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Stress‐Induced Phase Transformation in the Systems (Ho 1−x La x ) 4 Al 2 O 9 and (Y 1−x La x ) 4 Al 2 O 9
Author(s) -
Takizawa Hirotsugu,
Shimad Masahiko,
Shimoyashiki Kazuo,
Endo Tadashi
Publication year - 1994
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.1151-2916.1994.tb04630.x
Subject(s) - orthorhombic crystal system , monoclinic crystal system , phase (matter) , materials science , crystallography , x ray crystallography , sintering , crystal structure , diffraction , chemistry , metallurgy , physics , optics , organic chemistry
New orthorhombic phases in (Ho 1−x La x ) 4 Al 2 O 9 and (Y 1−x La x ) 4 Al 2 O 9 systems have been synthesized by reaction sintering at 1600°C for 30 h in air and have been metastably retained to room temperature. Stress‐induced phase transformation from the orthorhombic phase to the monoclinic phase occurred in both systems. This phase transformation was accompanied by a 0.5% volume increase.