TY - JOUR
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 - http://www.scopus.com/inward/record.url?scp=0344443404&partnerID=8YFLogxK
U2 - 10.1111/j.1151-2916.2003.tb03587.x
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 -