Influence of Defects on Dielectric Properties of (CH3NH3)5Bi2X11 (x=Cl, Br) Crystals |
| J. Μróz, H. Pykacz Institute of Physics, Technical University of Wrocław, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland and R. Jakubas Institute of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland |
| Received: January 3, 1995; revised version: March 31, 1995 |
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| Influence of defects on ferroelectric properties of the (CH3ΝΗ3)5Bi2Χ11 (Χ = Cl, Br) crystals in the vicinity of ferro-paraelectric phase transition was investigated. γ-irradiation of both crystals insignificantly shifts Tc towards higher temperature. The substitution of chlorine atoms by iodine ones in the (CH3ΝΗ3)5Bi2Cl11 crystal drastically reduces the magnitude of the dielectric permittivity but does not influence on the temperature behaviour of the spontaneous polarization. |
| DOI: 10.12693/APhysPolA.88.369 PACS numbers: 77.70.+a |