λ are integer values of the basic distance d.

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Daneu, Nina, Goran Dražič, Matjaž Mazaj, Fabrice Barou et José Alberto Padrón-Navarta. « Formation of contact and multiple cyclic cassiterite twins in SnO₂-based ceramics co-doped with cobalt and niobium oxides ». Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 78, n^o 4 (27 juillet 2022) : 695–709. http://dx.doi.org/10.1107/s2052520622006758.

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Contact and multiple cyclic twins of cassiterite commonly form in SnO2-based ceramics when SnO2 is sintered with small additions of cobalt and niobium oxides (dual doping). In this work, it is shown that the formation of twins is a two-stage process that starts with epitaxial growth of SnO2 on CoNb2O6 and Co4Nb2O9 seeds (twin nucleation stage) and continues with the fast growth of (101) twin contacts (twin growth stage). Both secondary phases form below the temperature of enhanced densification and SnO2 grain growth; CoNb2O6 forms at ∼700°C and Co4Nb2O9 at ∼900°C. They are structurally related to the rutile-type cassiterite and can thus trigger oriented (epitaxial) growth (local recrystallization) of SnO2 domains in different orientations on a single seed particle. While oriented growth of cassiterite on columbite-type CoNb2O6 grains can only result in the formation of contact twins, the Co4Nb2O9 grains with a structure comparable with that of corundum represent suitable sites for the nucleation of contact and multiple cyclic twins with coplanar or alternating morphology. The twin nucleation stage is followed by fast densification accompanied by significant SnO2 grain growth above 1300°C. The twin nuclei coarsen to large twinned grains as a result of the preferential and fast growth of the low-energy (101) twin contacts. The solid-state diffusion processes during densification and SnO2 grain growth are controlled by the formation of point defects and result in the dissolution of the twin nuclei and the incorporation of Nb5+ and Co2+ ions into the SnO2 matrix in the form of a solid solution. In this process, the twin nuclei are erased and their role in the formation of twins is shown only by irregular segregation of Co and Nb to the twin boundaries and inside the cassiterite grains, and Co,Nb-enrichment in the cyclic twin cores.

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