6533b838fe1ef96bd12a4f1e

RESEARCH PRODUCT

Phase transitions in Na0.5Bi0.5TiO3-(Sr0.7Bi0.2)TiO3-PbTiO3 solid solutions

Eriks BirksJani PeräntieMaija AntonovaM. DunceAndris SternbergJuha HagbergR. Ignatans

subject

010302 applied physicsPhase transitionRange (particle radiation)Materials scienceCondensed matter physicsDielectric permittivity02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesElectronic Optical and Magnetic Materials0103 physical sciencesElectrocaloric effect0210 nano-technologyPolarization (electrochemistry)Solid solution

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ABSTRACTIncreasing of Sr0.7Bi0.2TiO3 concentration in Na0.5Bi0.5TiO3-Sr0.7Bi0.2TiO3 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 Na0.5Bi0.5TiO3. Here changes in behavior of dielectric permittivity and polarization are studied if PbTiO3 is added in a certain concentration range of Na0.5Bi0.5TiO3-Sr0.7Bi0.2TiO3 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 Na0.5Bi0.5TiO3-SrTiO3-PbTiO3.

yearjournalcountryeditionlanguage
2016-05-18Ferroelectrics
https://doi.org/10.1080/00150193.2016.1168213