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首页> 外文期刊>Physica status solidi, B. Basic research >Large scale supercell calculations for forces around substitutional defects in NiTi
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Large scale supercell calculations for forces around substitutional defects in NiTi

机译:NiTi置换缺陷周围力的大规模超级电池计算

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摘要

Density functional calculations are used to investigate the interatomic forces that arise if Ti atoms are substituted by Ni or Cu defect atoms. For the experimentally found monoclinic B19' ground state structure, these forces are calculated for the unrelaxed atomic positions by the Korringa-Kohn-Rostoker Green-function method. The force field in the vicinity of the defects is markedly different in 32- and 256-atom supercells while it is nearly the same in 256- and 2048-atom supercells. This difference is explained by symmetry arguments and discussed as a possible explanation for the concentration dependent transition from the high-temperature B2 phase to low temperature B19' or strain glass phases.
机译:密度泛函计算用于研究Ti原子被Ni或Cu缺陷原子取代时产生的原子间力。对于实验找到的单斜B19基态结构,这些力是通过Korringa-Kohn-Rostoker格林函数方法计算的,用于未松弛的原子位置。缺陷附近的力场在32和256原子超级电池中明显不同,而在256和2048原子超级电池中几乎相同。该差异由对称性参数解释,并作为从高温B2相到低温B19'或应变玻璃相的浓度依赖转变的可能解释进行讨论。

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