Broadband dielectric spectroscopy of CuInP2Se6crystals

✍ Scribed by Macutkevic, Jan ;Banys, Juras ;Vysochanskii, Yulian

• Book ID: 105365053
• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 490 KB
• Volume: 206
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200824231

✦ Synopsis

Abstract

Investigation results of broadband dielectric (from 20 Hz to 1.2 GHz) properties of layered CuInP~2~Se~6~ crystals are presented. The temperature dependence of the static dielectric permittivity reveals a ferroelectric phase transition at T~c~ = 225 K. In the paraelectric phase, at low frequencies, dielectric spectra are highly influenced by the high ionic con‐ ductivity with the activation energy of 3653.4 K (0.315 eV). In the ferroelectric phase the electrical conductivity and its activation energy (531.1 K (0.045 eV)) are considerably smaller. The high‐frequency part of the spectra is determined by a relaxational soft mode. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)