摘要
在现代精密器件中,因存在热梯度,材料的热膨胀成为一个重要的影响因素。通常材料受热后因化学键的伸长而产生膨胀,而仍有一些材料显示异常的(低的或负的)热膨胀特性,这些特性值得深入研究,并以期设计具有应用可能的热膨胀系数可控的材料。众所周知,材料的异常热膨胀特性与框架构造化合物中的晶体结构常存在密切关系。近年来,人们对AMo2O8,APO4,A2Mo3O12类系列框架构造化合物进行了研究,以了解晶体结构对其热膨胀特性和相转变过程的影响。本文综合评述了影响这类材料热膨胀特性和相转变过程相关的结晶学研究结果。
Thermal expansion of materials is an important constraint in the modem precise technological devices facing the thermal gradients. Though all the materials expand on heating due to the thermal expansion of chemical bonds, there are several materials which exhibit anomalous （low or negative） thermal expansion behavior. Such materials become lucrative for the fundamental understanding as well as in designing tunable thermal expansion materials for technological applications. It has been known that the anomalous thermal expansion behaviors of materials are the direct consequences of their crystal structure which are commonly observed in the framework architect compounds. Recently, a large number of AMo2O8,APO4,A2Mo3O12 type framework compounds have been studied to understand the role of crystal structure on thermal expansion behavior and phase transition. The results of detailed crystallographic studies relating the structural intricacies to their thermal expansions and phases transitions are reviewed in this article.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2009年第5期703-714,共12页
Journal of The Chinese Ceramic Society
关键词
负热膨胀
框架构造化合物
晶体结构
相变
X射线衍射
中子衍射
膨胀计
thermal expansion
negative thermal expansion
crystal structure
phase transition
X-ray diffraction
neutron diffraction
dilatometer
