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Thermodynamic Parameters of Bonds in Glassy Materials from Shear Viscosity Coefficient Data
Author(s) -
Ojovan Michael I.
Publication year - 2014
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.12045
Subject(s) - thermodynamics , materials science , enthalpy , nonlinear system , shear viscosity , viscosity , nonlinear regression , experimental data , shear (geology) , entropy (arrow of time) , statistical physics , mathematics , regression analysis , statistics , physics , composite material , quantum mechanics
A simple analytical approach is proposed that provides numerical values of thermodynamic parameters of bonds (enthalpy and entropy of formation) in glassy materials from four shear viscosity coefficient data at four temperatures, two of which should be below T g and other two above T g . This method replaces complex fitting procedures for the nonlinear viscosity equations to experimental data and provides accurate data close to that obtained from fitting procedures. It can be also used for obtaining zero estimates of unknown parameters for the nonlinear least squares regression procedures.