Phase content and dielectrical properties of sintered BaSrTiO ceramics prepared by a high temperature hydrothermal technique

• Published in: Ceramics international Vol. 35; no. 7; pp. 2781 - 2787
• Main Authors: Razak, K.A., Asadov, A., Gao, W.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2009
• Subjects: A. Powders: chemical preparation; B. X-ray methods; C. Dielectric properties; D. BaTiO 3 and titanates; B. X-ray methods; A. Powders: chemical preparation; C. Dielectric properties; D. BaTiO 3 and titanates
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2009.03.020

Ba x Sr 1− x TiO 3 ceramic powders with varying barium content were prepared by a high temperature hydrothermal technique and sintered at 1300 °C for 1–8 h. Their dielectrical, phase and structural properties were investigated. It was computed from the XRD spectra that the samples with a small amount of strontium, no more than 10% of the initial Ba:Sr share, had a single phase structure with x = 0.77–0.79 and Curie point T c = 37–53 °C. Samples with a higher initial Sr ratio developed a two-phase structure and two Curie points. T c( x) dependence showed that all the experimental data followed a linear trend and were close to the values obtained from the conventional solid state technique, while the dielectric constant was almost one order of magnitude smaller.