Magnetic Properties of 3d Transition Metal Ion Substituted CdCr2S4 Spinels

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Abstract
Substituted CdCr2S4 spinels containing Ni, Co, V, and Ti were prepared for magnetic study. Substitution of In3+ for Cd2+ was used for charge compensation when divalent transition‐metal ions were substituted for Cr3+. In the spinels Cd0.8In0.2[Cr1.8Ni0.2]S4, Cd0.8In0.2[Cr1.8Co0.2]S4 and Cd0.8In0.2[Co0.2Cr1.8]Se4 the Ni2+ and Co2+ were both found (by magnetic measurements) to interact negatively (antiferromagnetically) with the Cr3+ ion. The V3+ and Ti3+ ions in CdV0.2Cr1.8S4 and CdTi0.2Cr1.8S4 appear to have no magnetic moment. The measured magnetic moments of these spinels are in excellent agreement with theoretical values based only on the moment of Cr3+. In the compound Cd0.8In0.2[Cr1.8V0.2]S4 the measurements indicated that the V2+ ion is not stable with respect to the Cr2+ ion. The resulting ionic distribution would be Cd0.8In0.2[V0.23+Cr0.22+Cr 1.63+]S4 instead of Cd0.8In0.2[V0.22+Cr1.83+] S4. Two additional compositions containing 0.1 and 0.3 mole of vanadium exhibited magnetic moments which are consistent with the formation of V3+ and Cr2+.

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