Preparation, Characterization and Dielectric Property of Sr_5LaTi_3Nb_7O_(30) Ceramic  

作　　者：卓蓉晖 

机构地区：[1]Wuhan University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2004年第3期48-50,共3页武汉理工大学学报（材料科学英文版）

基　　金：FundedbytheNationalNaturalScienceFoundationofChi na (N0 .5 0 0 0 2 0 0 7)

摘　　要：Sr-5LaTi-3Nb-7O- 30 ceramic was prepared by the conventional high temperature solid-state reaction route. The sintered samples were characterized by X-ray diffraction, scanning electron microscopy (SEM), differential thermal calorimetry (DSC) and dielectric measurements.The results show Sr-5LaTi-3Nb-7O- 30 belongs to paraelectric phase of filled tetragonal TB structure at room temperature, and undergoes a diffuse phase transition in the temperature range of -54-34 ℃.And Sr-5LaTi-3Nb-7O- 30 ceramic shows a high dielectric constant of 479 with a low dielectric loss of 0.005 at 1MHz. In comparison with Ba-based ceramics with TB structure, the temperature coefficients of the dielectric constant (τ-ε) is significantly reduced.Sr-5LaTi-3Nb-7O- 30 ceramic was prepared by the conventional high temperature solid-state reaction route. The sintered samples were characterized by X-ray diffraction, scanning electron microscopy (SEM), differential thermal calorimetry (DSC) and dielectric measurements.The results show Sr-5LaTi-3Nb-7O- 30 belongs to paraelectric phase of filled tetragonal TB structure at room temperature, and undergoes a diffuse phase transition in the temperature range of -54-34 ℃.And Sr-5LaTi-3Nb-7O- 30 ceramic shows a high dielectric constant of 479 with a low dielectric loss of 0.005 at 1MHz. In comparison with Ba-based ceramics with TB structure, the temperature coefficients of the dielectric constant (τ-ε) is significantly reduced.

关 键 词：NIOBATE dielectric properties phase transition tungsten bronze 

分 类 号：TQ174[化学工程—陶瓷工业]