Dielectric and ferroelectric response of compositionally graded bilayer and trilayer composites of BaTiO3 and 0.975BaTiO(3) 0.025Ba(Cu1/3Nb2/3)O-3

dc.contributorVirginia Tech. Department of Materials Science and Engineering. Center for Energy Harvesting Materials and Systems (CEHMS)en
dc.contributorChiang Mai University. Department of Physics and Materials Scienceen
dc.contributorSuranaree University of Technology. School of Physics. Institute of Scienceen
dc.contributor.authorMaurya, Deepamen
dc.contributor.authorWongdamnern, Natthapongen
dc.contributor.authorYimnirun, Rattikornen
dc.contributor.authorPriya, Shashanken
dc.contributor.departmentMaterials Science and Engineering (MSE)en
dc.description.abstractIn this paper, we report the dielectric and ferroelectric response of compositionally graded bilayer and trilayer composites consisting of BaTiO3 (BT) and 0.975BaTiO(3)-0.025Ba(Cu1/3Nb2/3)O-3 (BTBCN). Two types of graded bilayer samples were synthesized, one with same thickness of BT and BTBCN while other with different layer thicknesses. The graded trilayer sample consisted of BT layer sandwiched between two BTBCN layers of equal thickness. Scanning electron microscopy and transmission electron microscopy images showed a sharp interface with needle-shape domains across the interface. The domain size on BT side was found to be larger than that on BTBCN side. The temperature dependence of dielectric response for all composite systems was found to exhibit shifting in characteristic Curie peak compared to constituent material which was associated to coupling between layers. Moreover, the differences in grain size, tetragonality, domain mobility of each layer was found to perturb the electrical response of composite. The polarization mismatch between uncoupled BT and BTBCN established internal electric field in composite specimen and defined new polarization states in each layer by perturbing free energy functional of the composite specimen. Dynamic hysteresis behaviors and power-law scaling relations of all specimens were determined from polarization-electric field hysteresis loop measurements as a function of frequency. All systems were found to exhibit similar dynamic scaling relationships. Hysteresis area < A >, P-r, and E-C decreased with increasing frequency due to delayed response but increased with increasing applied electric field due to enhancement of driving force. Trilayer system was found to exhibit strong internal-bias field and double hysteresis behavior. The coupling effect resulting due to polarization mismatch between layers had substantial influence on the dynamic hysteresis behavior and power-law scaling relations. (C) 2010 American Institute of Physics. [doi:10.1063/1.3514125]en
dc.description.sponsorshipNational Science Foundation (U.S.). Division of Materials Research. Materials World Networken
dc.description.sponsorshipUnited States. Department of Energy. Office of Basic Energy Sciences - Contract No. DE-FG02–07ER46480en
dc.format.extent11 pagesen
dc.identifier.citationMaurya, Deepam, Wongdamnern, Natthapong, Yimnirun, Rattikorn, Priya, Shashank (2010). Dielectric and ferroelectric response of compositionally graded bilayer and trilayer composites of BaTiO3 and 0.975BaTiO(3)-0.025Ba(Cu1/3Nb2/3)O-3. Journal of Applied Physics, 108(12). doi: 10.1063/1.3514125en
dc.publisherAmerican Institute of Physicsen
dc.rightsIn Copyrighten
dc.subjectElectrical hysteresisen
dc.subjectCoercive forceen
dc.subjectElectric fieldsen
dc.titleDielectric and ferroelectric response of compositionally graded bilayer and trilayer composites of BaTiO3 and 0.975BaTiO(3) 0.025Ba(Cu1/3Nb2/3)O-3en
dc.title.serialJournal of Applied Physicsen
dc.typeArticle - Refereeden
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