Ferroelastic Phase Transition in a Layered Bismuth Oxychloride Single Crystals

V. Bundaa, S. Bundaa, F. Vashchuka, A. Feherb, M. Kajňakováb, J. Kováčc and E. Syrkind aFaculty of Information Sciences, Transcarpathian State University, Zankovetska St. 89-A, Uzhgorod 88 015, Ukraine bCenter of Low Temperature Physics, Faculty of Science, P.J. Šafarik University, Park Angelinum 9, 04154 Kosice, Slovakia cInstitute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, Kosice, Slovakia dVerkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov, Ukraine

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We report the results of low-temperature specific-heat, magnetization, and X-ray diffraction measurements on a bismuth oxyhalide (BiOCl) single crystal. We conclude that BiOCl in temperature region 150-230 K shows "antiferroelastic-paraelectric" phase transitions at critical temperatures Tc1 = 167.5 K and Tc2 = 214.6 K, respectively.

DOI: 10.12693/APhysPolA.118.1069 PACS numbers: 64.70.K-, 81.30.-t, 65.40.-b