【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.更多还原

【Abstract】 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.更多还原