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dc.contributor.advisorPalai, Ratnakar
dc.contributor.authorMasso Ferret, Roberto
dc.description.abstractWe report herein the synthesis and suitable approach to improve the magnetoelectric (ME) coupling of Bismuth ferrite oxide (BFO) by fabrication of BFO<sub>1&minus;x-</sub>GMO<sub>x</sub> and BFO<sub>1&minus;x-</sub>DMO<sub>x</sub> solid solutions for 0.0&le; x &le;0.2 by the autocombustion method. The materials have been systematically characterized and examined to study the possibility of the compositional driven structural phase transition and its correlation with the ME coupling. Detail of the structural, microstructural, thermal, dielectric, ferroelectric, magnetic, magneto-dielectric, and magneto-impedance properties will be shown in the light of the bring down of magnetic ordering temperature of BiFeO<sub>3</sub> towards room temperature as a function of increasing GdMnO<sub>3</sub> and DyMnO<sub>3</sub> concentration. The dielectric and electrical properties as a function of the magnetic field indicated the signature of ME coupling in samples with increased GdMnO<sub>3</sub> and DyMnO<sub>3</sub> composition, suggesting an optimization of functional properties of lead-free doped BiFeO<sub>3</sub>. In pure BiFeO<sub>3</sub> and all the combinations of BFO<sub>1&minus;x-</sub>GMO<sub>x</sub> and BFO<sub>1&minus;x-</sub>DMO<sub>x</sub> was found that the transport mechanism is a Space-Charge-Limited mechanism. We performed our measurements in a temperature range of 100-500K. The Fowler-Northeim Conduction Mechanism fit was used but we found that it does not describe or fit the data. The same happened with Schottky Barrier- and Pool-Frenkel fitting. We determined that the relaxation process occurring in our samples is of the kind of space charge polarization. The charge carrier density and the general density of state decreases with increasing temperature, but not the mobility of the samples, suggesting a hopping mobility type of small polaron.en_US
dc.description.sponsorshipThis work is supported by the National Science Foundation (NSF DMR-1410869) and the NSF-PREM center(NSF-PREM-1827622).en_US
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 United States*
dc.subjectConduction mechanism.en_US
dc.subjectMagnetodielectric couplingen_US
dc.subjectMagnetoelectric couplingen_US
dc.subject.lcshElectromagnetic fieldsen_US
dc.titleMagnetodielectric effect and conduction mechanism in BFO-REMO multiferroicsen_US
dc.rights.holder© 2021 Roberto Masso Ferreten_US
dc.contributor.committeeKatiyar, Ram S.
dc.contributor.committeeCabrera, Carlos R.
dc.contributor.campusUniversity of Puerto Rico, Río Piedras Campusen_US
dc.description.graduationSemesterSummer (3rd Semester)en_US
dc.description.graduationYear2021en_US Physicsen_US

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Attribution-NonCommercial-NoDerivs 3.0 United States
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 United States