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arXiv 2210.10367cond-mat.mtrl-sci
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通过调节c/a比实现过渡金属锆化物TrZr2的轴向热膨胀切换

Axis thermal expansion switching in transition-metal zirconides TrZr2 by tuning the c/a ratio

Hiroto Arima, Md. Riad Kasem, Yoshikazu Mizuguchi

AI总结:

本研究通过Tr位取代调节c/a比,在多种CuAl2型TrZr2化合物中实现了从正热膨胀到c轴单轴负热膨胀的切换,为设计零热膨胀材料提供了原则。

摘要:

本研究考察了多种CuAl2型化合物(包括NiZr2、(Co,Rh,Ir)Zr2、(Fe,Co,Rh,Ir)Zr2和(Co,Ni,Cu,Rh,Ir)Zr2)晶格常数随温度的变化,以探索负或零热膨胀。结果表明,NiZr2具有正热膨胀,而其他化合物沿c轴收缩表现出单轴负热膨胀。研究提出,通过Tr位取代调节c/a比可以控制c轴热膨胀,为在TrZr2化合物中实现c轴负热膨胀乃至单一化合物中的潜在零热膨胀提供了设计原则。

英文摘要:

This study examines the temperature-dependent evolution of the lattice constants for various CuAl2-type compounds, including NiZr2, (Co,Rh,Ir)Zr2, (Fe,Co,Rh,Ir)Zr2, and (Co,Ni,Cu,Rh,Ir)Zr2, in the pursuit of negative or zero thermal expansion. Results reveal that NiZr2 has positive thermal expansion, while the other compounds exhibit uniaxial negative thermal expansion along the c-axis contraction. The study suggests that the c-axis thermal expansion can be controlled by manipulating the c/a ratio through Tr-site substitution, providing a design principle for achieving negative thermal expansion of the c-axis and potentially zero thermal expansion in a single compound in TrZr2 compounds.

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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