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• W2045588465 abstract "Behavior of the mechanical properties of the elemental semiconducting chalcogenide glass a-Se was investigated using a novel thermoanalysis technique based on microhardness measurements in which the Vickers microhardness, HV(T), is monitored as a function of temperature through a phase transformation with the heating rate, r, as a parameter (the method has been termed thermomicrohardness analysis; TμHA). The experiments were carried out over a temperature range encompassing the glass transformation to examine the changes in the mechanical properties in this temperature region. It is observed that the temperature dependence of the mechanical property Vickers microhardness follows the general shape of the shear and five-second elastic moduli previously reported. It is found that an Itoh-Shishokin plot of log Hv vs. T exhibits a “hardness transition” temperature, Tg, in the glass transformation region. It is shown that the heating rate and aging dependence of Tg is very similar to the glass transition temperature behavior reported from DSC experiments. Two plausible interpretations are discussed which include the onset of viscous flow-dominated indentations in the Tg region, and the observed change in the microhardness being a possible manifestation of a relaxation process such as that of the shear modulus or the density in the Tg region. For the latter interpretation, the semilogarithmic plot of the heating rate, r, against the reciprocal of Tg indicates a Vogel-Tammann-Fulcher type of behavior for the mean structural retardation time which was found to correlate remarkably well with the viscosity-temperature data of Cukierman and Uhlmann [11] over the same temperature range indicating that the relaxation time is proportional to the viscosity: τ ∼ η." @default.
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• W2045588465 date "1989-09-01" @default.
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• W2045588465 title "Mechanical properties of the semiconducting glass a-Se in the Tg region via thermomicrohardness measurements" @default.
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• W2045588465 doi "https://doi.org/10.1016/0022-3093(89)90427-4" @default.
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