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Dielectric and ferroelectric properties of the mixed crystals system (CH3NH3)5Bi2(1-x)Sb2xCl11.

Autorzy

Grażyna Bator

J. Mróz

Ryszard Jakubas

Rok wydania

1997

Czasopismo

Physica B-Condensed Matter

Numer woluminu

240

Strony

362-371

DOI

10.1016/S0921-4526(97)00445-6

Kolekcja

Naukowa

Język

Angielski

Typ publikacji

Artykuł

Streszczenie

Dielectric and pyroelectric properties of the mixed crystals system, (CH3NH3)5Bi2(1 − x)Sb2xCl11 (0 < x < 0.25) were systematically investigated. Temperature dependencies of ε′c in the vicinity of ferro-paraelectric phase transition were measured for the mixed crystals with x = 0.05, 0.07, 0.11, 0.13 and 0.25 in the frequency region 1 kHz–1 MHz. The substitution of bismuth atoms by antimony drastically reduces the magnitude of ε′c and shifts the ferro-paraelectric phase transition towards higher temperatures. The dielectric dispersion of the complex electric permittivity, , in x = 0.05 crystals was studied in the frequency range from 30 to 1000 MHz. Around 321 K phase transition, two dielectric relaxators are postulated; a low-frequency one in the megahertz region showing a critical slowing down and a high-frequency one in the gigahertz region.

Słowa kluczowe

Alkylammonium halogenobismuthates (III), Ferroelectric properties, Phase transition, Spontaneous polarization, Dielectric dispersion

Adres publiczny

https://doi.org/10.1016/S0921-4526(97)00445-6

Strona internetowa wydawcy

http://www.elsevier.com

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