Abstract
Real examples of melting of molecular crystals indicate the possibility of their successive melting via various mesophases. We then learn microscopic models relevant to such successive meltings within the so-called mean-field treatment (the Bragg–Williams approximation). Finally, we see the possibility of the internal melting of crystals consisting of flexible molecules, the importance of which we discuss in Chap. 9.
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Notes
- 1.
Helium is omitted because of the absence of the triple point among gas, liquid, and crystal.
- 2.
Here, the word “accidental” indicates that two phases are stable in both sides of the coexistence border and that the locating the transition point requires their comparison, in contrast to an ideal second-order transition with a diverging susceptibility at the critical point.
- 3.
Observations for bulk samples implies that the tail is mainly not a surface effect but a bulk effect.
- 4.
The detailed description is necessary for some cases with \(J<0\), which is not considered in this book.
- 5.
Ordered occupation on two lattices can be imagined but does not occur in their treatment.
- 6.
Subtraction of \(\frac{1}{2}\) from \(\xi \) and \(\sigma \) appearing later yields order parameter(s), which fit the ordinary definition of order parameters; null in the disordered state and finite in the ordered state.
- 7.
Since the counterpart of the central spin is on the other lattice, the division by a factor 2 is unnecessary.
- 8.
For \(n_{\alpha \alpha }\) and \(n_{\beta \beta }\), the factor 2 coming from UD and DU pairs is cancelled by the double count by zN.
- 9.
Italic style is usually used for trans and gauche.
- 10.
Biphenyl (\(n=2\)) is omitted from the present discussion because its twist phase transition is different character from those in others as briefly discussed in Sect. 5.5.3.
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Saito, K. (2020). Melting of Molecular Crystals. In: Chemical Physics of Molecular Condensed Matter. Lecture Notes in Chemistry, vol 104. Springer, Singapore. https://doi.org/10.1007/978-981-15-9023-8_6
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