【作者】 唐宇； 陈松； 韩艳玲； 王选理； 黄宇阳； 邓文；

【Author】 Tang Yu,Chen Song,Han Yanling,Wang Xuanli,Huang Yuyang,Deng Wen College of Physics Science and Technology,Guangxi University,Nanning 530004,China

【机构】 广西大学物理科学与工程技术学院；

【摘要】 通过测量不同La₂O₃含量的ZnLa_2xNb_2（1-x）O_（6-2x）微波介质陶瓷的介电常数、符合正电子湮没辐射多普勒展宽谱和寿命谱,获取了该陶瓷的介电常数和微观缺陷的信息。结果表明:当La₂O₃含量较低（x<0.20）时,随着La₂O₃含量的增加,样品的正电子平均寿命τ_m和缺陷浓度减小,样品的致密度、商谱谱峰和相对介电常数ε_r升高。当x=0.20时,陶瓷样品的正电子平均寿命τ_m和缺陷浓度的最小,样品的致密度、商谱谱峰和相对介电常数ε_r最高。当x>0.20时,样品的正电子平均寿命τ_m和缺陷浓度升高,样品的致密度、商谱谱峰和相对介电常数ε_r降低。更多还原

【Abstract】 The dielectric constant and micro-defect information of the ZnLa_2xNb_2（1-x）O_（6-2x） microwave dielectric ceramics with different La₂O₃ content can be obtained by measuring the dielectric constant,positron lifetime and coincidence Doppler broadening spectra.The experiment results show that for ZnLa_2xNb_2（1-x）O_（6-2x） dielectric ceramics with low La₂O₃ content（x<0.20）,with the increase of La₂O₃ content,the mean positron lifetimeτ_m and the concentration of defects decrease,while the density,the peak of the ration curve and the dielectric constant increase.The mean positron lifetimeτ_m and the concentration of defects reach minimum values,while the density,the peak of the ration curve and the dielectric constant reach maximum values at x=0.20.For x<0.20 sample,the mean positron lifetimeτ_m and the concentration of defects increase,while the density,the peak of the ration curve and the dielectric constant decrease.更多还原