کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9837316 | 1525273 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural, magnetic and transport properties of double perovskite compounds (Sr2â3xLa2xBax)FeMoO6
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Structural, magnetic and transport properties of double perovskite compounds (Sr2â3xLa2xBax)FeMoO6 Structural, magnetic and transport properties of double perovskite compounds (Sr2â3xLa2xBax)FeMoO6](/preview/png/9837316.png)
چکیده انگلیسی
The crystal structure and magnetic properties of a series of ordered double perovskite oxides (Sr2â3xLa2xBax)FeMoO6 (0⩽x⩽0.3) have been investigated. X-ray powder diffraction reveals that the crystal structure of the compounds changes from a tetragonal I4/m lattice to a cubic Fm3¯m lattice around x=0.2. Though the nominal average size of the A site cation of (Sr2â3xLa2xBax)FeMoO6 is designed to be almost independent of x, the refinements of the crystal structure show that the lattice constants increase with x in both the tetragonal and the cubic phase regions due to electron doping. As the x increases, the degree of cationic ordering on the B site is decreased pronouncedly, while the Curie temperature of the compounds is nearly unchanged. The saturation magnetization of the compounds decreases with x and shows a linear dependence on the degree of cation ordering. The resistivity of the parent compound shows a semiconducting behavior below room temperature, but those of the doped samples exhibit a metal-semiconductor transition. A correlation between the resistivity and metal-semiconducting transition temperature (TMâS) is observed. The resistivity and TMâS of the compounds decrease with x for x⩽0.2 and increase for x⩾0.2. Magnetoresistance of the compounds is reduced by the La/Ba doping. All these observations can be understood based on the interplay of the electron doping, change in bandwidth and the anti-site defect concentration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 370, Issues 1â4, 15 December 2005, Pages 228-235
Journal: Physica B: Condensed Matter - Volume 370, Issues 1â4, 15 December 2005, Pages 228-235
نویسندگان
Q. Zhang, G.H. Rao, H.Z. Dong, Y.G. Xiao, X.M. Feng, G.Y. Liu, Y. Zhang, J.K. Liang,