Multinary diamond-like chalcogenides for promising thermoelectric application

Thermoelectric(TE)materials have been considered as a strong candidate for recovering the waste heat from industry and vehicles due to the ability to convert heat directly into electricity.Recently,multinary diamond-like chalcogenides(MDLCs),such as Cu In Te_2,Cu_2Sn Se_3,Cu_3Sb Se_4,Cu_2ZnSnSe_4,etc.,are eco-friendly Pb-free TE materials with relatively large Seebeck coefficient and low thermal conductivity and have aroused intensive research as a popular theme in the TE field.In this review,we summarize the TE performance and device development of MDLCs.The features of crystalline and electronic structure are first analyzed,and then the strategies that have emerged to enhance the TE figure of merits of these materials are illustrated in detail.The final part of this review describes the advance in TE device research for MDLCs.In the outlook,the challenges and future directions are also discussed to promote the further development of MDLCs TE materials.     

转动结构在铜合金板带残余应力及变形检测中的应用

本文提出了一种转动结构用于铜合金冷轧板带残余应力检测以及面内形变的测量方法。用有限元法(FEM)对转动结构作了设计并优化以提高测量灵敏度、便于用线切割制备试样。在专用试验台上模拟残余应力释放,用应变仪和工具显微镜同时测量转动结构对应的应变和变形量输出,标定结果显示转动结构对残余应变检测灵敏度为0.49μm/10-6、相对偏差<4%,与FEM计算结果相吻合。分别用转动结构和化学腐蚀法对铜合金板带C194(600mm×0.23mm)纵向残余应力作了检测,两种方法的试验结果非常接近。本文提出的转动结构在精密铜合金板带残余应力和变形检测中具有测量准确、便捷、检测效率高的特点。