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A temperature-dependent powder diffraction study of chromium lanthanum nitrate, LaCr(NO3)6·12H2O

Published online by Cambridge University Press:  10 January 2013

A.-E. Gobichon ,
J.-P. Auffrédic  and
D. Louër
A.-E. Gobichon
Affiliation:
Laboratoire de Chimie du Solide et Inorganique Moléculaire (U.M.R. C.N.R.S. 6511), Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes cedex, France
J.-P. Auffrédic
Affiliation:
Laboratoire de Chimie du Solide et Inorganique Moléculaire (U.M.R. C.N.R.S. 6511), Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes cedex, France
D. Louër
Affiliation:
Laboratoire de Chimie du Solide et Inorganique Moléculaire (U.M.R. C.N.R.S. 6511), Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes cedex, France
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Abstract

The new phase LaCr(NO3)6·12H2O was synthesized from a nitric acid solution. The symmetry is trigonal with the parameters a=10.9564(4) Å and c=16.835(1) Å [V=1750.2(2) Å3, space group R-3]. The thermal decomposition, studied by temperature-dependent X-ray powder diffraction and thermogravimetry, gave successively the cubic phase LaCr(NO3)6·6H2O [a=12.301(1) Å, space group P213] and the chromate(V) LaCrO4. The reduction of LaCrO4 to LaCrO3 occurred at a temperature depending on the oxygen pressure in the reaction atmosphere.

Type
Technical Articles
Information
Powder Diffraction , Volume 15 , Issue 1 , March 2000 , pp. 23 - 25
Copyright
Copyright © Cambridge University Press 2000

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