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      • Record: found
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      Mn-Doped BaTiO 3 Ceramics: Thermal and Electrical Properties for Multicaloric Applications

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          Abstract

          Multiferroic materials are widely used in microelectronics because they are sensitive to elastic, magnetic, and electric fields and there is an intrinsic coupling between them. In particular, transition metal-doped BaTiO 3 is considered as a viable multiferroic because of the simultaneous presence of ferroelectricity and magnetism. In this work, we study the electrical and thermal properties of Mn-doped BaTiO 3 ceramics that can be used for multicaloric applications. We found that Mn doping leads to the broadening and shifting of the phase transition accompanied with simultaneous decrease of latent heat and entropy. Mn doping causes a decrease in the bulk resistivity while contact resistance remains intact. Doped ceramics can withstand high electric fields (up to 40 kV/cm) and exhibit linear I-V characteristics followed by the Schottky limited current in contrast to earlier observations. As such, these ceramics are promising for multicaloric applications.

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          Multiferroics: a magnetic twist for ferroelectricity.

          Sang-Wook Cheong, Maxim Mostovoy (2007)
          Magnetism and ferroelectricity are essential to many forms of current technology, and the quest for multiferroic materials, where these two phenomena are intimately coupled, is of great technological and fundamental importance. Ferroelectricity and magnetism tend to be mutually exclusive and interact weakly with each other when they coexist. The exciting new development is the discovery that even a weak magnetoelectric interaction can lead to spectacular cross-coupling effects when it induces electric polarization in a magnetically ordered state. Such magnetic ferroelectricity, showing an unprecedented sensitivity to ap plied magnetic fields, occurs in 'frustrated magnets' with competing interactions between spins and complex magnetic orders. We summarize key experimental findings and the current theoretical understanding of these phenomena, which have great potential for tuneable multifunctional devices.
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            Multiferroic magnetoelectric composites: Historical perspective, status, and future directions

            Ce-Wen Nan, M. I. Bichurin, Shuxiang Dong … (2008)
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              Large electric-field-induced strain in ferroelectric crystals by point-defect-mediated reversible domain switching.

              Xiaobing Ren (2004)
              Ferroelectric crystals are characterized by their asymmetric or polar structures. In an electric field, ions undergo asymmetric displacement and result in a small change in crystal dimension, which is proportional to the applied field. Such electric-field-induced strain (or piezoelectricity) has found extensive applications in actuators and sensors. However, the effect is generally very small and thus limits its usefulness. Here I show that with a different mechanism, an aged BaTiO(3) single crystal can generate a large recoverable nonlinear strain of 0.75% at a low field of 200 V mm(-1). At the same field this value is about 40 times higher than piezoelectric Pb(Zr, Ti)O(3) (PZT) ceramics and more than 10 times higher than the high-strain Pb(Zn(1/3)Nb(2/3))O(3)-PbTiO(3) (PZN-PT) single crystals. This large electro-strain stems from an unusual reversible domain switching (most importantly the switching of non-180 degrees domains) in which the restoring force is provided by a general symmetry-conforming property of point defects. This mechanism provides a general method to achieve large electro-strain effect in a wide range of ferroelectric systems and the effect may lead to novel applications in ultra-large stroke and nonlinear actuators.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Materials (Basel)
                Journal ID (iso-abbrev): Materials (Basel)
                Journal ID (publisher-id): materials
                Title: Materials
                Publisher: MDPI
                ISSN (Electronic): 1996-1944
                Publication date (Electronic): 31 October 2019
                Publication date Collection: November 2019
                Volume: 12
                Issue: 21
                Electronic Location Identifier: 3592
                Affiliations
                [1 ]Department of physics, Saint Petersburg State Electrotechnical University, St. Petersburg 197376, Russia; semalexander@ 123456gmail.com (A.S.); dedyk_ai@ 123456mail.ru (A.D.); mylnikov.il@ 123456gmail.com (I.M.); antonburovihin@ 123456mail.ru (A.B.); yulia.pavlova@ 123456gmail.com (Y.P.)
                [2 ]Laboratory “Materials and Structures for Electro- and Magnetocaloric Energy Conversion”, ITMO University, St. Petersburg 197101, Russia; oleg.cryogenics@ 123456gmail.com (O.P.); aeskow@ 123456gmail.com (A.E.); itmo.tfi@ 123456gmail.com (V.K.); atselev@ 123456ua.pt (A.T.)
                [3 ]SCAMT Institute, ITMO University, St. Petersburg 197101, Russia; sanman4242@ 123456gmail.com
                [4 ]Department of Mathematics and Physics, Lappeenranta University of Technology, 53850 Lappeenranta, Finland
                [5 ]Department of Physics & CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
                [6 ]School of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620000, Russia
                Author notes
                [* ]Correspondence: kholkin@ 123456ua.pt ; Tel.: +351-234-247-025
                Author information
                https://orcid.org/0000-0002-5147-0630
                https://orcid.org/0000-0002-0098-6696
                https://orcid.org/0000-0003-3432-7610
                Article
                Publisher ID: materials-12-03592
                DOI: 10.3390/ma12213592
                PMC ID: 6862048
                PubMed ID: 31683682
                SO-VID: 53d94f71-5df9-45b0-97aa-1ea655a1c292
                Copyright © © 2019 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 02 October 2019
                Date accepted : 28 October 2019
                Categories
                Subject: Article

                Keywords: batio3,electrocalorics,magnetocalorics,phase transition,specific heat
                Data availability:
                Keywords: batio3, electrocalorics, magnetocalorics, phase transition, specific heat

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