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- W1971106970 abstract "The crystal structure of double perovskite Sr2FeMoO6 synthesized via solid-state reaction at 1280 °C under a reduction atmosphere is refined by Rietveld technique based on X-ray powder diffraction (XRD) data in 2θ range of 15–140°. An antisite content (AS), i.e. Fe on the Mo sites (=Mo on the Fe sites), of 12.1(1)% is derived. In reference to the refinement results, a series of X-ray and neutron powder diffraction (NPD) data with different antisite contents, ranging from 0 (completely ordered) to 50% (completely disordered), are generated with a Poisonian noise added and subjected to Rietveld refinements with the same initial values for the refinable parameters. The AS is reproduced satisfactorily from the refinement of XRD data and the combined refinement of XRD and NPD data with a relative deviation smaller than 4%, whereas the relative deviation of AS derived from the refinement of NPD data can be as large as 50%. However, the atomic occupancies and isotropic temperature factors of all the atoms can be reasonably reproduced from the refinement of NPD data and the combined refinement of XRD and NPD data, whereas these data can be reproduced only for cations (Sr, Fe, Mo) from the refinement of XRD data. The present simulation studies shed light on understanding the controversial statements derived from XRD and NPD work regarding the antisite defects in Sr2FeMoO6, which in turn is indispensable for understanding the mechanism of large room temperature low-field magnetoresistance of the compound." @default.
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- W1971106970 date "2006-05-01" @default.
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- W1971106970 title "Determination of antisite defects in double perovskite Sr2FeMoO6 by diffraction method: Simulation studies" @default.
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- W1971106970 doi "https://doi.org/10.1016/j.ssc.2006.03.008" @default.
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