X-ray and dielectric studies of hot-pressed K2Sr4Nb10O30 ceramics

O. A. Bunina, Yu A. Kuprina, I. P. Raevski*, Ya S. Knyazeva, S. I. Raevskaya, Haydn Chen, C. C. Chou, V. V. Titov, D. Mezzane, E. I. Sitalo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

X-ray diffraction (XRD) and dielectric studies of dense hot-pressed K2Sr4Nb10O30 ceramics with a tetragonal tungsten bronze–type structure revealed texturing of the samples and substantial anisotropy of the dielectric permittivity. XRD studies of the K2Sr4Nb10O30 powder show a diffuse phase transition in the 140 – 160°C range while a diffused and frequency-independent maximum of the dielectric permittivity is observed at about 120–125°C for ceramic samples. Substantial anisotropy of the dielectric permittivity (more than 50% in the phase transition region) as well as sample's texturing and a difference between phase transition temperatures of the powder and ceramic samples are supposed to be caused by anisotropic residual stresses.

Original languageEnglish
Pages (from-to)145-153
Number of pages9
JournalFerroelectrics
Volume501
Issue number1
DOIs
StatePublished - 1 Sep 2016

Keywords

  • KSrNbO
  • Tetragonal tungsten bronze
  • X-ray diffraction
  • phase transition
  • texture

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