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

Hirotsugu Takizawa; Masahiko Shimad; Kazuo Shimoyashiki; Tadashi Endo

doi:10.1111/j.1151-2916.1994.tb04630.x

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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

Hirotsugu Takizawa Masahiko Shimad Kazuo Shimoyashiki Tadashi Endo

Year: 1994 Journal: Journal of the American Ceramic Society Vol: 77 (9)Pages: 2489-2490 Publisher: Wiley

DOI: 10.1111/j.1151-2916.1994.tb04630.x

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Abstract

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.

Keywords:

Orthorhombic crystal system Monoclinic crystal system Phase (matter) Materials science Crystallography X-ray crystallography Sintering Crystal structure Diffraction Chemistry Metallurgy Physics Optics

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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

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