کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1613874 | 1516322 | 2013 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydrothermal synthesis, magnetism and resistivity of orthorhombic perovskite manganates Y1âxCaxMnO3 (x = 0, 0.07, 0.55, 0.65)
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
Orthorhombic Y1âxCaxMnO3 (x = 0, 0.07, 0.55, 0.65) crystals were successfully prepared in one step via the mild hydrothermal synthesis, and the magnetic and electric properties were investigated in detail. The formation and composition of Y1âxCaxMnO3 crystals mainly depend on the molar ratios of starting materials, reaction temperature and alkalinity of the reaction system. The magnetic properties of Y1âxCaxMnO3 strongly depend on the doping content of Ca. Y1âxCaxMnO3 (x = 0, 0.07 and 0.55) demonstrate the spin-glass-like behaviors. Y1âxCaxMnO3 (x = 0.55 and 0.65) show charge ordering and antiferromagnetic transition, and the antiferromagnetic state is stabilized by charge ordering. The signal of charge ordering transition of Y1âxCaxMnO3 (x = 0.65) is very strong and its magnetization increases significantly below 46 K due to the Dzyaloshinsky-Moriya (DM) anisotropic super-exchange interaction. The charge transport of samples that have charge ordering takes on the behavior of semiconductors. They show a small magnetoresistance effect. Their electric conduction mechanism accords with the variable-range hopping mode of highly correlated electrons.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 571, 15 September 2013, Pages 123-131
Journal: Journal of Alloys and Compounds - Volume 571, 15 September 2013, Pages 123-131
نویسندگان
Zhiqiang Zhou, Li Guo, Feng Ye,