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High-temperature X-ray powder diffractometry of the decomposition of zirconium hydroxide nitrates

Published online by Cambridge University Press:  10 January 2013

Patricia Bénard ,
Jean Paul Auffrédic  and
Daniel Louër
Patricia Bénard
Affiliation:
Laboratoire de Cristallochimie, (U.R.A. C.N.R.S. 1495), Université de Rennes I, avenue du Général Leclerc, 35042 Rennes Cédex, France
Jean Paul Auffrédic
Affiliation:
Laboratoire de Cristallochimie, (U.R.A. C.N.R.S. 1495), Université de Rennes I, avenue du Général Leclerc, 35042 Rennes Cédex, France
Daniel Louër
Affiliation:
Laboratoire de Cristallochimie, (U.R.A. C.N.R.S. 1495), Université de Rennes I, avenue du Général Leclerc, 35042 Rennes Cédex, France
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Abstract

The decomposition reactions of two zirconium hydroxide nitrates Zr(OH)2(NO3)2·(4+x)H2O and α-Zr(OH)2 (NO3)2·(1+x)H2O (0≤x≤1) have been studied by thermogravimetric analysis and high-temperature X-ray powder diffractometry (HTXRD), in nitrogen gas environment. The decomposition reaction sequences were clearly displayed by the HTXRD technique. They are different for the two precursors, except the formation of amorphous zirconia at low temperature (200 °C) and crystalline zirconia at about 390 °C. Three modifications of Zr(OH)2(NO3)2·H2O (α,β,γ) were identified. Their X-ray powder diffraction patterns were indexed by the successive dichotomy method. The unit cells are triclinic and present some parametric and volumetric similarities from each other and also with that of their precursor. Moreover, the thermal decomposition sequences of Zr(OH)2(NO3)2·(4+x)H2O and α-Zr(OH)2(NO3)2·(1+x)H2O include the formation of anhydrous oxide nitrate ZrO(NO3)2 and anhydrous hydroxide nitrate Zr(OH)2(NO3)2, respectively.

Type
Research Article
Information
Powder Diffraction , Volume 8 , Issue 1 , March 1993 , pp. 39 - 46
Copyright
Copyright © Cambridge University Press 1993

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