Birefringent and Dielectric Properties of [N(C_{2}H_{5})_{4}]_{2}ZnBr_{4} and [N(C_{2}H_{5})_{4}]_{2}CdBr_{4} Crystals

• Authors: S. Sveleba , V. Mokryi , I. Polovinko , V. Kapustyanik , Z. Trybuła , P. Petrenko , G. Kiosse , V. Kravtsov
• Languages of publication: EN

Abstracts

EN

Dielectric and birefringent properties of [N(C_{2}H_{5})_{4}]_{2}ZnBr_{4} and [N(C_{2}H_{5})_{4}]_{2}CdBr_{4} crystals were investigated. It has been ascertained that two phase transitions manifest themselves in the temperature dependencies є(T) for [N(C_{2}H_{5})_{4}]_{2}CdBr_{4} crystal - a second-order transition at T_{1} = 311 K and a first-order one - at T_{2} = 39 K (∆T_{2} = 11 K). Besides two earlier known phase transitions in [N(C_{2}H_{5})_{4}]_{2}ZnBr_{4} at T_{1} = 350 K and T^{cool}_{2} = 282.8 K (∆T_{2} ≈ 2.3 K), the additional one was found at T*_{2} = 287.0 K, both on the cooling and heating runs. On the basis of the data about the peculiarities of dielectric and optical properties in the vicinity of T_{2} one can made the conclusion about the ferroelectric character of the phase, situated between T*_{2} and T^{cool}_{2}.

Keywords

EN

77.22.Ch; 77.22.-d; 78.20.Fm; 64.70.-p

Discipline

• 78.20.Fm: Birefringence
• 77.22.-d: Dielectric properties of solids and liquids(for dielectric properties of tissues and organs, see 87.19.rf)
• 77.22.Ch: Permittivity (dielectric function)(for low-permittivity dielectric films, see 77.55.Bh; for high-permittivity gate dielectric films, 77.55.D-)
• 64.70.-p: Specific phase transitions

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1993
• Volume: 83
• Issue: 6
• Pages: 777-784

Dates

published

1993-06

received

1992-04-15

(unknown)

1993-03-16

Contributors

author

S. Sveleba

• Lviv State University, Lomonosov Str. 8, 290005 Lviv, Ukraine

author

V. Mokryi

• Lviv State University, Lomonosov Str. 8, 290005 Lviv, Ukraine

author

I. Polovinko

• Lviv State University, Lomonosov Str. 8, 290005 Lviv, Ukraine

author

V. Kapustyanik

• Lviv State University, Lomonosov Str. 8, 290005 Lviv, Ukraine

author

Z. Trybuła

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17/19, 60-179 Poznań, Poland

author

P. Petrenko

• Institute of Applied Physics, Acad. Sci. Moldova, Kishineu, Moldova

author

G. Kiosse

• Institute of Applied Physics, Acad. Sci. Moldova, Kishineu, Moldova

author

V. Kravtsov

• Institute of Applied Physics, Acad. Sci. Moldova, Kishineu, Moldova

Identifiers

DOI

10.12693/APhysPolA.83.777