Ordering Phase Transition with Symmetry-Breaking from Disorder over Non-Equivalent Sites: Calorimetric and Crystallographic Study of Crystalline d-Sorbose
by
Sakiko Iwagaki 1, Hiroki Kakuta 2, Yasuhisa Yamamura 1
, Hideki Saitoh 2, Mafumi Hishida 1, Kazuhiro Fukada 3 and Kazuya Saito 1,*
Sakiko Iwagaki 1, Hiroki Kakuta 2, Yasuhisa Yamamura 1, Hideki Saitoh 2, Mafumi Hishida 1, Kazuhiro Fukada 3 and Kazuya Saito 1,*
1
Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
2
Department of Chemistry, Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan
3
Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki-cho 761-0795, Japan
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(5), 361; https://doi.org/10.3390/cryst10050361
Received: 19 March 2020 / Revised: 21 April 2020 / Accepted: 22 April 2020 / Published: 1 May 2020
(This article belongs to the Special Issue Molecular Dynamics and Phase Transition)
Phase transitions in the crystalline state of chiral sorbose were examined using precise heat capacity calorimetry and X-ray crystallography. The calorimetry established heat capacity below room temperature. Besides the known transition (main transition) at 199.5 K, the calorimetry detected plural thermal anomalies assignable to new phase transitions (around 210 K) and a glass transition (at ca. 120 K). The X-ray diffraction at low temperatures established the crystal structure of the lowest temperature phase. The identification of the broken symmetry upon the main transition solves an apparent contradiction that the structural disorder reported previously does not contribute seemingly to the symmetrization.
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Keywords:
structural phase transition; order-disorder transition; symmetry-breaking; calorimetry; entropy of transition
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MDPI and ACS Style
Iwagaki, S.; Kakuta, H.; Yamamura, Y.; Saitoh, H.; Hishida, M.; Fukada, K.; Saito, K. Ordering Phase Transition with Symmetry-Breaking from Disorder over Non-Equivalent Sites: Calorimetric and Crystallographic Study of Crystalline d-Sorbose. Crystals 2020, 10, 361.
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