Abstract
AS is well known, geometrical interpretations of Λ-type thermal transitions have been proposed on the assumption that, in a transition of the first order, the G = f(p,V,T) surfaces intersect at a finite angle; for transitions of the second and higher orders, the G = f(p,V,T) surfaces make contact. Contacts of the first order, second order, etc., are held to correspond with thermal transitions of the second order, third order, etc.1. Although this interpretation permits a formal representation of Λ-type transitions in terms of geometrical relationships between the free-energy functions G1 above and G2 below the transition point, it is not easy to correlate with structural changes accompanying these transitions.
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References
cf. References in Jaffray, J., Ann. Phys., 3, 5 (1948).
Ubbelohde, A. R., Proc. Roy. Soc., A, 159, 301 (1937).
Dinochert, Helv. Phys. Acta, 17, 388 (1944).
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UBBELOHDE, A. Geometrical Representation of Thermal Transitions of Higher Order. Nature 169, 832 (1952). https://doi.org/10.1038/169832a0
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DOI: https://doi.org/10.1038/169832a0
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