Tunability and reiaxor properties of ferroelectric barium stannate titanate cera

2019-08-14 09:18:07

materials effects ferroelectric physics O3

责任者: Lu, S.G.;Xu, Z.K.;Chen, Haydn 单位: Department of Physics, City University of Hong Kong, Kowloon, Hong Kong 来源出处: Applied Physics Letters,2004,85(22):5319-5321 摘要: Barium stannate titanate [Ba(SnxTi1-x)O3, x=0.1, 0.2, 0.3, and 0.4] ceramics were prepared using a conventional solid-state reaction process. Their dielectric properties were measured under direct current bias fields ranging from 0 to 2.5 kV/cm. A transformation from normal to relaxor ferroelectrics was observed when x greater than or equal 0.3. Broken long-range order or dirty ferroelectric domains and nanodomains were observed in Ba(Sn0.1Ti0.9)O3 and Ba(Sn 0.4Ti0.6)O3 by transmission electron microscopy, respectively. Voltage driven tunability was found to decrease with increasing Sn content. The change from normal ferroelectric into relaxor ferroelectric had a negative impact on the tunability value of the materials. © 2004 American Institute of Physics. 关键词: Ceramic materials;Barium compounds;Ferroelectric materials;Dielectric materials;Permittivity;Crystalline materials;Electric field effects;Thermal effects;Vacuum;Natural frequencies;Transmission electron microscopy;Microscopic examination;Mathematical models;Tunability;Dielectric shifts;Pinning effects;Band-pass shifters