Thermal properties at the commensurate-incommensurate transition of K2ZnCl4
SCIE
SCOPUS
- Title
- Thermal properties at the commensurate-incommensurate transition of K2ZnCl4
- Authors
- Ahn, HY; Jeong, HT; Cho, YC; Jeong, SY; Jeong, YH
- Date Issued
- 1998-10
- Publisher
- PHYSICAL SOCIETY JAPAN
- Abstract
- The heat capacity of the K2ZnCl4 single crystal was measured between 330 K and 415 K using an adiabatic calorimeter. A distinct anomaly of the commensurate-incommensurate transition was observed at 403.64 +/- 0.05 K for the first time by the adiabatic calorimetry, where the enthalpy change is Delta H = 9.990 J . mol(-1) and the entropy change is Delta S = 0.025 J . K-1 mol(-1) . The anomaly of the heat capacity is demonstrated by the behavior of the phase soliton or the domain wall near the transition point. The heat capacity was simulated numerically by using the phenomenological Landau theory and compared with the experimental results. The anomaly of the thermal expansion near T-C measured by TMA is related with a structural phase transition accompanied by the entropy change. We discuss the influence of the anomalous change of the thermal expansion compared with the heat capacity near T-C.
- Keywords
- commensurate-incommensurate phase transition; K2ZnCl4; heat capacity; adiabatic calorimetry; thermo-mechanical analysis [TMA]; thermal expansion; Landau free energy; PHASE-TRANSITIONS; THERMODYNAMIC PROPERTIES; HEAT; K2SEO4
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/20609
- DOI
- 10.1143/JPSJ.67.3500
- ISSN
- 0031-9015
- Article Type
- Article
- Citation
- JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, vol. 67, no. 10, page. 3500 - 3504, 1998-10
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.