Hydrothermal preparation of the low-expansion NZP family of materials

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Abstract

This paper reports on the synthesis of low thermal expansion NaZr2(PO4)3 (NZP) and CaZr4(PO4)6 (CZP) families of materials and their analogues for each of the alkali and alkaline earth metals by the hydrothermal method. Starting gels were prepared by mixing stoichiometric proportions of alkali and alkaline earth metal chlorides of nitrates with a 0·5 m ZrOCl2 solution and by titrating this mixture with a stoichiometric amount of 1·0 m H3PO4 while the solution was constantly stirred. The gels were dried to remove the HCl produced during the reaction between ZrOCl2 and H3PO4, and were then heated with water in teflon-lined Parr bombs or gold capsules. In general, the hydrothermal method yielded 100-300 nm sized rhombohedral single crystals of different NZP materials at 175-200°C under saturated steam pressure conditions. The initial pH and the temperature of treatment are the most critical factors in the hydrothermal synthesis of these technologically important low expansion materials.

Original languageEnglish (US)
Pages (from-to)31-39
Number of pages9
JournalInternational Journal of High Technology Ceramics
Volume4
Issue number1
DOIs
StatePublished - Jan 1 1988

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Alkaline Earth Metals
Alkaline earth metals
Alkalies
Gels
Hydrothermal synthesis
Steam
Polytetrafluoroethylene
Polytetrafluoroethylenes
Gold
Nitrates
Capsules
Thermal expansion
Chlorides
Single crystals
Water
Temperature

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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abstract = "This paper reports on the synthesis of low thermal expansion NaZr2(PO4)3 (NZP) and CaZr4(PO4)6 (CZP) families of materials and their analogues for each of the alkali and alkaline earth metals by the hydrothermal method. Starting gels were prepared by mixing stoichiometric proportions of alkali and alkaline earth metal chlorides of nitrates with a 0·5 m ZrOCl2 solution and by titrating this mixture with a stoichiometric amount of 1·0 m H3PO4 while the solution was constantly stirred. The gels were dried to remove the HCl produced during the reaction between ZrOCl2 and H3PO4, and were then heated with water in teflon-lined Parr bombs or gold capsules. In general, the hydrothermal method yielded 100-300 nm sized rhombohedral single crystals of different NZP materials at 175-200°C under saturated steam pressure conditions. The initial pH and the temperature of treatment are the most critical factors in the hydrothermal synthesis of these technologically important low expansion materials.",
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Hydrothermal preparation of the low-expansion NZP family of materials. / Komarneni, Sridhar.

In: International Journal of High Technology Ceramics, Vol. 4, No. 1, 01.01.1988, p. 31-39.

Research output: Contribution to journalArticle

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