کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
613568 880724 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study of the formation of perovskite type lanthanum ruthenates by heating their hydrous precursor
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Study of the formation of perovskite type lanthanum ruthenates by heating their hydrous precursor
چکیده انگلیسی

Emanation thermal analysis (ETA), differential thermal analysis (DTA), thermogravimetry (TG), evolved gas analysis with mass spectrometric detection (EGA-MS), and X-ray diffraction (XRD) were used to investigate the formation of perovskite type lanthanum ruthenates on heating their hydroxide precursor in argon from 20 to 1200 °C. The co-precipitated lanthanum–ruthenium mixed hydroxide containing a small amount of carbonates was used as a precursor. The mass loss corresponding to the release of water and CO2 from the precursor was determined by TG and EGA (MS), respectively. The ETA characterized the exposure of sample surface after release of water and CO2, as well as microstructure development corresponding to the crystallization and structure ordering of LaRuO3 and La3.5Ru4.0O13 perovskite phases. The obtained information on formation of phases and their transformation is useful for optimizing their synthesis protocols for achieving the desired physical properties, and to estimate the thermal stability of these materials to be used as catalysts.

Emanation thermal analysis, DTA, TG-EGA, and XRD were used to study the formation of perovskite type lanthanum ruthenates on heating their hydroxide precursor. The ETA characterized the microstructure development corresponding to the crystallization and structure ordering of LaRuO3 and La3.5Ru4.0O13 perovskite phases.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 300, Issue 1, 1 August 2006, Pages 232–236
نویسندگان
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