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The role of Tb-doping on the structural and functional properties of Bi4-xTbxTi3O12 ferroelectric phases with the Aurivillius type structure
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Karpov Inst Phys Chem, Ul Vorontsovo Pole 10, Moscow 105064, Russia..
RUDN Univ, Ul Miklukho Maklaya 6, Moscow 117198, Russia..
Karpov Inst Phys Chem, Ul Vorontsovo Pole 10, Moscow 105064, Russia..
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2017 (English)In: Journal of materials science. Materials in electronics, ISSN 0957-4522, E-ISSN 1573-482X, Vol. 28, no 6, 4914-4924 p.Article in journal (Refereed) Published
Abstract [en]

Synthesis, crystal structure, dielectric, and magnetic properties of the Aurivillius phase Bi4-xTbxTi3O12 (x = 0.0, 0.4, 0.6, 0.8) are reported. The samples were synthesized using standard solid state reaction technique. The thermal stability of the obtained solid solutions was investigated. For x ae<currency> 0.8, the samples crystallized in an orthorhombic symmetry. All the samples showed finite second harmonic generation response indicating a non-centrosymmetric structure. The structural data could be refined using the polar orthorhombic space group B2cb. The orthorhombicity decreases with an increase in the Tb3+ concentration. The orthorhombic distortions in these compositions are related to the Bi3+-based perovskite sublattice. Our results indicate that the non-lone pair Tb3+ cations preferentially occupy the perovskite sublattice initially, but with an increase in the doping concentration they can partially substitute the Bi3+ ions in the fluorite block. Temperature dependent dielectric measurements revealed a decrease in the ferroelectric Curie temperature T-C with an increase in x from T-C = 904 K (for x = 0) to 877 K (for x = 0.4). Further increase in x led to a cross-over to a relaxor-type behavior. Magnetic measurements showed that the samples are paramagnetic down to 5 K.

Place, publisher, year, edition, pages
SPRINGER , 2017. Vol. 28, no 6, 4914-4924 p.
National Category
Condensed Matter Physics Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-320357DOI: 10.1007/s10854-016-6140-7ISI: 000395072700052OAI: oai:DiVA.org:uu-320357DiVA: diva2:1089278
Funder
Swedish Research CouncilThe Swedish Foundation for International Cooperation in Research and Higher Education (STINT)
Available from: 2017-04-19 Created: 2017-04-19 Last updated: 2017-04-25Bibliographically approved

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Sarkar, TapatiIvanov, Sergey A.Nordblad, PerMathieu, Roland
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