Academic literature on the topic 'Single Crystalline Oxides - Twin Boundaries'

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Journal articles on the topic "Single Crystalline Oxides - Twin Boundaries"

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Bhide, Aniruddha, Suraj Gupta, Rinkoo Bhabal, et al. "Unveiling the kinetics of oxygen evolution reaction in defect-engineered B/P-incorporated cobalt-oxide electrocatalysts." Materials Today Energy 44, August 2024 (2024): 101638. https://doi.org/10.1016/j.mtener.2024.101638.

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Defect-rich transition-metal oxide electrocatalysts hold great promise for alkaline water electrolysis due to their enhanced activity and stability. This study presents a new strategy that significantly improve the OERactivity of Co-oxide nanosheets through incorporation of B and P (B/P-CoO<sub>x</sub> NS), eventually leading to abundant surface defects and oxygen vacancies. The B/P-CoO<sub>x</sub> NS demonstrates low overpotential of 220&nbsp;mV to achieve 10&nbsp;mA/cm<sup>2</sup>. The electrochemical and kinetic studies coupled with conventional morphological and structural characterization
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Peng, Zhiming, Xuejun Jin, T. Y. Hsu (Xu Zuyao), and Emmanouel Pagounis. "Relaxation of twin boundaries in a Ni2MnGa single crystalline." Materials Science and Engineering: A 481-482 (May 2008): 310–13. http://dx.doi.org/10.1016/j.msea.2006.11.180.

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Tachibana, Tomihisa, Takashi Sameshima, Takuto Kojima, et al. "Evaluation of Silicon Substrates Fabricated by Seeding Cast Technique." Materials Science Forum 725 (July 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
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Carter, C. Barry, and Lisa A. Tietz. "Interfaces in high-Tc superconducting oxides." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 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
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Rothová, Vĕra. "Diffusion in the Presence of Twin Boundaries." Defect and Diffusion Forum 263 (March 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 boundari
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Simpson, Yonn Kouh, та 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
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Sheng, Huaping, He Zheng, Shuangfeng Jia, et al. "Twin structures in CuO nanowires." Journal of Applied Crystallography 49, no. 2 (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 gr
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Fan, Lisha, Xiang Gao, Thomas O. Farmer, et al. "Vertically Aligned Single-Crystalline CoFe2O4 Nanobrush Architectures with High Magnetization and Tailored Magnetic Anisotropy." Nanomaterials 10, no. 3 (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
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Ou, Limin, Shengheng Nong, Ruoxi Yang, 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, no. 8 (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, m
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Sarikaya, Mehmet, Ryoichi Kikuchi, and 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 vari
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Dissertations / Theses on the topic "Single Crystalline Oxides - Twin Boundaries"

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Chakraborty, Tanushree. "The interplay between magnetism, defects and disorder in polycrystalline oxides." Thesis, 2019. http://hdl.handle.net/10821/8303.

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This thesis investigates the crucial role of defects and disorder in determining the structural, electrical and magnetic properties of a few transition metal oxides. In solid state physics, crystallinity or the periodicity of lattice plays a very significant role. All the basic theories are formulated considering perfectly ordered crystalline materials because this simplifies the structural description. However in reality, the arrangement of atoms or molecules in most crystalline materials is not perfect and often interrupted by crystallographic defects disrupting the perfect crystalline order
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