کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
674944 1459583 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Crystal structure and thermodynamic properties of potassium antimony tungsten oxide
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Crystal structure and thermodynamic properties of potassium antimony tungsten oxide
چکیده انگلیسی

In the present work potassium antimony tungsten oxide with pyrochlore structure is refined by the Rietveld method (space group Fd3m, Z = 8). The temperature dependences of heat capacity have been measured for the first time in the range from 7 to 370 K for this compound. The experimental data were used to calculate standard thermodynamic functions, namely the heat capacity Cp°(T), enthalpy H°(T) − H°(0), entropy S°(T) − S°(0) and Gibbs function G°(T) − H°(0), for the range from T → 0 to 370 K. The differential scanning calorimetry was applied to measure the incongruent melting temperature of compound under study. The high-temperature X-ray diffraction was used for the determining thermal expansion coefficients.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 499, Issues 1–2, 20 February 2010, Pages 155–159
نویسندگان
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