Abstract
Polycrystalline MgCr1.98Fe0.0257O4 compound was synthesized by sol-gel process. The crystal structure was found to be single-phase cubic spinel with space group of Fd3(−)m. The lattice constant a0 and the fractional coordinate (x) of the oxygen were determined to be 8.336Å and 0.260, respectively. The Cr–Cr linkages in ACr1.98Fe0.0257O4 (A=Mg,Zn) have bond lengths of 2.945 and 2.947Å, respectively. We have observed larger value of Néel temperature (TN=12–12.5K) in Mg, Zn chromite spinels than those of Cd, Hg-chromite spinel (TN=6–8K). Mössbauer spectra of MgCr1.98Fe0.0257O4 were taken from 4.2to295K using a Co57 source in a rhodium matrix. MgCr1.98Fe0.0257O4 Mössbauer spectra below TN show the line broadening due to bond frustration. Above the Néel temperature, paramagnetic doublet is observed. The magnetic properties and Mössbauer results can be explained by the B–B exchange interaction and bond frustration in MgCr1.98Fe0.0257O4.
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