Cation distribution and crystallographic characterization of the spinel oxides MgCrxFe2-xO4 by neutron diffraction
Artikel i vetenskaplig tidskrift, 2015

The spinel system MgCrxFe2-xO4 (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) has been prepared by solid state sintering method in air at 1573 K. X-ray and neutron powder diffraction experiments have been performed on the samples at room temperature for structural characterization. Rietveld refinement of the neutron diffraction data reveals that all the samples of the series possess cubic symmetry corresponding to the space group Fd-3m. The distribution of the three cations Mg, Fe and Cr over the two sublattices and other crystallographic parameters has been determined precisely. The results reveal that Cr has been substituted for Fe selectively. Cr ions invariably occupy the octahedral (B) site for all values of x. Mg and Fe ions are distributed over both A and B sites for all x values. With increasing x the occupation of Mg increases in the A site and decreases in the B site for all the samples, while the Fe ions gradually decreases in both the sites for all values of x. The lattice constant decreases with increasing Cr content in the system. The magnetic structure at room temperature was ferrimagnetic for all the samples.

Ferrimagnetic

Ferrite

Neutron diffraction

Crystal structure

Spinel structure

Författare

A. K. M. Zakaria

Institute of Nuclear Science and Technology, Atomic Energy Research Establishment

F. Nesa

Daffodil International University

Jahangirnagar University

M. A. S. Khan

Jahangirnagar University

T. K. Datta

Institute of Nuclear Science and Technology, Atomic Energy Research Establishment

S. Aktar

Institute of Nuclear Science and Technology, Atomic Energy Research Establishment

S. I. Liba

Institute of Nuclear Science and Technology, Atomic Energy Research Establishment

S. Hossain

Institute of Nuclear Science and Technology, Atomic Energy Research Establishment

A. K. Das

Institute of Nuclear Science and Technology, Atomic Energy Research Establishment

I. Kamal

Institute of Nuclear Science and Technology, Atomic Energy Research Establishment

S. M. Yunus

Institute of Nuclear Science and Technology, Atomic Energy Research Establishment

Sten Eriksson

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Journal of Alloys and Compounds

0925-8388 (ISSN)

Vol. 633 115-119

Ämneskategorier

Fysikalisk kemi

DOI

10.1016/j.jallcom.2015.01.179

Mer information

Skapat

2017-10-07