کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1476397 | 1510146 | 2007 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigation of Ba1âxSrxTiO3 ceramics prepared from powders synthesized by the modified Pechini route
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 27, Issues 13â15, 2007, Pages 3655-3658
Journal: Journal of the European Ceramic Society - Volume 27, Issues 13â15, 2007, Pages 3655-3658
نویسندگان
Adelina Ianculescu, Daniela Berger, Massimo Viviani, Cristina Elena Ciomaga, Liliana Mitoseriu, Eugeniu Vasile, Nicolae DrÄgan, Dorel CriÅan,