DOI: 10.1063/1.2794745. Molar volume, excess enthalpy, and Prigogine-Defay ratio of some silicate glasses with different (P,T) histories

Molar volume, excess enthalpy, and Prigogine-Defay ratio of some silicate glasses with different (P,T) histories

10.1063/1.2794745

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Structural relaxation in silicate glasses with different (p,T) histories was experimentally examined by differential scanning calorimetry and measurements of molar volume under ambient pressure. Temperature and pressure-dependent rates of changes in molar volume and generation of excess enthalpy were determined for sodium trisilicate, soda lime silicate, and sodium borosilicate (NBS) compositions. From the derived data, Prigogine-Defay ratios are calculated and discussed. Changes of excess enthalpy are governed mainly by changes in short-range structure, as is shown for NBS where boron coordination is highly sensitive to pressure. For all three glasses, it is shown how the relaxation functions that underlie volume, enthalpy, and structural relaxation decouple for changes in cooling rates and pressure of freezing, respectively. The magnitude of the divergence between enthalpy and volume may be related to differences in structural sensitivity to changes in the (p,V,T,t) space on different length scales. The findings suggest that the Prigogine-Defay ratio is related to the magnitude of the discussed decoupling effect.

Bibliography

Wondraczek, L., & Behrens, H. (2007). Molar volume, excess enthalpy, and Prigogine-Defay ratio of some silicate glasses with different (P,T) histories. The Journal of Chemical Physics, 127(15).

Authors 2

Lothar Wondraczek (first)
Harald Behrens (additional)

References 34 Referenced 35

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Dates

Type	When
Created	17 years, 10 months ago (Oct. 16, 2007, 6:09 p.m.)
Deposited	2 years ago (July 31, 2023, 5:52 p.m.)
Indexed	3 weeks, 3 days ago (Aug. 6, 2025, 9:35 a.m.)
Issued	17 years, 10 months ago (Oct. 16, 2007)
Published	17 years, 10 months ago (Oct. 16, 2007)
Published Online	17 years, 10 months ago (Oct. 16, 2007)
Published Print	17 years, 10 months ago (Oct. 21, 2007)

Funders 0

None

BibTeX

@article{Wondraczek_2007, title={Molar volume, excess enthalpy, and Prigogine-Defay ratio of some silicate glasses with different (P,T) histories}, volume={127}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.2794745}, DOI={10.1063/1.2794745}, number={15}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Wondraczek, Lothar and Behrens, Harald}, year={2007}, month=oct }

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