热膨胀
反铁磁性
中子衍射
化学
负热膨胀
凝聚态物理
各向异性
热的
衍射
热力学
结晶学
晶体结构
物理
量子力学
光学
作者
Yong Xu,Xin Chen,Yili Cao,Kun Lin,Chin-Wei Wang,Qiang Li,Jinxia Deng,Jun Miao,Xianran Xing
出处
期刊:Chinese Journal of Structural Chemistry
日期:2023-05-01
卷期号:42 (5): 100009-100009
被引量:4
标识
DOI:10.1016/j.cjsc.2022.100009
摘要
Thermal expansion is an essential issue in the field of materials science and engineering. Investigation of anomalous thermal expansion is beneficial to controlling it and developing related functions. Here, we report disitinctly anisotropic thermal expansion of CrB2 via temperature dependence of neutron diffraction, in which positive thermal expansion is observed within basal plane whereas negative thermal expansion emerges along the c direction. Intriguingly, zero thermal expansion of unit cell volume is determined from 5 to 130 K with the coefficient of thermal expansion of ᾱV = 0.4(1) × 10−6 K−1. Magnetization measurement shows there is an antiferromagnetic-paramagnetic transition near 90 K, which may correlate to the thermal expansion anomaly. DFT calculations identify no chemical binding of Cr–Cr pair, implying such antiferromagnetic ordering originates from the double exchange interaction of Cr–B–Cr.
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