Authors:
I. Ruiz-Larrea Universidad del País Vasco Departamento de Física Aplicada II, Ciencias Apdo. 644 48080 Bilbao Spain Apdo. 644 48080 Bilbao Spain

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A. Fraile-Rodríguez Universidad del País Vasco Departamento de Física de la Materia Condensada, Ciencias Apdo. 644 48080 Bilbao Spain Apdo. 644 48080 Bilbao Spain

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A. Arnáiz Universidad del País Vasco Departamento de Química Inorgánica, Facultad de Ciencias Apdo. 644 48080 Bilbao Spain Apdo. 644 48080 Bilbao Spain

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A. López-Echarri Universidad del País Vasco Departamento de Física de la Materia Condensada, Ciencias Apdo. 644 48080 Bilbao Spain Apdo. 644 48080 Bilbao Spain

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Abstract  

New measurements of the (N(CH3 )4 )2 MnBr4 specific heat by adiabatic calorimetry around the ferro- paraelastic phase transition shown by the crystal around 276 K are compared with previous calorimetric studies on similar tetramethylammonium bromide compounds. The thermodynamic behaviour of the tribromides and tetrabromides derivatives together with the influence on the phase transition parameters of the cation and halogen molecular substitutions are examined. The thermal relaxation experiments permit to study the behaviour of the crystals thermal conduction as a function of the temperature. Finally, the Landau theory for second order phase transitions is used to describe the thermodynamic behaviour of some of these crystals.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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