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Phenomenological analysis of the phase transitions sequence in the ferroelectric crystal (CH3NH3)5Bi2Cl11 (PMACB)

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Zeitschrift für Physik B Condensed Matter

Abstract

A phenomenological model is proposed to describe the sequence of phase transitions in Pentakis (methylammonium) Undecachlorodibismuthate (111), (CH3NH3)5Bi2Cl11 (PMACB) crystal on the basis of the recent structural data. The ferroelectric phase transition at 307 K is attributed to the ordering in a sublattice of the methylammonium cations CH3NH +3 } placed in centrosymmetric sites in the paraelectric phase, whereas the isomorphous anomaly at about 180 K is related to a variation of the order in the sublattice of the remaining CH3NH +3 } cations. The phenomenological thermodynamic potential is constructed for this system of two nonequivalent sublattices and the numerical values of its coefficients are then estimated from the dielectric, pyroelectric and calorimetric data. The sublattices are found to be weakly coupled near the ferroelectric phase transition. The anomaly at 180 K is interpreted as a continuous trace of a first order phase transition in a field created by the cations already ordered in the ferroelectric phase transition. This is analogous to a cusp A+3 in the catastrophes theory. The comparison of the Curie constants with the saturation values of the spontaneous polarization suggests that the sublattices cannot be treated as consisting of simple two-states pseudospins.

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Author notes

  1. P. Zieliński

    Present address: H. Niewodniczański Institute of Nuclear Physics, ul. Radzikowskiego 152, PL-31-342, Kraków, Poland

Authors and Affiliations

  1. Laboratoire de Dynamique et Structures des Matériaux Moléculaires (C.N.R.S., U.R.A. 801), U.F.R. de Physique, University de Lille I, F-59655, Villeneuve d'Ascq Cedex, France

    P. Carpentier, P. Zieliński & J. Lefebvre

  2. Institute of Chemistry University of Wroclaw, ul. Juliot Curie 14, PL-50383, Wrocław, Poland

    R. Jakubas

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  1. P. Carpentier
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  4. R. Jakubas
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Correspondence to J. Lefebvre.

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Carpentier, P., Zieliński, P., Lefebvre, J. et al. Phenomenological analysis of the phase transitions sequence in the ferroelectric crystal (CH3NH3)5Bi2Cl11 (PMACB). Z. Phys. B 102, 403–414 (1997). https://doi.org/10.1007/s002570050305

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  • DOI: https://doi.org/10.1007/s002570050305

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