退火处理对PMN弛豫铁电体B位有序性研究

Effect of Heat Treatment on B site Ordering of Lead Magnesium Niobate Ferroelectric Ceramics

本文采用退火热处理方法， 利用高分辨透射电镜（ Ｈ Ｒ Ｅ Ｍ） 、选区电子衍射（ Ｓ Ａ Ｅ Ｄ） 、 Ｒａｍａｎ 光谱等技术对 Ｐ Ｍ Ｎ 中 Ｂ 位离子有序无序结构与微区化学组成的关系进行分析研究表明， 退火热处理有助于 Ｂ 位离子有序化； 并且 Ｂ

The mechanism of B site ordering and disordering in Lead Magnesium Niobate (PMN) was examined by heat treatment at different annealing time The B site structural ordering characteristics were exposed by selected area electron diffraction (SAED) and high resolution electron microscopy (HREM) By analyzing the different types of chemical bonds in the BO 6 network by the Raman spectroscopy, it was demonstrated that ordered domains in PMN are Mg rich region while disordered domains are Mg poor (or Nb rich)