Combustion synthesis and properties of fine-particle rare-earth-metal zirconates, Ln2Zr2O7

Dhas, Arul N and Patil, Kashinath C (1993) Combustion synthesis and properties of fine-particle rare-earth-metal zirconates, Ln2Zr2O7. In: Journal of Materials Chemistry, 3 (12). pp. 1289-1294.

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Abstract

Fine-particle rare-earth-metal zirconates, Ln2Zr2O7, where Ln = La, Ce, Pr, Nd, Sm, Gd and Dy having the pyrochlore structure have been prepared using a novel combustion process. The process employs aqueous solutions of the corresponding rare-earth-metal nitrate, zirconium nitrate and carbohydrazide/urea in the required molar ratio. When the solution is rapidly heated to 350–500 °C it boils, foams and burns autocatalytically to yield voluminous oxides. The formation of single-phase Ln2Zr2O7 has been confirmed by powder X-ray diffraction, infrared and fluorescence spectroscopy. The solid combustion products are fine, having surface areas in the range 6–20 m2 g–1. The cold-pressed Pr2Zr2O7 compact when sintered at 1500 °C, 4 h in air, achieved 99% theoretical density.

Item Type:	Journal Article
Publication:	Journal of Materials Chemistry
Publisher:	Royal Society of Chemistry
Additional Information:	Copyright of this article belongs to Royal Society of Chemistry.
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	02 Feb 2011 10:13
Last Modified:	02 Feb 2011 10:13
URI:	http://eprints.iisc.ac.in/id/eprint/35367

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