%0 Journal Article
%T Relationship Between Dielectric Relaxation Behavior and B-site Ordering of Lead Magnesium Niobate Ferroelectric Ceramics<br>PMN铁电陶瓷B位有序与介电弛豫特性研究
%A LI Xin-Yuan
%A FENG Chu-De
%A LI Cheng-En
%A BAO Jun
%A <br>李新元
%A 冯楚德
%A 李承恩
%A 鲍军
%J 无机材料学报
%D 1998
%I Science Press
%X The mechanism of the B-site ordering and disordering in Lead Magnesium Niobate (PMN)was examined by using both heat treatment and La-doped methods. The B--site structural orderingcharacteristics were exposed by X-ray diffraction (XRD), selected area electron diffraction (SAED)and high-resolution electron microscopy (HREM). The reason of the pyrochlore phase presentingwith the La-doped increased was studied. Based on the analysis of dielectric properties, theincrease in the degree of diffuse phase transition (DPT) in annealed and La-doped PMN observedwas interpreted as the Mg2 :Nb5 = 1: 1 nonstoichiometric short-range ordered domain accompaniedwith the segregation of the Nb5 in the disordered area. Furthermore, it was demonstrated thatthe kinetic mechanism of the ordering micro-domain growing was ion diffusion equilibrium by theeffects of the heat treatment on DPT properties of the various amounts of La-doped.
%K relaxor ferroelectrics
%K order-disorder structure
%K diffuse phase transition
%K dielectric relaxtion<br>弛豫铁电体
%K 有序-无序结构
%K 弥散相变
%K 介电弛豫
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=ABC0063016AF57E1C73EF43C8D2212BD&aid=EB290F7852E805EDBA67D847F1D0C2A7&yid=8CAA3A429E3EA654&vid=FC0714F8D2EB605D&iid=B31275AF3241DB2D&sid=CE504F5B1E192581&eid=C81F81170838C444&journal_id=1000-324X&journal_name=无机材料学报&referenced_num=1&reference_num=15