TY - JOUR
T1 - Grain boundary bonding state and fracture energy in small amount of oxide-doped fine-grained Al2O3
AU - Takigawa, Y.
AU - Ikuhara, Y.
AU - Sakuma, T.
N1 - Funding Information:
The authors would like to express their gratitude for the financial support of the Grant-in-Aid for Scientific Research on the Priority Area “Innovation in Superplasticity” (08242103) and for Fundamental Scientific Research (09450256) from the Ministry of Education, Science and Culture, Japan. A part of this paper was also supported by Tokuyama science and technology research foundation. The useful discussions with Dr G. Pezzotti of Kyoto Institute of Technologies are acknowledged. We finally thank Topcon Co. Ltd. and JEOL Ltd. for the technical assistance of FE-TEM.
PY - 1999/5/1
Y1 - 1999/5/1
N2 - Grain boundary structure and chemical bonding state were characterized in high-purity Al2O3, 0.1 wt% MgO, 0.1 wt% Y2O3 or 0.1 wt% ZrO2-doped Al2O3. High resolution electron microscopy (HREM) and energy dispersive X-ray spectroscopy (EDS) revealed that all samples examined have single phase structure, and that doped cations segregate along grain boundaries. Electron energy loss spectroscopy (EELS) spectra taken from grain boundaries in doped Al2O3 shows slight chemical shift in comparison with those from grain interior. This result suggests that the chemical bonding state in grain boundaries changes by the segregated ions. The change in chemical bonding state seems to affect the grain boundary fracture energy of Al2O3.
AB - Grain boundary structure and chemical bonding state were characterized in high-purity Al2O3, 0.1 wt% MgO, 0.1 wt% Y2O3 or 0.1 wt% ZrO2-doped Al2O3. High resolution electron microscopy (HREM) and energy dispersive X-ray spectroscopy (EDS) revealed that all samples examined have single phase structure, and that doped cations segregate along grain boundaries. Electron energy loss spectroscopy (EELS) spectra taken from grain boundaries in doped Al2O3 shows slight chemical shift in comparison with those from grain interior. This result suggests that the chemical bonding state in grain boundaries changes by the segregated ions. The change in chemical bonding state seems to affect the grain boundary fracture energy of Al2O3.
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U2 - 10.1023/A:1004574702475
DO - 10.1023/A:1004574702475
M3 - Article
AN - SCOPUS:0033132788
VL - 34
SP - 1991
EP - 1997
JO - Journal of Materials Science
JF - Journal of Materials Science
SN - 0022-2461
IS - 9
ER -