Abstract
Co-Ga ferrite has been studied with X-ray diffraction, vibrating sample magnetometer and Mossbauer spectroscopy. The crystal structure for this system is spinel and lattice constants is in accord with Vegard's law. The Neel temperature decreases linearly with Ga concentration suggesting the superexchange interaction Co-O-Fe link is stronger than that for the Ga-O-Fe link. Atomic migration of CoGa/sub 0.1/Fe/sub 1.9/O/sub 4/ starts near 350 K and increases rapidly with increasing temperature to such a degree that 73% of the ferric ions as the A sites have moved to the B site by 700 K. The temperature dependence of the magnetic hyperfine field and magnetization of CoGa/sub 0.1/Fe/sub 1.9/O/sub 4/ is explained by the Neel theory of ferrimagnetism using three superexchange integrals: J/sub A-B/=-11.5 k/sub B/, J/sub A-A/=9.8 k/sub B/, J/sub B-B/=21.3 k/sub B/.
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