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arXiv 1002.1215cond-mat.mtrl-sci
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[La,Sc]_2O_3固溶体介电性质的计算研究

Computational study of the dielectric properties of [La,Sc]2O3 solid solutions

Hiroyoshi Momida, Eric Cockayne, Naoto Umezawa, Takahisa Ohno

摘要:

采用第一性原理计算计算了立方相(方铁锰矿)和六方相La2O3中假想[La,Sc]2O3固溶体的介电常数。介电增强预测在小Sc浓度由于摇铃离子效应。类似的计算模型的非晶La2O3结构的介电常数的变化不大时,少量的Sc取代La。在这种情况下,Sc周围的局部环境以补偿振动离子效应的方式改变。

英文摘要:

First-principles calculations were used to compute the dielectric permittivities of hypothetical [La,Sc]2O3 solid solutions in the cubic (bixbyite) and hexagonal La2O3 phases. Dielectric enhancement is predicted at small Sc concentrations due to the rattling ion effect. Similar calculations for a model amorphous La2O3 structure show little change in permittivity when a small amount of Sc is substituted for La. In this case, the local environment around the Sc changes in a way that compensates for the rattling ion effect.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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