Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 69: Issue 3
Orientational ordering of pyridinium ion in its tetrabromoaurate(III) salt
Authors:
H. Fujimori Nihon University Department of Chemistry, College of Humanities and Sciences Sakurajosui, Setagaya-ku, Tokyo 156-8550 Japan Sakurajosui, Setagaya-ku, Tokyo 156-8550 Japan

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M. Hanaya Gunma University Department of Materials Chemistry, Faculty of Engineering Tenjin-cho 1-5-1 Kiryu, Gunma 376-8515 Japan Tenjin-cho 1-5-1 Kiryu, Gunma 376-8515 Japan

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M. Oguni Tokyo Institute of Technology Department of Chemistry, Graduate School of Science and Engineering Ookayama, Meguro-ku, Tokyo 152-8551 Japan Ookayama, Meguro-ku, Tokyo 152-8551 Japan

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Pages:
985–996
Online Publication Date:
02 Nov 2004
Publication Date:
01 Jul 2002
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1020640930186
Keywords:
phase transition; pyridinium tetrabromoaurate(III); cooperative effect; heat capacity; Schottky effect; pyridinium ion; glass transition; dielectric constant
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Abstract  

Heat capacity and dielectric measurements of crystalline pyridinium tetrabromoaurate(III), (pyH)AuBr4, were carried out in the temperature ranges of 13 to 300 K and 30 to 160 K, respectively. A phase transition, due to the orientational ordering of pyridinium ions, was found at 99.9 K. A glass transition, due to freezing-in of the reorientational motion of pyridinium ions, was found at around 60 K. An anomaly showing the intermediate situation between Schottky effect and phase transition was found with the heat-capacity peak at around 260 K.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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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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