Crystal Structure of Ba<sub>x</sub>Sr<sub>1-x</sub>TiO<sub>3</sub>Fine Powder

• 作者: Brahim Elouadi Emad K. Al-Shakarchi Natheer B. Mahmood Xavier Feaugas
• 来源期刊: 现代物理(英文)
• 学科: 化学
• 关键词: Barium Strontium TITANATE OXALATE CO-PRECIPITATION Method X-Ray Diffraction Transmission Electron Microscope Ultra-Fine Powder
• 年，卷（期）: 2015,（1）
• 页码范围: 70-77
• 页数: 8页
• 分类号: O6

摘要

Various compositions of the system BaxSr1-xTiO3 (BST) have been elaborated both as fine powders and ceramic monoliths, using the co-precipitation route within a warmed supersaturated solution of oxalic acid. The appropriate stoichiometry was determined from the mixtures of precisely titrated aqueous solutions of cations chlorides (SrCl2, BaCl2, and TiCl4). The reason of this process was to apply low sintering temperature in production of BST samples with ultra-fine powders. These powders primarily calcined at (850°C) for (5 hr) were used to elaborate ceramics after pellets sintering at (1200°C) during (8 hrs). Indeed, XRD patterns were confirmed that the samples are a pure phase and a perovskite cubic structural type at (x = 0, 0.5, 0.6). Whereas, (x = 0.7, 0.8, 0.9, 1) showed a tetragonal phase. There is agreement between the FTIR and XRD analysis, by the relation of the wave vector (K) and lattice constant. It was deduced a stimulated relation between (x) and (K). The results of TEM, they were clear that the lowest particle sizes investigated of BST powders nearly (36 - 50 nm).