Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1476397 | Journal of the European Ceramic Society | 2007 | 4 Pages |
Abstract
Ba1âxSrxTiO3 (x = 0, 0.20, 0.25, 0.30 and 0.35) nanopowders were prepared by Pechini method from titanium isopropoxide, barium and strontium carbonates using citric acid as a chelating agent and ethylene glycol as an esterification agent. X-ray diffraction data show the formation of (Ba,Sr)TiO3 solid solutions, free from secondary phases as BaCO3 or Ti-rich oxides, when the polymeric precursors were calcined in air at 850 °C for 2 h. Ceramic pellets with relative density of 85-93% were obtained after sintering at 1350 °C for 3 h. High values of the dielectric constants (of â¼1500-12,000), low losses at the room temperature and a shift of the ferro-para phase transition temperature in the range of 7-127 °C with x decreasing were found. Lower values of the Curie constant for higher x indicate the increase of the chemical and electrical local heterogeneity degree.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Adelina Ianculescu, Daniela Berger, Massimo Viviani, Cristina Elena Ciomaga, Liliana Mitoseriu, Eugeniu Vasile, Nicolae DrÄgan, Dorel CriÅan,