热收缩化合物——负热膨胀性及成因  

Negative thermal expansion compounds and their mechanisms

作　　者：陈骏[1] 邓金侠[1] 于然波[1] 孙策[1] 胡澎浩[1] 邢献然[1] 

机构地区：[1]北京科技大学物理化学系,北京100083

出　　处：《物理》2010年第10期691-698,共8页Physics

基　　金：国家杰出青年科学基金(批准号:50725415);国家自然科学重点基金(批准号:20731001);国家自然科学青年基金(批准号:50704003)资助项目

摘　　要：文章综述了负热膨胀化合物、负热膨胀机理与应用等方面的进展.负热膨胀是最近十多年来新兴的研究领域,目前已经发现较多化合物具有负热膨胀性能,它们广泛分布在类似ZrW2O8开放式框架结构化合物、磁性合金、反钙钛矿结构的Mn3AX、PbTiO3基铁电化合物、纳米颗粒等领域.在负热膨胀机理研究方面,原子热振动机理研究相对充分,成功地解释了一部分框架式结构化合物负热膨胀机理;然而,较多负热膨胀起源与非振动机理相关,如:物质磁性、铁电性、电子作用、纳米尺寸效应等.文章最后从实际应用角度出发对未来负热膨胀材料研究进行了展望.A review is presented of recent progress in the field of negative thermal expansion （NTE）, including compounds, mechanisms, and their possible applications. This is a new and promising research field that emerged in the last decade. So far, more and more compounds of many kinds have been found to exhibit NTE, including ZrW2O8-like compounds with an open framework, magnetic alloys, anti-perovskite Mn3AX, PbTiO3-based ferroelectric compounds, and nano-particles. The NTE mechanism with respect to atomic thermal vibration has been successfully applied to certain NTE compounds with an open framework. However, the mechanism for other NTE compounds is correlated to non-vibration effects, such as those caused by spontaneous magnetovolume effects, ferroelectric spontaneous polarization, electrons, and particle size. Finally, some suggestions are proposed for the improvement of future applications of NTE materials.

关 键 词：热学 负热膨胀 综述 零膨胀 磁性 铁电性 

分 类 号：O551[理学—热学与物质分子运动论]