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Stress‐induced crystal axis spiral rotation in multiferroic β'‐Gd 2 (MoO 4 ) 3 observed only in glass crystallization
Author(s) -
Komatsu Takayuki,
Honma Tsuyoshi
Publication year - 2021
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/ijag.15860
Subject(s) - materials science , crystallization , crystal (programming language) , multiferroics , crystallography , birefringence , stress (linguistics) , condensed matter physics , crystal growth , ferroelectricity , optics , dielectric , thermodynamics , optoelectronics , chemistry , physics , linguistics , philosophy , computer science , programming language
Stress‐induced crystal axis spiral rotation in multiferroic β'‐Gd 2 (MoO 4 ) 3 crystals observed only in the crystallization of Gd 2 O 3 ‐MoO 3 ‐B 2 O 3 glasses is a new world of glass‐crystallization being beyond the usual crystal growth engineering. The self‐powdering phenomenon in crystals synthesized in an electric furnace and the appearance of periodic birefringence images observed in laser‐patterned single crystal lines are reviewed together with some new data. Extremely large stresses are created at the interface between super‐cooled liquids and crystals due to the density difference between glasses/liquids with larger density and crystals with smaller density, and the crystal axis spiral rotation is induced in β'‐Gd 2 (MoO 4 ) 3 crystals in order to relax and release stresses at the interface. The structural origin of the density difference between glasses and crystals is discussed, and the uniqueness of the crystallization of Gd 2 O 3 ‐MoO 3 ‐B 2 O 3 glasses is emphasized. The possibility of the synthesis of dense bulk glass‐ceramics with β'‐Gd 2 (MoO 4 ) 3 crystals is tried using a slow melt‐cooling processing.