کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9804028 | 1516477 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis, phase transition and thermal expansion studies on M2MgWO6 (MÂ =Â Ba2+ and Sr2+) double perovskites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
The high-temperature behavior of Ba2MgWO6 and Sr2MgWO6 double perovskite compounds is studied by high-temperature XRD (HT-XRD) and dilatometer. At ambient temperature, Ba2MgWO6 crystallizes in cubic symmetry with space group Fm-3m (a = 8.1345(2) Ã
and VÂ =Â 538.26(2)Â Ã
3, Z = 4). The later compound crystallizes in tetragonal symmetry with space group I4/m (a = 5.5876(1) and c = 7.9490(3) Ã
; VÂ =Â 248.18(1)Â Ã
3, Z = 2). HT-XRD studies on these compounds were carried out in the temperature range of 25-1200 °C at each 100 °C interval in the static air atmosphere. Ba2MgWO6 is found to expand linearly in the studied temperature range. At and above 300 °C, a cubic elpasolite-type phase is observed for Sr2MgWO6. Within the tetragonal lattice, this compound shows anisotropic expansion. In the temperature range of 25-1200 °C, the typical volume thermal expansion coefficients of Ba2MgWO6 and Sr2MgWO6 are 35.6 Ã 10â6 and 39.6 Ã 10â6 /°C, respectively. The details of the phase transition and thermal expansion are explained in this manuscript.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 390, Issues 1â2, 22 March 2005, Pages 100-105
Journal: Journal of Alloys and Compounds - Volume 390, Issues 1â2, 22 March 2005, Pages 100-105
نویسندگان
S.J. Patwe, S.N. Achary, M.D. Mathews, A.K. Tyagi,