Phase transitions in Na0.5Bi0.5TiO3-(Sr0.7Bi0.2)TiO3-PbTiO3 solid solutions. Issue 1 (31st August 2016)

• Record Type: Journal Article
• Authors: Dunce, M.; Birks, E.; Peräntie, J.; Hagberg, J.; Antonova, M.; Ignatans, R.; Sternberg, A.
• Is Part Of: Ferroelectrics. Volume 498:Issue 1(2016)
• Page Start: 94
• Page End: 101
• Publication Date: 2016-08-31
• Subjects: NBT -- solid solutions -- phase transitions -- electrocaloric effect; Ferroelectricity -- Periodicals; Ferroelectric crystals -- Periodicals; 537
• DOI: 10.1080/00150193.2016.1168213
• Languages: English
• ISSNs: 0015-0193

Abstract

ABSTRACT: Increasing of Sr0.7 Bi0.2 TiO3 concentration in Na0.5 Bi0.5 TiO3 -Sr0.7 Bi0.2 TiO3 solid solutions causes increasing of Bi/Na relation and vacancies in the A-site of perovskite structure. In temperature dependence of dielectric permittivity, such a change of composition is reflected by transforming of the frequency-dependent shoulder into a maximum characteristic for relaxor ferroelectrics and diminishing of the frequency-independent maximum characteristic for Na0.5 Bi0.5 TiO3 . Here changes in behavior of dielectric permittivity and polarization are studied if PbTiO3 is added in a certain concentration range of Na0.5 Bi0.5 TiO3 -Sr0.7 Bi0.2 TiO3 solid solutions. Changes of the characteristic temperatures as a function of PbTiO3 concentration are determined. Behavior of the electrocaloric effect is compared with the results obtained for Na0.5 Bi0.5 TiO3 -SrTiO3 -PbTiO3 .