Abstract
Li 0.5 Fe 2.5 − x Rh x O 4 (x=0.25–1.50) has been studied by Mössbauer spectroscopy, superconducting quantum interference device magnetometry, and x-ray diffraction. The crystals are found to be a cubic spinel structure and have been classified into two different sets by crystallographic symmetry, the space group Fd3m for x=0.25–1.25 and the space group F4¯3m for x=1.50, respectively. The migration of Li ion has been confirmed by x-ray patterns and the results of Mössbauer analysis. The saturated magnetic moment measured at 4.2K and Mössbauer spectra taken at various temperatures with 6.0T applied field show that the spin structure of Li0.5Fe2.5−xRhxO4 has the collinear Néel model.
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