Ba_3La_2Ti_2Ta_2O_(15):A New Microwave Dielectricof A_5B_4O_(15)-type Cation-deficient Perovskites  

作　　者：胡长征 

机构地区：[1]Key Laboratory of New Processing Technology for Nonferrous Metals and Materials,Ministry of Education,Guilin University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2008年第3期422-424,共3页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.20571059 and No.50572078);Opening Foundation of Key Laboratory of New Processing Technology for Nonferrous Metals and Materials,Ministry of Education

摘　　要：The synthesis, structure and properties of a new A5B4O15-type cation-deficient perovskite Ba3La2Ti2Ta2O15 were discribed. The compound was prepared by the conventional solid-state reaction route. The phase and structure of the ceramics were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）. The results reveal that the compound is successfully synthesized. The compound crystallizes in the trigonal system with unit cell parameter a=5.6730（2） A, c=11.6511（2） A, V=324.93（1） A^3 and Z=1. The microwave dielectric properties of the ceramic are studied using a network analyzer, and it shows a high dielectric constant of 45.1, a high quality factors with Q×fof21 029 GHz, and a positive τf of 5.3 ppm℃^-1.The synthesis, structure and properties of a new A5B4O15-type cation-deficient perovskite Ba3La2Ti2Ta2O15 were discribed. The compound was prepared by the conventional solid-state reaction route. The phase and structure of the ceramics were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）. The results reveal that the compound is successfully synthesized. The compound crystallizes in the trigonal system with unit cell parameter a=5.6730（2） A, c=11.6511（2） A, V=324.93（1） A^3 and Z=1. The microwave dielectric properties of the ceramic are studied using a network analyzer, and it shows a high dielectric constant of 45.1, a high quality factors with Q×fof21 029 GHz, and a positive τf of 5.3 ppm℃^-1.

关 键 词：X-ray diffraction dielectric resonators microwave ceramics hexagonal perovskites 

分 类 号：O614.2[理学—无机化学]