负热膨胀
大气温度范围
非谐性
热膨胀
声子
软化
凝聚态物理
格子(音乐)
晶格常数
中子衍射
化学
衍射
热力学
材料科学
结晶学
晶体结构
物理
量子力学
复合材料
声学
作者
Tapan Chatterji,Thomas C. Hansen,Michela Brunelli,Paul F. Henry
摘要
We reported previously [T. Chatterji et al., Phys. Rev. B 78, 134105 (2008)] negative thermal expansion (NTE) in ReO3 in the limited temperature range from 2 to 220 K. Here we discovered NTE in ReO3 at higher-temperature region from 600 to 680 K. We determined the temperature variation in the lattice parameter and the unit cell volume of ReO3 by neutron diffraction. The temperature variation in the lattice parameter and the unit cell volume show two regions of NTE and two minima. We attribute the NTE of ReO3 to be the result of anharmonicity and anomalous softening of M3 phonon mode.
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