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Preparation and physical properties of the spinel Ti and V oxides

✍ Scribed by Y. Nakajima; Y. Amamiya; K. Ohnishi; I. Terasaki; A. Maeda; K. Uchinokura


Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
145 KB
Volume
185-189
Category
Article
ISSN
0921-4534

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The compounds CuCr 2 O 4 and NiCr 2 O 4 crystallize at room temperature in a tetragonal distorted spinel structure, s.g. I4 1 /amd, with axes ratio c/ao1 and 41, respectively. The distortion is caused by the Jahn-Teller ions Cu 2+ and Ni 2+ which flatten or elongate their surrounding oxygen tetrahed