dc.contributor.author | Eberlins, Ojars Martins | |
dc.contributor.author | Birks, Eriks | |
dc.contributor.author | Antonova, Maija | |
dc.contributor.author | Kundzins, Maris | |
dc.contributor.author | Livins, Maris | |
dc.contributor.author | Sternberg, Andris | |
dc.date.accessioned | 2022-08-24T13:08:18Z | |
dc.date.available | 2022-08-24T13:08:18Z | |
dc.date.issued | 2022 | |
dc.identifier.issn | 2073-4352 | |
dc.identifier.uri | https://www.mdpi.com/2073-4352/12/2/134 | |
dc.identifier.uri | https://dspace.lu.lv/dspace/handle/7/61089 | |
dc.description | This research was funded by the Latvian Science Council Fund, grant number lzp-2020/2-0080. The Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme, grant number 739508. | en_US |
dc.description.abstract | Recently, promising results were obtained in studies of the electrocaloric effect in thin films. Therefore, research into this effect at high applied electric field values in bulk ferroelectrics is an important task for those scoping out materials that could be appropriate for cooling devices based on the electrocaloric effect. The present study addresses electrocaloric effect in (1−x)(0.8Na1/2Bi1/2TiO3-0.2BaTiO3 )−xCaTiO3 solid solutions by the direct method in electric fields ranging from 0 up to 100 kV/cm and at temperatures of up to 150◦C. The choice of 0.8Na1/2Bi1/2TiO3-0.2BaTiO3 as the starting composition is motivated by high spontaneous polarization within the studied range of electric fields, while CaTiO3 is added to reduce depolarization temperature at, and below, room temperature. In the studied temperature range, the maximal value of electrocaloric effect with temperature change of ∆T = 1.0◦C was found in the composition with x = 0.050 at 100◦C, having significant contribution from the entropy jump at the first-order phase transition induced by an electric field. At increasing CaTiO3 concentration, the attainable ∆T decreases. Measurements of polarization current, which were taken simultaneously with ∆T measurements, allowed us to study differences between ∆T obtained by the direct and the indirect methods. © 2022 by the authors. Licensee MDPI, Basel, Switzerland. | en_US |
dc.description.sponsorship | Latvian Science Council Fund lzp-2020/2-0080; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017 TeamingPhase2 under grant agreement No. 739508, project CAMART2. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | MDPI | en_US |
dc.relation | info:eu-repo/grantAgreement/EC/H2020/739508/EU/Centre of Advanced Material Research and Technology Transfer/CAMART² | en_US |
dc.relation.ispartofseries | Crystals;12 (2), 134 | |
dc.rights | info:eu-repo/semantics/openAccess | en_US |
dc.subject | Research Subject Categories::NATURAL SCIENCES | en_US |
dc.subject | Dielectric polarization | en_US |
dc.subject | Electrocaloric effect | en_US |
dc.subject | Maxwell relation | en_US |
dc.subject | Phase transitions | en_US |
dc.subject | Sodium bismuth titanate | en_US |
dc.subject | Solid solutions | en_US |
dc.title | Electrocaloric Effect in (1−x)(0.8Na0.5Bi0.5TiO3-0.2BaTiO3)− xCaTiO3 Solid Solutions at High Electric Fields | en_US |
dc.type | info:eu-repo/semantics/article | en_US |
dc.identifier.doi | 10.3390/cryst12020134 | |