Neutron diffraction and Mössbauer study on FeGa x Cr2−x S4
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Ga doped sulphur spinel FeGa x Cr2−x S4 (x = 0.1 and 0.3) have been studied with X-ray, neutron diffraction, and Mössbauer spectroscopy. Rietveld refinement of X-ray, neutron diffraction, and Mössbauer spectroscopy lead to the conclusion that the samples are in inverse spinel type, where most Ga ions are present at octahedral site (B). The neutron diffractions on FeGa x Cr2−x S4 (x = 0.1) above 10 K show long range interaction behaviors and reveal a ferrimagnetic ordering, with the magnetic moment of Fe2+(−3.45 μB) aligned antiparallel to Cr3+ (+2.89 μB) at 10 K. Fe ions migrate from the tetrahedral (A) site to the octahedral (B) site with an increase in Ga substitutions. The electric quadrupole splittings of the A and B sites in Mössbauer spectra give direct evidence that Ga ions stimulate an asymmetric charge distribution of Fe ions in the A site.
Key wordsneutron diffraction magnetic structure charge structure cation distribution Mössbauer spectroscopy
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