کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1333241 | 979070 | 2010 | 8 صفحه PDF | دانلود رایگان |
The crystal structure and magnetism of Ca2−xLaxFeReO6 (0≤x≤0.8) double perovskites have been investigated. The samples with low doping (x≤0.4) are found to crystallize with the monoclinic P21/n superstructure, while those in the high doping ones (x≥0.6) have orthorhombic Pbnm superstructure. With the increase of an La doping, the anti-site defects increases, giving rise to highly disordered samples at the Fe and Re positions. At the low doping region (x≤0.4), the compounds undergo a simultaneous structural and magnetic transition accompanying a slight increase of the Curie temperature. The increase of Curie temperature is discussed in terms of the structural change with doping.
The crystal structures of Ca2−xLaxFeReO6 transform from monoclinic to orthorhombic; meanwhile, high degree of anti-site disorder was present at B/B′ position, which promotes AFM correlations as an La increases.Figure optionsDownload as PowerPoint slide
Journal: Journal of Solid State Chemistry - Volume 183, Issue 12, December 2010, Pages 2937–2944