Journal
SCRIPTA MATERIALIA
Volume 146, Issue -, Pages 110-114Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.11.026
Keywords
Colossal permittivity; Ceramics; Point defects; Dielectric
Categories
Funding
- National Natural Science Foundation of China [51402234]
- Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shaanxi Province
- New-Star of Science and Technology of Xi'an University of Technology [101-256101511]
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Nb5+ and/or In3+ doped BaTiO3 ceramics were prepared by a conventional solid-state method, followed by annealing in N-2. At the room temperature and 1 kHz, permittivity of Nb5+ doped BaTiO3 (BTNb) is up to 80,888 and its dielectric loss is as low as 0.03. The origin of the colossal permittivity in BTNb is ascribed to the giant defect dipoles (Ti4+ . e' - Ti4+ - e'). Besides, (V-Ba -V-O) defect dipoles are also proved to be present in BTNb, which plays an important role on maintaining lower dielectric loss in a wide temperature region for BTNb. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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