Sol-gel synthesis of phosphate ceramic composites I

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Journal of Materials Research

DOI:https://doi.org/10.1557/JMR.1996.0017· OSTI ID:285347

Lee, B I ^[1]; Samuels, W D; Wang, L; Exarhos, G J ^[2]

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1. Department of Ceramic Engineering, Clemson University, Clemson, South Carolina 29634-0907 (United States)
2. Battelle Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352 (United States)

Monolithic gels of phosphate ceramics were synthesized using PO(OH){sub 3{minus}{ital x}}(OR){sub {ital x}} and alkoxides of silicon and titanium. The PO(OH){sub 3{minus}{ital x}}(OR){sub {ital x}} species were synthesized from the reaction of P{sub 2}O{sub 5} and ethanol or {ital 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 {percent}, the gels were completely crystallized upon firing at temperatures above 700{degree}C, while the gels containing zinc and alkali metals remained amorphous after firing at 850{degree}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 temperature above 520{degree}C. {copyright} {ital 1996 Materials Research Society.}

• Research Organization: Pacific Northwest National Laboratory
• DOE Contract Number: AC06-76RL01830; FG06-89ER75522
• OSTI ID: 285347
• Journal Information: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 1 Vol. 11; ISSN JMREEE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COORDINATION NUMBER
MECHANICAL PROPERTIES
MICROSTRUCTURE
SILICON PHOSPHATES
SOL-GEL PROCESS
SYNTHESIS
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K