Abstract
X-ray, electrical conductivity and IR studies for the system Zn1−x Ni x FeCrO4 were carried out. All the compounds, 0 ⩽x ⩽ 1 showed cubic symmetry. X-ray intensity calculations and IR studies indicate the presence of Zn2+ at tetrahedral sites, Ni2+ and Cr3+ at octahedral sites, and Fe3+ ions are equally distributed at both the sites. Activation energy and thermoelectric coefficient decreases with the increasing values ofX. All the compounds exhibit P-type semiconductivity which may be due to transfer of Fe3+ ions from B-site to A-site creating holes. The electrical resistivity temperature behaviour obeys the relationϱ=ϱ 0 exp (ΔE/KT). The mobility of holes as calculated from IR and conductivity data is of the order of 10−9 cm2 V sec−1. The probable ionic configuration for the system is suggested to be Zn 1− 2+ Fe 3+ [Fe 1− 3+ Ni 2+ Cr3+] O 4 2− .
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