摘要
借助XRD,SEM,HP4140B微电流计和HP4274A阻抗分析仪等测试手段,研究实验制备的BCZN[(Bi1.5Ca0.5)(Zn0.5Nb1.5)O7]陶瓷试样介电性能,并第一次提出了介电常数临界温度和介质损耗临界温度的概念。结果表明:BCZN陶瓷是高频稳定形陶瓷,具有面心立方焦绿石结构,且在最佳烧结温度和保温时间下,为均一的α相单相结构;在很宽的频率范围内,介电常数较高(εr≈81)且很稳定,介质损耗很小(tanδ≈-1.0×10-4);它的介电常数在温度低于介电常数临界温度时,与温度呈线性关系,在温度高于介电常数临界温度时,发生高温突变;介质损耗在温度低于介质损耗临界温度时几乎不变,在温度高于介质损耗临界温度时,发生高温突变;介电常数临界温度和介质损耗临界温度都随频率的升高而升高。
The dielectric properties of Bi_(2)O_(3)-CaO-ZnO-Nb_(2)O_(5) systemceramic is investigated by XRD,SEM,HP4140B micro electricalcurrent galvanometer and HP4274Aimpedanceanalysis instrument. Dielectric constant critical temperature and dielectricloss critical temperatureare first defined.The result of test shows that Bi_(2)O_(3)-CaO-ZnO-(Nb_2O_5) systemceramicis stable in high frequency. Its crystal structureis a pure cubic pyrochlore and it has uniform α phase structure in best sintering temperatureand heat-kept time. Its dielectric constant(ε_(r)≈81)is high and stable and its dielectric loss(tgδ≈-1.0×10^(-4))is low in a very widen frequency band. Its dielectric constant is linear relation with temperature belowcritical temperature and fiercely increasesabove critical temperature. Its dielectric loss is nearly unvaried below critical temperatureand fiercely increasesabove critical temperature. Critical temperatureincreases with frequencyincreasing.
出处
《无机盐工业》
CAS
北大核心
2005年第1期23-25,28,共4页
Inorganic Chemicals Industry
