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Titolo:
Lattice mediated interactions and ferroelectric anomalies in the crystal (CH3NH3)(5)Bi2Cl11 (PMACB)
Autore:
Carpentier, P; Lefebvre, J; Jakubas, R; Zajac, W; Zielinski, P;
Indirizzi:
Inst Nucl Phys, PL-31342 Krakow, Poland Inst Nucl Phys Krakow Poland PL-31342 Nucl Phys, PL-31342 Krakow, Poland Univ Lille 1, CNRS, URA 801, LDSMM, F-59655 Villeneuve Dascq, France Univ Lille 1 Villeneuve Dascq France F-59655 55 Villeneuve Dascq, France Univ Wroclaw, Inst Chem, PL-50383 Wroclaw, Poland Univ Wroclaw Wroclaw Poland PL-50383 Inst Chem, PL-50383 Wroclaw, Poland
Titolo Testata:
PHASE TRANSITIONS
fascicolo: 4, volume: 67, anno: 1999,
parte:, B
pagine: 571 - 586
SICI:
0141-1594(1999)67:4<571:LMIAFA>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHASE-TRANSITIONS; (CH3NH3)5BI2CL11 CRYSTALS; HEAT;
Keywords:
ferroelectricity; isomorphous anomaly; tricritical point; compressible pseudospin model;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Zielinski, P Inst Nucl Phys, Ul Radzikowskiego 152, PL-31342 Krakow, Poland Inst Nucl Phys Ul Radzikowskiego 152 Krakow Poland PL-31342
Citazione:
P. Carpentier et al., "Lattice mediated interactions and ferroelectric anomalies in the crystal (CH3NH3)(5)Bi2Cl11 (PMACB)", PHASE TRAN, 67(4), 1999, pp. 571-586

Abstract

A two-sublattice compressible pseudospin model has been constructed to describe the behaviour of the spontaneous polarisation of PMACB in the temperature region comprising the ferroelectric phase transition (T=307K) and the isomorphous anomaly (T= 180 K). A strong coupling of pseudospins with a "pancake" strain -(2 epsilon(33) - epsilon(11) - epsilon(22))/3 resulting fromthe comparison of the model with the experimental spontaneous polarisationagrees with the existing data on the dielectric susceptibility, and on thespecific heat. The ferroelectric phase transition then turns out to be close to a tricritical point. The numerical values of the parameters of the model show how the ferroelastic phase transition (T=260 K) can occur in this crystal without any discernible effect on the specific heat and on the dielectric susceptibility.

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Documento generato il 05/12/20 alle ore 00:06:59