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- Zakaria, A.K.M., Asgar, M.A., Ahmed, F.U., Yunus, S.M., Azad, A.K., Paranjpe, S.K., Das, A.
(författare)
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Studies of Mn0.5Cr0.5Fe2O4 ferrite by neutron diffraction at different temperatures in the range 768K ³ T ³ 13K
- 2002
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Ingår i: Indian Journal of Pure & Applied Physics. ; 40, s. 46-53
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Tidskriftsartikel (refereegranskat)
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- Zakaria, A. K. M., et al.
(författare)
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Study of the magnetic structure in the spinel oxides MnGaxFe1-xCrO4 by neutron diffraction
- 2007
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Ingår i: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853 .- 1873-4766. ; 310:2, s. E968-E970
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Tidskriftsartikel (refereegranskat)abstract
- Magnetic properties of the spinel system MnGaxFe1-xCrO4 have been investigated using neutron diffraction (ND) technique in the temperature range 600K >= T >= 10 K. The distribution of the magnetic moments in the tetrahedral (A) and octahedral (B) sublattices and their ordering as a function of temperature and composition has been determined. Ferrimagnetic transition temperatures and spin compensation temperatures have been determined for all the specimens. The features observed in the ND results are explained in the light of competing inter and intra-sublattice exchange interactions. A diffuse signal was found to exist below the innermost Bragg reflection with a general increase with increasing compositions indicating the formation of short-range spin clusters.
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- Zakaria, A. K. M., et al.
(författare)
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Synthesis, cation distribution and crystal structure of the spinel oxides MnGaxFe1-xCrO4 by neutron diffraction
- 2006
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Ingår i: Physica. B, Condensed matter. - : Elsevier BV. - 0921-4526 .- 1873-2135. ; 385, s. 106-109
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Tidskriftsartikel (refereegranskat)abstract
- The spinel system MnGaxFe1-xCrO4 (x = 0-0, 0.25, 0.50, 0.75 and 1.0) was prepared by the solid state sintering method in air at 1523 K. X-ray and neutron powder diffraction measurements were performed on the samples at 295 K for structural characterization. Rietveld refinement of the neutron diffraction data revealed that all the samples of the series possessed cubic symmetry corresponding to the space group Fd3m. The distributions of the four cations Mn, Ga, Fe and Cr over the two sublattices and other crystallographic parameters were found. The lattice constant showed a decrease with increasing Ga content in the system. The magnetic structure at room temperature was found to be ferrimagnetic in the composition range x <= 0.50.
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