Six-fold coordinated silicon at grain boundaries in sintered&agr;-Al2O3
作者:
Kenji Kaneko,
Isao Tanaka,
Masato Yoshiya,
期刊:
Applied Physics Letters
(AIP Available online 1998)
卷期:
Volume 72,
issue 2
页码: 191-193
ISSN:0003-6951
年代: 1998
DOI:10.1063/1.120681
出版商: AIP
数据来源: AIP
摘要:
High-resolution transmission electron microscopy (HRTEM) and analytical electron microscopy (AEM) have been carried out on Si-doped sintered&agr;-Al2O3.HRTEM shows that there is no amorphous phase at grain boundaries. The Si-segregated boundary is found to be much more sensitive to irradiation damage than undoped Al2O3grain boundaries. AEM with energy dispersive x-ray spectroscopy (EDS) shows the significant segregation of Si at grain boundaries, and AEM with electron energy-loss spectroscopy (EELS) reveals the existence of six-fold coordinated Si at the grain boundaries. The theoretical calculations obtained by the molecular orbital method support the data obtained by EELS. ©1998 American Institute of Physics.
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