Prigogine-Defay ratio of glassy freezing scales with liquid fragility.
basic_science · Level V
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- Record sourced from PubMed, PMID 40247531.
- Also identified by DOI 10.1103/PhysRevE.111.035407.
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Abstract
A detailed study of published experimental data for a variety of materials on the incremental variation of heat capacity, thermal expansion, and compressibility at glassy freezing reveals a striking dependence of the Prigogine-Defay ratio R on the fragility index m. At high m, R approaches values of ∼1, the Ehrenfest expectation for second-order continuous phase transitions, while R reaches values >20 for low fragilities. We explain this correlation by the degree of separation of the glassy freezing temperature from a hidden phase transition into an ideal low-temperature glass.