Abstract
X-ray, electrical conductivity, magnetic hysteresis and IR studies for the system Co2−x Ge1−x Fe2x O4 were carried out. All the compounds, 0⩽x⩽1, showed cubic symmetry. X-ray intensity calculations, magnetic hysteresis measurements and IR studies indicated the presence of Ge4+ at tetrahedral, Co2+ at octahedral and Fe3+ at both the sites. The activation energy and threshold frequency decreased with increasing value ofx. The compounds withx⩽0.5 arep-type and those withx⩾0.75 aren-type semiconductors. Magnetic hysteresis indicated that all the compounds are ferrimagnetic except forx=0 which is antiferromagnetic. The shapes of χ/χ i vsT plots, highH c values andJ R/Js ratios showed that all the compounds exceptx=0 exhibit single-domain behaviour. Curie temperature,T c increased with increasing Fe3+ ions. The probable ionic configuration for the system is suggested as Ge 1− 4+ Fe 3+ [co 2− 2+ Fe 3+ ]O 4 2− .
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