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Phase transitions in the ferroelectric crystals [CH3NH3]5Bi2Cl11 and [CH3NH3]5Bi2Br11 studied by the nonlinear dielectric effect.
Autorzy
Rok wydania
2006
Czasopismo
Numer woluminu
74
Strony
1-7
DOI
10.1103/PhysRevB.74.184111
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The real part of the complex electric permittivity at low frequencies and at several biasing fields 共between 0and 5⫻105V/m兲has been measured in ferroelectric crystals 关CH3NH3兴5Bi2Cl11 共MAPCB兲and关CH3NH3兴5Bi2Br11 共MAPBB兲in the temperature range covering the temperature of the ferroelectric phasetransitions. Comparative measurements for the known triglycine sulphate 共NH2CH2COOH兲3H2SO4crystalhave been used as a test of the validity and of possible errors in the determination of the ferroelectric equationof state by the method applied. The estimates of the critical parameters TC, and␦then have been evaluatedfor MAPCB and MAPBB on the basis of the Widom-Griffiths scaling hypothesis. Complementary pyroelectricmeasurements of the spontaneous polarization providing the critical exponentare in accordance with theparameters obtained
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