Investigation of the Ferroelectric Paraelectric Phase Transition in Bulk and Confined Sodium Nitrite


YURTSEVEN H. H. , Sarikaya C. K.

FERROELECTRICS, vol.467, no.1, pp.42-49, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 467 Issue: 1
  • Publication Date: 2014
  • Doi Number: 10.1080/00150193.2014.932170
  • Journal Name: FERROELECTRICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.42-49
  • Keywords: Ferroelectric, Levanyuk-Sannikov model, NaNO2, SPECTROSCOPIC MODIFICATIONS, THERMAL-EXPANSION, PIPPARD RELATIONS, X-RAY, SPONTANEOUS POLARIZATION, INCOMMENSURATE PHASE, FREQUENCY-SHIFTS, NANO2, TEMPERATURE, DYNAMICS
  • Middle East Technical University Affiliated: Yes

Abstract

Levanyuk-Sannikov model is used to describe the ferroelectric-paraelectric transition in bulk and confined sodium nitrite (NaNO2). It is found on the basis of this model that the phase transition of NaNO2 for the bulk material is weakly first order whereas for the confined material it is a second order transition. Calculations are performed and the fitted parameters are obtained using this model for the ferroelectric-paraelectric transition in NaNO2. Our results indicate that the Levanyuk-Sannikov model describes adequately the observed behaviour of the ferroelectric-paraelectric transition in NaNO2.