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Strength of Crystals of Small Dimensions and their Triboluminescence
Author(s) -
Chandra B. P.,
Tutakne P. R.,
Verma R. D.,
Elyas M.
Publication year - 1978
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19780130110
Subject(s) - materials science , composite material , stress intensity factor , crystal (programming language) , stress (linguistics) , hardening (computing) , crystallography , fracture mechanics , chemistry , layer (electronics) , linguistics , philosophy , computer science , programming language
Stress‐dependence of triboluminescence (TBL) in uranyl nitrate, tartaric acid and other nine crystals has been studied with the help of a new technique of crushing the crystals. As the appearance of TBL needs the creation of new surfaces in a crystal, the minimum stress at which TBL appears has been taken to be the fracture‐strength of the crystal. The value of the fracture‐strength and stress coefficient of binding energy determined from TBL measurements are found to be of correct order. It has been found that the rate of rise of TBL intensity with stress is higher for those crystals which have less value of the fracture‐strength. The fracture strength (σ f ) is found to be higher for those crystals which have less value of stress coefficient of binding energy (β) and the product of σ f and β is higher for those crystals which have higher melting point. It has been shown that the rate of rise of TBL intensity with stress decreases at higher values of stress due to strain hardening in the crystals.