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Sol-gel synthesis of phosphate ceramic composites I

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Abstract

Monolithic gels of phosphate ceramics were synthesized using PO(OH)3−x(OR)x and alkoxides of silicon and titanium. The PO(OH)3−x(OR)x species were synthesized from the reaction of P2O5 and ethanol or n-butanol, and the products consisted of approximately equal molar amounts of mono- and dialkyl phosphate. The phosphate gels containing titanium lost less phosphorus than from the gels of silicon/phosphorus upon firing of gels in air. At phosphorus contents above 60 mole %, the gels were completely crystallized upon firing at temperatures above 700 °C, while the gels containing zinc and alkali metals remained amorphous after firing at 850 °C. Solid state nuclear magnetic resonance spectroscopy showed that all of the silicon is hexacoordinated in the phosphate gels containing silicon and titanium upon firing at temperatures above 520 °C

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Authors and Affiliations

  1. Department of Ceramic Engineering, Clemson University, Clemson, South Carolina, 29634-0907, USA

    Burtrand I. Lee

  2. Battelle Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington, 99352, USA

    William D. Samuels, Li-Qiong Wang & Gregory J. Exarhos

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  1. Burtrand I. Lee
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  2. William D. Samuels
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  3. Li-Qiong Wang
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  4. Gregory J. Exarhos
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Lee, B.I., Samuels, W.D., Wang, LQ. et al. Sol-gel synthesis of phosphate ceramic composites I. Journal of Materials Research 11, 134–143 (1996). https://doi.org/10.1557/JMR.1996.0017

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  • DOI: https://doi.org/10.1557/JMR.1996.0017

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