Thermal Expansion of (CH3NH3)5Bi2X11 (X=Cl, Br) Crystals in the Temperature Range from 80 to 300 K |
| R. Jakubas Institute of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland P. Franqois Laboratoire de Structures et Propriétés de l'Etat Solide (U.A. No. 234), UFR de Physique, Université de Lille I, 59 655 Villeneuve d'Ascq Cedex, France and J. Lefebvre Laboratoire de Dynamique et Structures des Matériaux Moléculaires (U.A. No. 801), UFR de Physique, Université de Lille I, 59 655 Villeneuve d'Ascq Cedex, France |
| Received: September 22, 1993 |
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| Thermal expansion studies on (CH3NH3)5Bi2Cl11 and (CH3NH3)5Bi2Br11 in the temperature range 80-350 K are reported. The dilatometric measurements revealed a considerable similarity with respect to the anisotropy of dilatations of both isomorphous crystals. A diffused thermal anomaly was found around 170 K in (CH3NH3)5Bi2Cl11 crystal. |
| DOI: 10.12693/APhysPolA.85.579 PACS numbers: 64.70.Kb, 65.70.+y |