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Glass transition in an isostatically compressed calcium metaphosphate glass
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View: Figures


Image of FIG. 1.
FIG. 1.

Heat capacity of calcium metaphosphate (CMP) glass measured at ambient pressure as a function of temperature. Prior to measurement, the glass was compressed at for at and then cooled at under pressure down to . DSC measurement was performed at ambient pressure. Solid line: heat capacity data measured from the first upscan ; dashed line: data from the second upscan . DSC up- and downscan rates were .

Image of FIG. 2.
FIG. 2.

Calorimetric glass transition peaks of CMP glasses that were compressed at various pressures at for and subsequently cooled at under pressures down to the room temperature. DSC measurements were performed at ambient pressure. DSC up- and downscan rates were . Inset: an example showing determination of the apparent fictive temperature according to the enthalpy-matching method.

Image of FIG. 3.
FIG. 3.

Dependences of both the overshoot enthalpy and the corresponding entropy , respectively, on the pressure for the CMP glass. (a) and (b) . Inset (a): illustration of how to calculate .

Image of FIG. 4.
FIG. 4.

Apparent fictive temperature as a function of the pressure for the CMP glasses. Inset: illustration of the enthalpy-matching method.

Image of FIG. 5.
FIG. 5.

Comparisons of the values obtained from the first DSC upscans (filled symbols) and those obtained from the second upscans (open symbols) for various pressures . Triangle symbols: the interception method; circle symbols: the enthalpy-matching method. Dashed lines are the guides for the eyes.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Glass transition in an isostatically compressed calcium metaphosphate glass