Materials Science of Antiperovskites

本文研究了反钙钛矿结构化合物Mn_3AX（A=过渡金属，X=轻元素，如N）的磁结构关联物理，以开发各种智能材料。在四方畸变的反钙钛矿Mn 3SbN中发现了高达1000 ppm的巨磁致伸缩。一个广泛的最大值的温度-电阻率曲线中也发现在Mn 3AgN，尽管其整体的金属特性。利用具有巨大负热膨胀的反钙钛矿型氮化锰制备了热膨胀可调的金属或塑料基复合材料。所得复合材料的热膨胀是广泛可调的，甚至是负的。从磁结构和局部结构异常的角度探讨了锰系反钙钛矿巨负热膨胀的物理背景。

Physics of magnetostructural correlations in compounds with antiperovskite structure Mn3AX (A=transitional metals; X=light elements such as N) have been investigated, in order to develop various kinds of smart materials. Giant magnetostriction up to 1000 ppm was discovered in tetragonally distorted antiperovskite Mn3SbN. A broad maximum in the temperature-resistivity curve was also discovered in Mn3AgN, despite its overall metallic character. Thermal expansion adjustable metal or plastic matrix composites were fabricated using antiperovskite manganese nitrides exhibiting giant negative thermal expansion. Thermal expansion of the obtained composites is widely tunable, even negative. The physical background of the giant negative thermal expansion in the manganese antiperovskites was also explored in terms of the relation to the magnetic structure and the local structure anomaly.