Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 2, Pages 3170-3176Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.10.107
Keywords
Dielectric properties; Sol-hydrothermal synthesis; Dy-doping; BaTiO3
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Funding
- National Natural Science Foundation of China [51372114, 51202118]
- State Key Laboratory of Mechanics and Control of Mechanical Structures (Nanjing University of Aeronautics and Astronautics) [0514Y01]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Monodisperse Dy-doped BaTiO3 nanopowders (xDBT) with x=0, 1, 2, 3, 4, 5 mol% has been synthesized via a modified sol-hydrothermal method. And the influence of Dy3+ on the crystal structure, micromorphology and dielectric properties of xDBT ceramics has been investigated. It's found that Dy3+ slightly affects the shape of the xDBT nanopowders, whereas excess Dy3+ would cause the formation of the Dy(OH)(3) impurity. In addition, the grain growth during a sintering process is suppressed with the Dy3+ incorporation. Further, the possible occupation of the Dy3+ has been extrapolated based on the variation of lattice volume and phase composition. A self-compensation mode involving the simultaneously occupation at Ba-site and Ti-site is observed in the samples with 4 mol% Dy. Importantly, stabilized temperature-dependent dielectric properties has been achieved at x=4 mol%, resulting from the diffuse phase transition behaviors (the calculated diffuse factor gamma=1.952) induced by chemical inhomogeneity. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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