溶胶–凝胶法制备NBT-KBT系陶瓷及其电性能  

Electric properties of Na_(0.5)Bi_(0.5)TiO_(3-)K_(0.5)Bi_(0.5)TiO_3 system ceramics prepared by sol-gel method

作　　者：廖润华[1] 李月明[1] 王竹梅[1] 江向平[1] 

机构地区：[1]号德镇陶瓷学院材料科学与工程学院,江西景德镇333001

出　　处：《电子元件与材料》2009年第3期60-63,共4页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.50562002);江西省自然科学基金资助项目(No.650074);教育部新世纪优秀人才计划资助项目(No.NCET-06-0576)

摘　　要：采用sol-gel法制备（1-x）Na0.5Bi0．5TiO3-xK0．5Bi0.5TiO3（x=0．12—0．50）系无铅压电陶瓷。XRD分析表明，当X=0．18-0．30时陶瓷具有三方-四方相共存的晶体结构，为该陶瓷的准同型相界（MPB）。在MPB附近存在最佳的电性能：d33为150pC／N，kp为36．7％，ε33^τ／εo为1107，tanδ为1.1×10^-2，Qm为168．8，Np为2949．7Hz·m。与常规固相法相比，sol-gel法有利于提高该陶瓷的电性能。分析了该陶瓷材料在1，10和100kHz下的介电温谱，发现该陶瓷是一类弛豫型铁电体材料。A sol-gel method was applied to prepare the （1-x）NNa0.5Bi0.5TiO3-K0.5Bi0.5TiO3 （x = 0.12-0.50） system lead-free piezoelectric ceramics. XRD results reveal that the ceramics have trigonal and tetrgonal coexistent phase structures which are near the morphotropic phase boundary （MPB） when x varies from 0.18 to 0.30. The ceramics possess the best piezoelectric and dielectric properties of d33=150 pC/N, kp = 36.7%, ε33^τ/εo = 1 107, tang = 1.1×10^-2, Qm=168.8 and Np = 2 949.7 Hz· m near the MPB. Compared with the conventional solid-state reaction method, the ceramic samples prepared by sol-gel method exhibit better electric properties. At the same time, the relative permittivity （ετ） and dielectric loss （tanδ） as a function of temperature under 1, 10 and 100 kHz respectively was analyzed, and it was found that the ceramic is a kind of relaxor ferroelectric material.

关 键 词：无机非金属材料 Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3 溶胶-凝胶法 无铅压电陶瓷 准同型相界 

分 类 号：TM223[一般工业技术—材料科学与工程]