La-Nb双施主掺杂BaTiO_3陶瓷的研究  

Effect of Lanthanum-Niobium Codoped on Microstructure and Dielectric Properties of Barium Titanate Ceramics

作　　者：王悦辉[1] 王婷[1] 石士考[1] 沈建红[1] 周济[1] 

机构地区：[1]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《四川大学学报（自然科学版）》2005年第S1期252-254,共3页Journal of Sichuan University(Natural Science Edition)

基　　金：国家863计划(2003AA32G030);973计划(2002CB613306)

摘　　要：采用固相法进行La2O3和Nb2O5两种施主添加剂复合掺杂(Ba1-xLa2x/3)(Ti1-xNb4x/5)O3陶瓷改性研究.研究结果表明,La-Nb双施主掺杂(Ba1-xLa2x/3)(Ti1-xNb4x/5)O3陶瓷烧结体晶相为准立方相.当x=0.05时,陶瓷烧结体内存在Ba6Ti17O40富钛的第二相.当x>0.2时,Ba3La3Ti5Nb5O30固溶体作为第二相析出.随着La-Nb双施主掺杂剂掺量的增加,晶粒尺寸减小,介电常数下降,介电常数随温度变化率降低,表现明显的移峰、展峰作用.The influence of Lanthanum-Niobium donor-dopants concentrations on microstructure evolution and dielectric properties was investigated for the ceramics with compositions of (Ba_ 1-x La_ 2x/3 )(Ti_ 1-x Nb_ 4x/5 )O_ 3 ( 0.05 x 0.3 ). The samples were prepared by the solid-state reaction method. The crystal structures of solid solutions were pseudocubic for all samples.In the case of low donor-dopants concentration, secondary titanium-rich phase occured. With the increase of donor-dopants concentration, B...

关 键 词：La-Nb双施主掺杂介电性能 

分 类 号：TM28[一般工业技术—材料科学与工程]