0.72Pb(Mg_(1/3)Nb_(2/3))O_3-0.28PbTiO_3弛豫铁电体中纳米极化区域温度特征实验研究

Experimental study on temperature features for polar-nano-regions among 0.72Pb(Mg_(1/3)Nb_(2/3))O_3-0.28PbTiO_3 relaxor ferroelectrics

利用同步辐射X射线小角散射实验方法,研究了0.72Pb(Mg1/3Nb2/3)O3-0.28PbTiO3弛豫铁电体中纳米极化区域(PNRs)在自发状态下随温度变化的响应特性。得到在自发状态下,PNRs从Tm(介电系数最大值所在温度)到Tm以上100K有沿轴向的稳定关联结构,该关联结构在Tm以上300K完全消失。结合以前的实验结果,得到PNRs在Tm附近约±20K的温度区间内存在的沿对角方向的周期性关联结构是材料高性能的来源之一。

X-ray small angle scattering experiment was conducted on a synchrotron radiation facility to study temperature-dependence features of polar-nano-regions （PNRs） among 0.72Pb（Mglt3Nb2t3）O3-0.28PbTiO3 relaxor-based ferroelectrics in a spontaneous state. PNRs have stable axially-aligned quasi-periodic correlation structure from Tm to temperature of 100K above Tm, this correlation structure disappears completely at temperature of 300K above Tin. Combined with the previous experimental results, the diagonally-aligned periodic correlation structure at temperature range of ±20K near Tm is considered as origin of high performance for this material.