The mixed spinel system Co_χFe_(1-χ)Cr_2S4 has been studied using the Mossbauer effect. Spectra have been collected over the temperature range 83-300K. The isomer shifts indicate that the charge states of Fe ions are ferrous in character throughout...
The mixed spinel system Co_χFe_(1-χ)Cr_2S4 has been studied using the Mossbauer effect. Spectra have been collected over the temperature range 83-300K. The isomer shifts indicate that the charge states of Fe ions are ferrous in character throughout the series. Absence of quadrupole splitting above the magnetic ordering temperature T_c suggests that iron ions occupy only tetrahedral sites. It is notable taht as the temperature decreases below T_c, both quadrupole shift and asymmmetrical linebroadening appear and increase with decreasing temperature, suggesting the presence of electric field gradient and accompanying relaxation effects.