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引用次数: 0
摘要
随着电子设备微型化需求的增加,具有 ABO3 结构的陶瓷需要进一步提高介电常数和高介电常数。本研究通过固态反应过程制备了 Ba1-1.5xBixTiO3 (BB100xT, x = 0.0025, 0.005, 0.0075, 0.01) 陶瓷。研究了 Bi 掺杂对无铅弛豫铁电体 BaTiO3 基陶瓷介电性能的影响。结果表明,在 x = 0.5% 时,BB100xT 陶瓷实现了巨大的介电系数 (37,174) 和 TCC ≤ ±15% (-27-141 °C) 的温度稳定性。A 位供体掺杂产生了 A 位空位,为 Ti4+ 提供了更大的空间,并产生了分量波动,这是高介电常数的部分原因,也是温度稳定性的原因。同时,缺陷偶极子、IBLC 和 SBLC 效应对极化的贡献导致了巨大的介电常数。当掺杂含量高于 0.5% 时,烧结过程中液相的形成促进了传质。这项工作有助于通过缺陷工程学探索具有巨大介电常数和温度稳定性的新型多层陶瓷电容器。
Defect Control of Donor Doping on Dielectric Ceramics to Improve the Colossal Permittivity and Temperature Stability
As the demand for miniaturization of electronic devices increases, ceramics with an ABO3 structure require further improvement of the dielectric constant with high permittivity. In the present work, Ba1−1.5xBixTiO3 (BB100xT, x = 0.0025, 0.005, 0.0075, 0.01) ceramics were prepared via a solid-state reaction process. The effect of Bi doping on dielectric properties of lead-free relaxor ferroelectric BaTiO3-based ceramics was studied. The results showed that both colossal permittivity (37,174) and a temperature stability of TCC ≤ ±15% (−27–141 °C) were achieved in BB100xT ceramics at x = 0.5%. The A-site donor doping produces A-site vacancies, a larger space for Ti4+, and fluctuation of the component, which is partially responsible for the high permittivity and responsible for the temperature stability. Meanwhile, the contribution of defect dipoles, and IBLC and SBLC effects to polarization leads to the colossal permittivity. The formation of a liquid phase during sintering promotes mass transfer when the doping content is higher than 0.5%. This work benefits the exploration of novel multilayer ceramic capacitors with colossal permittivity and temperature stability via defect engineering.
CoatingsMaterials Science-Surfaces, Coatings and Films
CiteScore
5.00
自引率
11.80%
发文量
1657
审稿时长
1.4 months
期刊介绍:
Coatings is an international, peer-reviewed open access journal of coatings and surface engineering. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided. There are, in addition, unique features of this journal:
* manuscripts regarding research proposals and research ideas will be particularly welcomed
* electronic files or software regarding the full details of the calculation and experimental procedure - if unable to be published in a normal way - can be deposited as supplementary material