DEPENDENCE OF MICROWAVE DIELECTRIC PROPERTIES ON STRUCTURAL CHARACTERISTICS OF ILMENITE,TRI-RUTILE AND WOLFRAMITE CERAMICS  

作　　者：EUNG SOO KIM CHANG JUN JEON 

机构地区：[1]Department of Materials Engineering,Kyonggi University 94-6 Yiei-dong,Youngtong-gu Suwon,443-760,Korea

出　　处：《Journal of Advanced Dielectrics》2011年第1期127-134,共8页先进电介质学报（英文）

基　　金：This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education,Science and Technology(2009-0078000).

摘　　要：Effects of crystal structures on dielectric properties of ATiO_(3)(trigonal ilmenite),ATa_(2)O_(6)(tetragonal tri-rutile)and AWO_(4)(monoclinic wolframite)(A=Ni,Mg,Co)ceramics with A-and B-site oxygen octahedra were investigated at microwave frequencies.The dielectric constant(K) of the specimens was affected by the dielectric polarizabilities of composition and cation bond valence between octahedral cation and oxygen ion per molar volum(V_(m)).The quality factor(Qf)of ATiO_(3)was appreciably larger than those of ATa_(2)O_(6)and AWO_(4)due to the different sharing types of oxygen octahedra.The temperature coe±cient of resonant frequency(TCF)of the specimens was dependent on the octahedral distortion per V_(m).

关 键 词：Microwave dielectric properties dielectric polarizabilities bond valence octahedral distortion 

分 类 号：TQ1[化学工程]