文献类型：期刊文献

英文题名：Seeding acceleration of perovskite crystallization in lead calcium titanate thin films

作者：Shen, Hao[1]; Cheng, Jijian[1]; Chen, Guorong[1]

机构：[1]E CHINA UNIV SCI & TECHNOL,GLASS & CERAM RES INST,SHANGHAI 200237,PEOPLES R CHINA;[2]SHANGHAI INST BLDG MAT,DEPT INORGAN MAT,SHANGHAI 200434,PEOPLES R CHINA

年份：1997

卷号：220

期号：2-3

起止页码：231

外文期刊名：JOURNAL OF NON-CRYSTALLINE SOLIDS

收录：;EI(收录号：1998073969987);WOS:【SCI-EXPANDED(收录号:WOS:A1997YH74700015)】；

语种：英文

外文关键词：Activation energy - Crystal lattices - Crystallization - Ferroelectric materials - Lead compounds - Nucleation - Perovskite - Phase transitions - Reaction kinetics - Scanning tunneling microscopy - Thin films - X ray diffraction analysis

摘要：Seeding to enhance the kinetics of phase transformation was demonstrated with a special seeding process using crystallized ultrafine lead titanate powder to lower the temperature of perovskite formation of the modified lead calcium titanate thin films. X-ray diffraction and scanning electron microscopy show that the pyrochlore-to-perovskite phase transformation temperature of the seeded lead calcium titanate film can be lowered by as much as 50 degrees C when compared with the unseeded lead calcium titanate film. This is most likely related to the decrease of activation energies of nucleation which, in turn, increases the kinetics of the perovskite formation, since numerous nucleation sites are provided. The similarity, or small lattice mismatch of crystal structure between the lead titanate and perovskite of the modified lead calcium titanate film supports these explanations. (C) 1997 Elsevier Science B.V.