掺杂不同比例Sr的La_(1-x)Sr_xMnO_3微结构研究  

Preparation and Microstructure Characterization of Sr-Doped La-(1-x)Sr_xMnO_3 Ceramics

作　　者：许旻[1] 杨丙文[1] 王洁冰[1] 吴春华[1] 赵印中[1] 李林[1] 左华平[1] 邱家稳[1] 

机构地区：[1]兰州空间技术物理研究所表面工程技术重点实验室,兰州730000

出　　处：《真空科学与技术学报》2013年第8期787-790,共4页Chinese Journal of Vacuum Science and Technology

基　　金：国防科技重点实验室基金项目(51468030105HT6002)资助

摘　　要：La1-xSrxMnO3材料具有热致相变特性,成为具有潜在应用前景的空间小卫星热控功能材料。La1-xSrxMnO3是一种结构非常敏感性材料,掺杂比例对其结构和性能影响很大。本项研究中采用传统的固相反应方法,通过控制烧结温度、退火时间、成分配比等关键工艺参数,制备出不同掺杂比例的La1-xSrxMnO3陶瓷片。利用X射线衍射分析了薄膜的成分、相结构、结晶情况。实验研究表明,La1-xSrxMnO3材料是结构敏感化合物,随着不同比例Sr掺杂,La1-xSrxMnO3材料的微结构将发生很大的变化。The Sr-doped La1-xSrxMnO3 ceramics,a potential material for the thermal control device of the micro-satellite were prepared by conventional solid state reaction.The microstructures,phase structures,and thermo-chromic properties of the ceramics were characterized with X-ray diffraction.The impacts of the processing conditions,including the Sr content,sintering temperature,annealing time,and stoichiometries of La and Sr,on the microstructures of the ceramics were evaluated to optimize the processing conditions.The preliminary results show that the Sr-content significantly affects the microstructures and phase structures of the ceramics.For example,as the doping level of Sr increased,the orthogonal distorted perovskite（x=0~0.1） phase changed into the rhombohedral phase（x=0.15~0.3）.Possible mechanisms responsible for the phase transition were also tentatively discussed.

关 键 词：钙钛矿 固相反应 相变 微结构 空间热控材料 

分 类 号：O782.8[理学—晶体学] O792