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- W2514620411 abstract "Abstract The polycrystalline magnesium–zinc ferrite chromate having the chemical formula Mg 1−x Zn x FeCrO 4 (0.0 ≤ x ≤ 1.0) were prepared by conventional solid phase reaction using high purity reagents. The structural and electrical properties at room temperature have been investigated by XRD, TEM, SEM, EDS, TGA, DTA, FT-IR and DC electrical resistivity techniques. The lattice parameters such as the lattice constant, average particle size, bonds length, density, porosity and volume shrinkage were found to vary with increasing Zn 2+ content in the sample. The lattice constant “a” increases from 8.361 A for MgFeCrO 4 to 8.382 A for ZnFeCrO 4 spinels. The IR spectra confirm the presence of two main absorption bands υ 1 and υ 2 in the frequency range of 400–1000 cm −1 , arising due to the tetrahedral (A) and octahedral (B) stretching vibrations respectively. Values of υ 1 and υ 2 decrease with increasing Zn +2 content over the whole composition range. The scanning electron microscope (SEM) and transmission electron microscope (TEM) micrographs showed aggregates of stacked large grains. Values of the room temperature DC electrical resistivity decrease as Zn 2+ content increases. The low values of the vacancy model parameters indicate that the Mg 1−x Zn x FeCrO 4 spinels are strongly defective and the participation of the Zn 2+ vacancies in the improvement of the electrical conductivity in these spinels. The thermo-gravimetric, TGA and differential thermal analysis, DTA show loss of mass caused by vaporization of the surface and trapped water molecules at higher temperatures." @default.
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- W2514620411 date "2016-02-01" @default.
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- W2514620411 title "Influence of Zn 2+ ions on the structural and electrical properties of Mg 1−x Zn x FeCrO 4 spinels" @default.
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- W2514620411 doi "https://doi.org/10.1016/j.jallcom.2015.10.157" @default.
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