Effect of composition on the oxygen tracer diffusion in transparent yttrium aluminium garnet (YAG) ceramics

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08774.x· OSTI ID:271675

Sakaguchi, Isao; Haneda, Hajime; Tanaka, Junzo ^[1]; Yanagitani, Takakimi ^[2]

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1. National Inst. for Research in Inorganic Materials, Ibaraki (Japan)
2. Kounoshima Chemical Co., Ltd., Kagawa (Japan). Takuma Works

The grain boundary structure and oxygen tracer diffusion in transparent yttrium aluminum garnet (YAG) ceramics varying from 2% excess of Y{sub 2}O{sub 3} to 0.5% excess of Al{sub 2}O{sub 3} were studied. The characterization of the specimens is as follows: (1) For the Y{sub 2}O{sub 3}-excess specimen, a second phase (yttrium aluminum perovskite: YAP) containing silicon in the grain boundary was found. (2) For the Al{sub 2}O{sub 3}-excess specimen, both aluminum-rich particles (alumina) and a silicon-rich segregant layer were observed in the grain boundary. The volume diffusion of the oxygen tracer is little influenced by the excess composition. In contrast, the grain boundary diffusion of the oxygen tracer is suppressed in the Y{sub 2}O{sub 3}-excess specimens, compared to Al{sub 2}O{sub 3}-excess specimens. These differences are thought to result from the chemical reaction between the second phase and the intergranular liquid phase during the sintering.

• Sponsoring Organization: USDOE
• OSTI ID: 271675
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 6 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

07 ISOTOPE AND RADIATION SOURCES
36 MATERIALS SCIENCE
42 ENGINEERING
ALUMINIUM OXIDES
ATOM TRANSPORT
CHEMICAL COMPOSITION
DIFFUSION
DOPED MATERIALS
FERRITE GARNETS
GRAIN BOUNDARIES
ION MICROPROBE ANALYSIS
ISOTOPIC EXCHANGE
LASER MATERIALS
MASS SPECTROSCOPY
MORPHOLOGY
OPTICAL MICROSCOPY
OXYGEN 18
PEROVSKITES
POWDERS
PRECIPITATION
SILICON
SINTERING
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY SPECTROSCOPY
YTTRIUM COMPOUNDS