Evidence of Bilevel Solubility in the Bimodal Microstructure of TiO 2-Doped Alumina

Miaofang Chi; Hui Gu; Xin Wang; Peiling Wang

doi:10.1111/j.1151-2916.2003.tb03587.x

Evidence of Bilevel Solubility in the Bimodal Microstructure of TiO ₂-Doped Alumina

Miaofang Chi
, Hui Gu
, Xin Wang
, Peiling Wang

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

A phenomenon of bilevel solubility was observed in a TiO₂-doped (2.0 wt%) alumina with bimodal microstructure sintered in N₂. Surface contributions to dopant signals in individual grains were identified and removed, using a spatially resolved energy dispersive spectroscopy analysis. Two levels of solubility, 1.005 ± 0.166 and 0.504 ± 0.082 mol% of TiO₂ in A1₂O₃, were obtained for anisotropic and equiaxed grains, respectively. No grain size dependence of solubility was found, but segregation of SiO₂ to boundaries with the anisotropic grains was observed. This phenomenon was explained by the incorporation of Ti³⁺ into the A1₂O₃ lattice during the abnormal grain growth caused by SiO₂ liquid under a reducing atmosphere.

Original language	English
Pages (from-to)	1953-1955
Number of pages	3
Journal	Journal of the American Ceramic Society
Volume	86
Issue number	11
DOIs	https://doi.org/10.1111/j.1151-2916.2003.tb03587.x
State	Published - Nov 2003
Externally published	Yes

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title = "Evidence of Bilevel Solubility in the Bimodal Microstructure of TiO 2-Doped Alumina",

abstract = "A phenomenon of bilevel solubility was observed in a TiO2-doped (2.0 wt\%) alumina with bimodal microstructure sintered in N2. Surface contributions to dopant signals in individual grains were identified and removed, using a spatially resolved energy dispersive spectroscopy analysis. Two levels of solubility, 1.005 ± 0.166 and 0.504 ± 0.082 mol\% of TiO2 in A12O3, were obtained for anisotropic and equiaxed grains, respectively. No grain size dependence of solubility was found, but segregation of SiO2 to boundaries with the anisotropic grains was observed. This phenomenon was explained by the incorporation of Ti3+ into the A12O3 lattice during the abnormal grain growth caused by SiO2 liquid under a reducing atmosphere.",

author = "Miaofang Chi and Hui Gu and Xin Wang and Peiling Wang",

year = "2003",

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doi = "10.1111/j.1151-2916.2003.tb03587.x",

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journal = "Journal of the American Ceramic Society",

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T1 - Evidence of Bilevel Solubility in the Bimodal Microstructure of TiO 2-Doped Alumina

AU - Chi, Miaofang

AU - Gu, Hui

AU - Wang, Xin

AU - Wang, Peiling

PY - 2003/11

Y1 - 2003/11

N2 - A phenomenon of bilevel solubility was observed in a TiO2-doped (2.0 wt%) alumina with bimodal microstructure sintered in N2. Surface contributions to dopant signals in individual grains were identified and removed, using a spatially resolved energy dispersive spectroscopy analysis. Two levels of solubility, 1.005 ± 0.166 and 0.504 ± 0.082 mol% of TiO2 in A12O3, were obtained for anisotropic and equiaxed grains, respectively. No grain size dependence of solubility was found, but segregation of SiO2 to boundaries with the anisotropic grains was observed. This phenomenon was explained by the incorporation of Ti3+ into the A12O3 lattice during the abnormal grain growth caused by SiO2 liquid under a reducing atmosphere.

AB - A phenomenon of bilevel solubility was observed in a TiO2-doped (2.0 wt%) alumina with bimodal microstructure sintered in N2. Surface contributions to dopant signals in individual grains were identified and removed, using a spatially resolved energy dispersive spectroscopy analysis. Two levels of solubility, 1.005 ± 0.166 and 0.504 ± 0.082 mol% of TiO2 in A12O3, were obtained for anisotropic and equiaxed grains, respectively. No grain size dependence of solubility was found, but segregation of SiO2 to boundaries with the anisotropic grains was observed. This phenomenon was explained by the incorporation of Ti3+ into the A12O3 lattice during the abnormal grain growth caused by SiO2 liquid under a reducing atmosphere.

UR - https://www.scopus.com/pages/publications/0344443404

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DO - 10.1111/j.1151-2916.2003.tb03587.x

M3 - Article

AN - SCOPUS:0344443404

SN - 0002-7820

VL - 86

SP - 1953

EP - 1955

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

IS - 11

ER -

Evidence of Bilevel Solubility in the Bimodal Microstructure of TiO ₂-Doped Alumina

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