新型钾基四方钨青铜结构化合物K3La3Ti2Nb8O30  

New Potassium-Based Oxide K3La3Ti2Nb8O30 with Tetragonal Tungsten Bronze-Type Structure

作　　者：夏禹 马力 徐军[1,2] XIA Yu;MA Li;XU Jun(School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China;Hubei Key Laboratory of Plasma Chemical and Advanced Materials(Wuhan Institute of Technology),Wuhan 430205,China)

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430205 [2]等离子化学与新材料湖北省重点实验室(武汉工程大学),湖北武汉430205

出　　处：《武汉工程大学学报》2020年第3期288-292,共5页Journal of Wuhan Institute of Technology

基　　金：武汉工程大学第十届研究生教育创新基金(CX2018065)。

摘　　要：根据四方钨青铜结构稳定性的晶体化学原理,设计了新型的钾基四方钨青铜结构化合物K3La3Ti2Nb8O30,并采用固相反应法对其进行了制备。采用X射线衍射仪表征其物相,发现除了少量杂相存在外,其主相可以确认为目标化合物,并采用扫描电子显微镜和能谱仪对其微观形貌和微观区域元素成分进行分析。使用精密阻抗分析仪对其不同频率下的介电温谱进行测量(20~600℃),结合结构容忍因子及A位离子平均半径所进行的预测结果,显示该化合物在室温(20℃)以下可能具有弛豫铁电性。We designed a new potassium-based tetragonal tungsten bronze(TTB)oxide composition K3La3Ti2Nb8O30 from empirical crystal chemistry principle of TTB structure stability,and synthesized the sample with conventional solid state reaction.The X-ray diffraction results show that the target compound K3La3Ti2Nb8O30 is successfully synthesized with a small amount of impurities,and its microstructures and elemental composition of the micro-area were analyzed by scanning electron microscopy and energy dispersive spectroscopy.Temperature dependence of dielectric property measured by precision impedance analyzer under various frequencies from 20℃to 600℃suggests that the new compound is a ferroelectric relaxor below room temperature(20℃),which is consistent with the prediction based on the structural tolerance factor and the A-site average radius in TTB compounds.

关 键 词：钨青铜 介电性能 容忍因子 固相法 弛豫铁电性 

分 类 号：TM282[一般工业技术—材料科学与工程]