Spinel to CaFe2O4 Transformation: Mechanism and Properties of β-CdCr2O4
Ángel M. Arévalo‐LópezAntonio J. Dos santos‐GarcíaElizabeth Castillo‐MartínezAlejandro DuránM.Á. Alario-Franco
Abstract
The CdCr(2)O(4) spinel transforms to a 10.6% denser new polymorph of the CaFe(2)O(4)-type structure at 10 GPa and 1100 degrees C. This new polymorph has a honeycomb-like structure because of double rutile-type chains formed by [Cr-O(6)] edge-shared octehedra. This crystal structure is prone to be magnetically frustrated and presents low-dimensional antiferromagnetism at 25 K < T < 150 K, accompanied by more complex interactions as the temperature decreases. These transitions are evidenced by magnetic susceptibility and heat capacity measurements. We also discuss a possible structural mechanism for the transformation.
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