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Model Experiment on Thermodynamic Stability of Retained Intergranular Amorphous Films
Author(s) -
Ackler Harold D.,
Chiang YetMing
Publication year - 1997
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.1151-2916.1997.tb03068.x
Subject(s) - crystallization , eutectic system , materials science , amorphous solid , intergranular corrosion , crystal (programming language) , kinetic energy , substrate (aquarium) , chemical engineering , crystallography , composite material , microstructure , chemistry , physics , oceanography , quantum mechanics , computer science , engineering , geology , programming language
To test the stability of intergranular amorphous films against crystallization, a model experiment was conducted wherein a thin SiO 2 film was deposited on a single‐crystal TiO 2 substrate, annealed to form a eutectic liquid in equilibrium with the substrate, then quenched and crystallized below the eutectic temperature. This geometry is free of residual stresses and capillary effects proposed by others as kinetic limitations to complete crystallization. Furthermore, using a binary system removes solute rejection barriers to complete crystallization. A remnant amorphous film ∼1.5 nm thick retained at the hetero‐interface shows unequivocally that the amorphous film is thermodynamically preferred to a crystal/crystal interface in this system.