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标题：Preparation and Characterization of Manganese Ferrite Aluminates
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作者：R. L. Dhiman ; S. P. Taneja ; V. R. Reddy 等
期刊名称：Advances in Condensed Matter Physics
印刷版ISSN：1687-8108
电子版ISSN：1687-8124
出版年度：2008
卷号：2008
DOI：10.1155/2008/703479
出版社：Hindawi Publishing Corporation
摘要：Aluminum doped manganese ferrites MnAl𝑥Fe2−𝑥O4 with 0.0≤𝑥≤1.0 have been prepared by the double ceramic route. The formation of mixed spinel phase has been confirmed by X-ray diffraction analysis. The unit cell parameter `𝑎𝑂' is found to decrease linearly with aluminum concentration due to smaller ionic radius of aluminum. The cation distributions were estimated from X-ray diffraction intensities of various planes. The theoretical lattice parameter, X-ray density, oxygen positional parameter, ionic radii, jump length, and bonds and edges lengths of the tetrahedral (A) and octahedral (B) sites were determined. 57Fe Mössbauer spectra recorded at room temperature were fitted with two sextets corresponding to Fe3