Discrimination of the transition order extremely close to a tricritical point

The cubic to tetragonal phase transition of the ferroelastic KMn 0.997Ca 0.003F 3 has been studied by a conduction calorimetry technique. The comparison of the specific heat data, the sensitivity of the calorimeter and the DTA trace obtained with the same apparatus and under similar thermal conditio...

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Bibliographic Details
Published in:Thermochimica acta 2001-05, Vol.372 (1), p.25-31
Main Authors: Romero, F.J, Gallardo, M.C, Jiménez, J, Cerro, J.Del
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Conduction calorimetry
Equations of state, phase equilibria, and phase transitions
Equilibrium properties near critical points, critical exponents
Exact sciences and technology
General studies of phase transitions
KMnF 3
Latent heat
Physics
Specific heat
Tricritical point
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Summary:The cubic to tetragonal phase transition of the ferroelastic KMn 0.997Ca 0.003F 3 has been studied by a conduction calorimetry technique. The comparison of the specific heat data, the sensitivity of the calorimeter and the DTA trace obtained with the same apparatus and under similar thermal conditions shows that the transition is extremely close to the tricritical point and its latent heat is evaluated to be 0.010±0.005 J g −1.
ISSN:0040-6031
1872-762X
DOI:10.1016/S0040-6031(01)00432-4