摘要
用传统陶瓷工艺合成制备了（Ｐｂ０．９６Ｌａ０．０４）（Ｚｒ０．４０Ｔｉ０．６０）０．９９Ｏ３（ＰＬＺＴ）铁电陶瓷，并用Ｘ射线衍射对其结构进行了测定，表明室温下ＰＬＺＴ陶瓷为铁电四方相结构：ａ＝ｂ＝０．４０５５ｎｍ，ｃ＝０．４１０９ｎｍ，ｃ／ａ＝１．０１３．将ＰＬＺＴ陶瓷极化后，在抛光面进行压力为４９Ｎ的Ｖｉｃｋｅｒｓ压痕，并施加强度为０．４Ｅｃ，０．５Ｅｃ，０．６Ｅｃ（Ｅｃ＝１１００Ｖ／ｍｍ）的侧向电场．用场发射扫描电镜研究观察ＰＬＺＴ试样极化前、极化后以及在侧向电场作用下压痕裂纹附近铁电畴结构的形态及其变化．结果表明在０．６Ｅｃ的侧向电场作用下，压痕裂纹附近发生了９０°铁电畴变，在扫描电镜的铁电畴结构形貌图上再次出现了平直的９０°铁电畴界．探讨了９０°铁电畴变的形成及促发机制．
Lanthanum modified lead zirconate titanate ferroelectric ceramics, (Pb0.96La0.04)(Zr0.40Ti0.60)0.99O3 was synthesized by the conventional powder processing technique. XRD results reveal that the samples belong to the tetragonal phase with a=b=0.405 5 nm, c=0.410 9 nm, c/a=1.013. After polariation, the samples were indented by a 49 N Vickers indenter, and lateral electric fields of 0.4Ec, 0.5Ec,0.6Ec(Ec=1 100 V/mm) were applied respectively. Field emission scanning electron microscopy shows that 90 domain switching appears near the tip of the indentation-crack induced by a lateral electric field of 0.6Ec. A formation mechanism of the 90 domain switching is discussed.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1999年第3期310-315,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金
关键词
锆钛酸铅镧陶瓷
铁电畴
微结构
铁电陶瓷
电场
lanthanum modified lead zirconate titanate ceramics, ferro electric domain, microstructure, domain switching
