Combustion synthesis and properties of fine-particle rare-earth-metal zirconates, Ln2Zr2O7
Fine-particle rare-earth-metal zirconates, Ln2Zr2O7, where Ln = La, Ce, Pr, Nd, Sm, Gd and Dy having the pyrochlore structure were prepared using a novel combustion process. The process employs aqueous solutions of the corresponding rare-earth-metal nitrate, zirconium nitrate and carbohydrazide/urea...
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Published in | Journal of materials chemistry Vol. 3; no. 12; pp. 1289 - 1294 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Cambridge
Royal Society of Chemistry
1993
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Subjects | |
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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 were 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 was confirmed by powder XRD, infrared and fluorescence spectroscopy. The solid combustion products are fine, having surface areas in the range 6-20 m2/g. The cold pressed Pr2Zr2O7 compact, when sintered at 1500 C, 4 h in air, achieved 99% theoretical density. 24 refs. |
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AbstractList | Fine-particle rare-earth-metal zirconates, Ln2Zr2O7, where Ln = La, Ce, Pr, Nd, Sm, Gd and Dy having the pyrochlore structure were 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 was confirmed by powder XRD, infrared and fluorescence spectroscopy. The solid combustion products are fine, having surface areas in the range 6-20 m2/g. The cold pressed Pr2Zr2O7 compact, when sintered at 1500 C, 4 h in air, achieved 99% theoretical density. 24 refs. |
Author | ARUL DHAS, N PATIL, K. C |
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Keywords | Ternary compound Fluorescence spectrum Scanning electron microscopy Particle size Transition metal Compounds Combustion X ray diffraction Fine particle Preparation Zirconates Zirconium Oxides Infrared spectrum Lanthanide Oxides |
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