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Spherical Yttrium Aluminum Garnet Embedded in a Glass Matrix
Author(s) -
Nagashio Kosuke,
Kuribayashi Kazuhiko
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00459.x
Subject(s) - materials science , amorphous solid , yttrium , supercooling , nucleation , amorphous metal , composite material , diffraction , yttria stabilized zirconia , viscosity , aluminium , glass transition , mineralogy , crystallography , metallurgy , cubic zirconia , polymer , optics , thermodynamics , alloy , chemistry , oxide , ceramic , physics
Containerless processing was used to investigate the glass‐forming behavior of Al 2 O 3 –Y 2 O 3 glass. The amorphous bulk samples were obtained at compositions with 25–37.5 mol% yttria when the melt was cooled at a cooling rate of ∼250 K/s. Although small spherical particles (∼10 μm) with the same composition of the matrix were detected in the amorphous samples with 32.5–37.5 mol% yttria, the microfocus X‐ray diffraction result indicated that the small spherical particles were crystalline Y 3 Al 5 O 12 garnet (YAG), rather than being amorphous. This observation suggested that small YAG particles could not grow larger after their nucleation, because of the high viscosity at high undercooling and the high cooling rate, which would graze the nose of the continuous cooling temperature diagram of YAG.