冲击波作用下Pb(Zr_(0.95)Ti_(0.05))O_3铁电陶瓷去极化后电阻率动态特性  

Dynamic resistivity of Pb(Zr_(0.95)Ti_(0.05))O_3 depolarized ferroelectric under shock wave compression

作　　者：伍友成[1] 刘高旻[1] 戴文峰[1] 高志鹏[1] 贺红亮[1] 郝世荣[1] 邓建军[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,绵阳621900

出　　处：《物理学报》2017年第4期229-234,共6页Acta Physica Sinica

基　　金：国家高技术研究发展计划(批准号:2014AAX0X3029)资助的课题~~

摘　　要：在冲击波压力作用下,极化Pb(Zr_(0.95)Ti_(0.05))O_3(PZT95/5)铁电陶瓷会发生铁电-反铁电相变失去极化,由于冲击波压力高、作用时间短,伴随材料去极化相变出现的瞬态电导特性难以准确测试.本文建立了新的实验方法,采用脉冲电容器作为冲击波加载铁电陶瓷脉冲电源的输出负载,在冲击波压力约3.5 GPa的实验中直接测得铁电陶瓷的漏电流,计算得到PZT95/5铁电陶瓷去极化后的电阻率,变化范围为2.2×10~4—3.5×10~4?·cm;在实验数据的基础上,建立了动态电阻模型,对冲击波传播过程中PZT95/5铁电陶瓷去极化后的电阻率进行了分析,初步揭示了冲击波作用下PZT95/5铁电陶瓷去极化后电阻率的动态特性.Explosive-driven ferroelectric generator （EDFEG） has important applications due to its excellent properties of high energy density and small volume. The output of EDFEG is based on the depolarization of ferroelectric during shock wave compression. In a “normal mode” configuration, a planar shock wave propagates in a direction perpendicular to the polarization axis. If the resulting depolarizing current passes through a large resistive load or a small capacitive load, high electric fields can be produced within the ferroelectric sample. In this case, a portion of the depolarizing charges are lost in the sample due to finite resistivity of shocked ferroelectrics during shock wave transit. But it is very difficult to accurately measure the resistivity of shocked ferroelectric during shock wave compression, due to high pressure and short duration time. In previous studies, the value of the resistivity of shocked Pb（Zr0.95Ti0.05）O3 （PZT95/5） ferroelectric was obtained from the experimental output charge difference for different large resistive loads or by fitting the experimental current histories. However, the current leakage was not observed directly in experiment in the past. Furthermore, the value of the resistivity obtained in each of all these studies was a time-averaged value. In the present work, a new experiment method is developed to investigate dynamic resistivity of PZT95/5 under shock wave compression, in which a pulse capacitor is used as an output load. The current leakage in shocked PZT95/5 is observed in the experiment at a shock stress of 3.5 GPa after the depolarization of all ferroelectrics. This current leakage is just related to the resistance of shocked PZT95/5 and the voltage applied. The experimental results show that the resistivity of shocked PZT95/5 continuously changes in a range of 2.2×104 Ω·cm-3.5×104 Ω·cm for time more than the shock transit time of the sample. Based on the experimental results, a dynamic resistance model is established to analyze the resistivity o

关 键 词：PB (Zr0.95Ti0.05) O3 冲击波 去极化 电阻率 

分 类 号：TM28[一般工业技术—材料科学与工程]