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Revealing Structural Relaxation of Optical Glass Through the Temperature Dependence of Young's Modulus
Author(s) -
Liu Weidong,
Ruan Haihui,
Zhang Liangchi
Publication year - 2014
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/jace.13179
Subject(s) - modulus , thermal expansion , materials science , relaxation (psychology) , thermoforming , glass transition , young's modulus , impulse (physics) , thermal , thermodynamics , composite material , physics , psychology , social psychology , quantum mechanics , polymer
Structural relaxation is one of the most important features of a glass material at an elevated temperature. This study aims to obtain an insight into the structural relaxation process of a typical optical glass. Experimentally, a high‐temperature impulse excitation technique was used to explore the mechanism through monitoring the variation of the Young's modulus of the material. Theoretically, the Tool–Narayanaswamy–Moynihan ( TNM ) model was employed to describe the variation of modulus with time and temperature. It was found that the parameterized TNM model obtained by modulus data could be used to achieve a more subtle description of the variation of coefficient of thermal expansion during structural relaxation, which is vital for thermoforming a glass product.