Solgel processing and crystallization of yttrium aluminosilicates

James C. Walck; Carlo G. Pantano

doi:10.1016/0022-3093(90)90257-M

Solgel processing and crystallization of yttrium aluminosilicates

James C. Walck, Carlo G. Pantano

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Abstract

Glass in the yttria-alumina-silica system was synthesized using solgel techniques. Crystallization behavior of the gel and the glass was examined using variable heating rate data obtained by differential thermal analysis (DTA). The reaction rate constants for crystallization followed an Arrhenius temperature dependence, and the activation energies for crystallization were readily determined. Surface nucleation/crystallization dominated but no appreciable difference in crystallization between the gel and glass powders was evident. It was verified that, in this system, densification of the gel occurred before the onset of crystallization. Isothermal heat treatment of the gels and glasses produced 3Al₂O₃·2SiO₂ and various polymorphs of Y₂O₃·2SiO₂.

Original language	English (US)
Pages (from-to)	145-154
Number of pages	10
Journal	Journal of Non-Crystalline Solids
Volume	124
Issue number	2-3
DOIs	https://doi.org/10.1016/0022-3093(90)90257-M
State	Published - Oct 1990

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

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10.1016/0022-3093(90)90257-M

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title = "Solgel processing and crystallization of yttrium aluminosilicates",

abstract = "Glass in the yttria-alumina-silica system was synthesized using solgel techniques. Crystallization behavior of the gel and the glass was examined using variable heating rate data obtained by differential thermal analysis (DTA). The reaction rate constants for crystallization followed an Arrhenius temperature dependence, and the activation energies for crystallization were readily determined. Surface nucleation/crystallization dominated but no appreciable difference in crystallization between the gel and glass powders was evident. It was verified that, in this system, densification of the gel occurred before the onset of crystallization. Isothermal heat treatment of the gels and glasses produced 3Al2O3·2SiO2 and various polymorphs of Y2O3·2SiO2.",

author = "Walck, {James C.} and Pantano, {Carlo G.}",

note = "Funding Information: The authors gratefully acknowledge the support of the Office of Naval Research (N00014-87-K-",

year = "1990",

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doi = "10.1016/0022-3093(90)90257-M",

language = "English (US)",

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T1 - Solgel processing and crystallization of yttrium aluminosilicates

AU - Walck, James C.

AU - Pantano, Carlo G.

N1 - Funding Information: The authors gratefully acknowledge the support of the Office of Naval Research (N00014-87-K-

PY - 1990/10

Y1 - 1990/10

N2 - Glass in the yttria-alumina-silica system was synthesized using solgel techniques. Crystallization behavior of the gel and the glass was examined using variable heating rate data obtained by differential thermal analysis (DTA). The reaction rate constants for crystallization followed an Arrhenius temperature dependence, and the activation energies for crystallization were readily determined. Surface nucleation/crystallization dominated but no appreciable difference in crystallization between the gel and glass powders was evident. It was verified that, in this system, densification of the gel occurred before the onset of crystallization. Isothermal heat treatment of the gels and glasses produced 3Al2O3·2SiO2 and various polymorphs of Y2O3·2SiO2.

AB - Glass in the yttria-alumina-silica system was synthesized using solgel techniques. Crystallization behavior of the gel and the glass was examined using variable heating rate data obtained by differential thermal analysis (DTA). The reaction rate constants for crystallization followed an Arrhenius temperature dependence, and the activation energies for crystallization were readily determined. Surface nucleation/crystallization dominated but no appreciable difference in crystallization between the gel and glass powders was evident. It was verified that, in this system, densification of the gel occurred before the onset of crystallization. Isothermal heat treatment of the gels and glasses produced 3Al2O3·2SiO2 and various polymorphs of Y2O3·2SiO2.

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JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

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ER -

Solgel processing and crystallization of yttrium aluminosilicates

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