Orientational ordering of pyridinium ion in its tetrabromoaurate(III) salt |
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| Authors: | Fujimori H Hanaya M Oguni M |
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| Institution: | (1) Department of Chemistry, College of Humanities and Sciences, Nihon University, Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan;(2) Department of Materials Chemistry, Faculty of Engineering, Gunma University, Tenjin-cho 1-5-1, Kiryu, Gunma 376-8515, Japan;(3) Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8551, Japan |
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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.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | phase transition pyridinium tetrabromoaurate(III) cooperative effect heat capacity Schottky effect pyridinium ion glass transition dielectric constant |
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