Huge dielectric constant of Rb2CdI4 and K2ZnI4 crystals grown by Czochralski method

Temperature and frequency dependences of the dielectric constant and the spontaneous polarization were measured for crystals of Rb 2 CdI 4 and K 2 ZnI 4 obtained by the Czochralski method. The dielectric constant of both crystals shows a huge sharp peak just below the Curie point T C and the peak va...

Full description

Saved in:
Bibliographic Details
Published inPhase transitions Vol. 84; no. 9-10; pp. 865 - 871
Main Authors Yamaguchi, T., Gotou, S., Shimizu, F., Takashige, M.
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 01.09.2011
Subjects
Crystals
Curie temperature
Czochralski method
Dielectric constant
dielectric dispersion
Dispersions
domain motion
Ferroelectric domains
GeS
group ferroelectrics
Polarization
Spontaneous
structure
ZnI
Online AccessGet full text

Cover

More Information
Summary:Temperature and frequency dependences of the dielectric constant and the spontaneous polarization were measured for crystals of Rb 2 CdI 4 and K 2 ZnI 4 obtained by the Czochralski method. The dielectric constant of both crystals shows a huge sharp peak just below the Curie point T C and the peak value is 57,000 at T C  = 210.3 K of Rb 2 CdI 4 and 27,000 at T C  = 272.5 K of K 2 ZnI 4 . Below T C , it shows a shoulder-like dielectric dispersion, which is connected to ferroelectric domain motions. The spontaneous polarization of K 2 ZnI 4 was measured by the pyroelectric method and is about 3.9 × 10 -2  C m −2 at 4 K. The effects of dc field application on the dielectric properties are also discussed.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0141-1594
1029-0338
DOI:10.1080/01411594.2011.558305