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Tetragonal low-temperature phase of MgCr2O4

Published online by Cambridge University Press:  05 March 2012

H. Ehrenberg,
M. Knapp,
C. Baehtz and
S. Klemme
H. Ehrenberg*
Affiliation:
Institute for Materials Science, Darmstadt University of Technology, D-64287 Darmstadt, Petersenstr. 23, Germany
M. Knapp
Affiliation:
Institute for Materials Science, Darmstadt University of Technology, D-64287 Darmstadt, Petersenstr. 23, Germany
C. Baehtz
Affiliation:
Institute for Materials Science, Darmstadt University of Technology, D-64287 Darmstadt, Petersenstr. 23, Germany
S. Klemme
Affiliation:
Institute for Mineralogy, University of Heidelberg, D-69120 Heidelberg, Im Neuenheimer Feld 236, Germany
*
a)Author to whom correspondence should be addressed; electronic mail: helmut@tu-darmstadt.de; phone: +49 6151 164391; fax: +49 6151 166023.
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Abstract

Magnesiumchromite, MgCr2O4, undergoes a structural transition from a cubic spinel structure [space group Fd3m, a=8.32768(4) Å at 16 K] into a tetragonal distorted structure [space group I41/amd, a=5.89199(5) Å, c=8.31677(8) Å at 10 K], isotypic with Hausmannite, Mn3O4. This phase transition is translationengleich and takes place very close or at the antiferromagnetic ordering temperature.

Keywords

Magnesiumchromite (MgCr2O4)translationengleich phase transitionsspinel structurehigh-resolution synchrotron powder diffractionRietveld refinement

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Type
New Diffraction Data
Information
Powder Diffraction , Volume 17 , Issue 3 , September 2002, pp. 230 - 233
Copyright
Copyright © Cambridge University Press 2002

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