کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
675518 1459625 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Chimie douce synthesis and thermochemical characterization of mesoporous perovskite-type titanate phases
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Chimie douce synthesis and thermochemical characterization of mesoporous perovskite-type titanate phases
چکیده انگلیسی

Various compositions of perovskite-type titanates were synthesised by a chimie douce synthesis method with emphasis on low synthesis temperatures. The cations were complexed by citric acid as chelating agent forming a homogeneous organic/inorganic network. Thethermal decomposition of this xerogel precursor was investigated by thermogravimetric analysis (TGA). Simultaneous thermal analysis with mass spectrometry (MS) in combination with infrared spectroscopy (IR) allowed studying the precursor decomposition mechanism. The perovskite phase formation was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The citrate precursor was decomposed by two different preparation methods to evaluate the influence on the morphology and size of perovskite-type particles. The perovskite-type titanates obtained by thermal decomposition of precursors revealed well-defined mesoporous morphology. Ultrafine perovskite-type particles were also synthesized inside micro-droplets in an aerosol process using ultrasonic spray combustion (USC). This alternative preparation enhanced the specific surface area particles by a factor 3 reaching 50–60 m2/g.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 457, Issues 1–2, 15 June 2007, Pages 11–19
نویسندگان
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