Spinel to CaFe2O4 Transformation: Mechanism and Properties of β-CdCr2O4

The CdCr2O4 spinel transforms to a 10.6% denser new polymorph of the CaFe2O4-type structure at 10 GPa and 1100 °C. This new polymorph has a honeycomb-like structure because of double rutile-type chains formed by [Cr−O6] edge-shared octehedra. This crystal structure is prone to be magnetically frustr...

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Published inInorganic chemistry Vol. 49; no. 6; pp. 2827 - 2833
Main Authors Arévalo-López, Ángel M, Dos santos-García, Antonio J, Castillo-Martínez, Elizabeth, Durán, Alejandro, Alario-Franco, Miguel Á
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 15.03.2010
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Summary:The CdCr2O4 spinel transforms to a 10.6% denser new polymorph of the CaFe2O4-type structure at 10 GPa and 1100 °C. This new polymorph has a honeycomb-like structure because of double rutile-type chains formed by [Cr−O6] 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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ISSN:0020-1669
1520-510X
DOI:10.1021/ic902228h