The systems NixFe1−xCr2O4, CuxNi1−xCr2O4, and CuxCo1−xCr2O4 have been prepared and their crystallographic properties studied. From consideration of Jahn-Teller effects, it was shown that A-site Cu2+ is more effective than A-site Fe2+ in stabilizing a tetragonal (c/a<1) distortion at A-site Ni2+. In addition considerably more Cu2+ is required on the A site to distort CoCr2O4 from cubic symmetry to c/a<1 than is required to change the distortion of NiCr2O4 from c/a>1 to c/a<1.
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Wold et al. (1963) studied this question.
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