Effect of phase transformation on the densification of coprecipitated nanocrystalline indium tin oxide powders

Bong Chull Kim; Sung Min Kim; Joon Hyung Lee; Jeong Joo Kim

doi:10.1111/j.1151-2916.2002.tb00408.x

Effect of phase transformation on the densification of coprecipitated nanocrystalline indium tin oxide powders

Bong Chull Kim, Sung Min Kim, Joon Hyung Lee, Jeong Joo Kim

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49 Scopus citations

Abstract

Two kinds of nanocrystalline indium tin oxide (ITO) powders with different crystal structures - rhombohedral and cubic - were prepared using a coprecipitation process through the control of aging time of precipitates after coprecipitation. The densification characteristics of the two ITO powders were examined. During sintering the rhombohedral ITO, which is a high-pressure phase, was transformed to cubic around 900°C. The phase transformation induced coarsening of grains and many voids in the microstructure retarded densification. On the other hand the cubic ITO, which did not experience phase transformation during sintering, was well densified as the sintering temperature increased. Poor densification of the rhombohedral ITO powder is explained from the viewpoint of coarsening of grains during the phase transformation. This result shows the significance of phase transformation during sintering.

Original language	English
Pages (from-to)	2083-2088
Number of pages	6
Journal	Journal of the American Ceramic Society
Volume	85
Issue number	8
DOIs	https://doi.org/10.1111/j.1151-2916.2002.tb00408.x
State	Published - Aug 2002

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title = "Effect of phase transformation on the densification of coprecipitated nanocrystalline indium tin oxide powders",

abstract = "Two kinds of nanocrystalline indium tin oxide (ITO) powders with different crystal structures - rhombohedral and cubic - were prepared using a coprecipitation process through the control of aging time of precipitates after coprecipitation. The densification characteristics of the two ITO powders were examined. During sintering the rhombohedral ITO, which is a high-pressure phase, was transformed to cubic around 900°C. The phase transformation induced coarsening of grains and many voids in the microstructure retarded densification. On the other hand the cubic ITO, which did not experience phase transformation during sintering, was well densified as the sintering temperature increased. Poor densification of the rhombohedral ITO powder is explained from the viewpoint of coarsening of grains during the phase transformation. This result shows the significance of phase transformation during sintering.",

author = "Kim, {Bong Chull} and Kim, {Sung Min} and Lee, {Joon Hyung} and Kim, {Jeong Joo}",

year = "2002",

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T1 - Effect of phase transformation on the densification of coprecipitated nanocrystalline indium tin oxide powders

AU - Kim, Bong Chull

AU - Kim, Sung Min

AU - Lee, Joon Hyung

AU - Kim, Jeong Joo

PY - 2002/8

Y1 - 2002/8

N2 - Two kinds of nanocrystalline indium tin oxide (ITO) powders with different crystal structures - rhombohedral and cubic - were prepared using a coprecipitation process through the control of aging time of precipitates after coprecipitation. The densification characteristics of the two ITO powders were examined. During sintering the rhombohedral ITO, which is a high-pressure phase, was transformed to cubic around 900°C. The phase transformation induced coarsening of grains and many voids in the microstructure retarded densification. On the other hand the cubic ITO, which did not experience phase transformation during sintering, was well densified as the sintering temperature increased. Poor densification of the rhombohedral ITO powder is explained from the viewpoint of coarsening of grains during the phase transformation. This result shows the significance of phase transformation during sintering.

AB - Two kinds of nanocrystalline indium tin oxide (ITO) powders with different crystal structures - rhombohedral and cubic - were prepared using a coprecipitation process through the control of aging time of precipitates after coprecipitation. The densification characteristics of the two ITO powders were examined. During sintering the rhombohedral ITO, which is a high-pressure phase, was transformed to cubic around 900°C. The phase transformation induced coarsening of grains and many voids in the microstructure retarded densification. On the other hand the cubic ITO, which did not experience phase transformation during sintering, was well densified as the sintering temperature increased. Poor densification of the rhombohedral ITO powder is explained from the viewpoint of coarsening of grains during the phase transformation. This result shows the significance of phase transformation during sintering.

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Effect of phase transformation on the densification of coprecipitated nanocrystalline indium tin oxide powders

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