TY  - JOUR
A1  - Becker, Friedrich
T1  - Molekularthermodynamische Interpretation der Phasentrennung und der kritischen Phänomene
T1  - A Molecular Thermodynamic Approach to Phase Separation and Critical Phenomena
T2  - Zeitschrift für Naturforschung, A
N2  - As we have shown in a recent paper, the principle of competition between "statistical" and "chemical" mixing represents a molecular thermodynamic approach to all known types of phase separation. This principle is effective if the contributions of two independent spontaneous processes enter into the thermodynamic potential by which the resulting equilibrium state of the system is determined. This is equivalent with the statement that two different forms of entropy exist which are not interchangeable, and for which the law of increasing entropy independently must be valid. As "cooperativity" is introduced by this principle, critical phenomena may be described by simple equilibrium models in which only nearest-neighbour interactions are considered.
Starting from the molar Gibbs free energy GM of the most simple binary equilibrium model z = 1 with nearest-neighbour pairs, nonclassical critical-point exponents α = 0.33 of the molar heat capacity, β = 0.33 of the coexistence curve, γ = 1.33 of the isothermal compressibility, and δ = 4.33 of the critical isotherm, are derived, which are consistent with the well-known exponent in­ equalities. These non-classical critical-point exponents are independent of the chemical nature of the particles because they are obtained by applying thermodynamic arguments on the coupling constant τ, by which the contribution of "statistical mixing" to GM is weighted.
Y1  - 2014
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/74232
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-742323
SN  - 1865-7109
VL  - 32
IS  - 11
SP  - 1287
EP  - 1294
PB  - Verlag der Zeitschrift für Naturforschung
CY  - Tübingen
ER  -