Ferroelectric and ferroelastic properties of Rb2MnCl4.2H2O by M. Czlonkowska, Z. Tylczynski, and M. Laniecki

Crystal Research and Technology

Cryst. Res. Technol. 41, 464 (2006) - Abstract -

Ferroelectric and ferroelastic properties of Rb₂MnCl₄^.2H₂O

M. Czlonkowska, Z. Tylczynski, and M. Laniecki*

Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznañ, Poland
*Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznañ, Poland

Keywords	domain structure, phase transitions, ferroelectricity
PACS	77.80.-e, 65.40.-b, 77.22.Ch
DOI	10.1002/crat.200510606

Rb₂MnCl₄^.2H₂O crystal belonging to the family of tetrahalogeno-metallates dihydrates has been subjected to thermal, optical and dielectric studies. At room temperature the optical study under a polarization microscope has revealed a ferroelastic domain structure. At 240 K a dielectric anomaly, characteristic of the week ferroelectric phase transition, has been also observed. Moreover, below the temperatures of the phase transitions dielectric dispersion has appeared. Ferroic properties of Rb₂MnCl₄^.2H₂O crystal have been compared to those of other tetrachlorides dehydrates.

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