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Issue 12, 1993
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Combustion synthesis and properties of fine-particle rare-earth-metal zirconates, Ln2Zr2O7

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.

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Article type: Paper
DOI: 10.1039/JM9930301289
J. Mater. Chem., 1993,3, 1289-1294

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

    N. A. Dhas and K. C. Patil, J. Mater. Chem., 1993, 3, 1289
    DOI: 10.1039/JM9930301289

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