Microstructure and dielectric properties of BaxSr1−xTiO3 ceramics

✍ Scribed by Chunlin Fu; Chuanren Yang; Hongwei Chen; Yinxin Wang; Liye Hu

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 146 KB
• Volume: 119
• Category: Article
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2005.02.056

✦ Synopsis

The crystalline structure and dielectric properties of Ba x Sr 1-x TiO 3 ceramics with x = 0.45, 0.5, 0.6, 0.65, 0.8, 0.9 were investigated. The a-and c-axis lattice constants of Ba x Sr 1-x TiO 3 ceramics were calculated and it is found that the crystal structures are tetragonal phase when x ≥ 0.65 at room temperature. The Curie-Weiss temperature (T 0 ) is always lower than Curie temperature (T C ) and the linear relation between the Curie temperature and the stoichiometric percentage of barium can be observed and expressed as T C ( • C) = -195.0 + 322.2x. The values of coercive electric field (E C ) and remanent polarization (P r ) increase as Ba/Sr ratio of Ba x Sr 1-x TiO 3 ceramics increases except for x ≤ 0.5, which are due to the decrease in grain size and the difference between the radius of Ba 2+ and that of Sr 2+ .