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Reducing dielectric loss in Na0.5Bi0.5TiO3 based high temperature capacitor material

Hoang, An-Phuc ; Steiner, Sebastian ; Yang, Fan ; Li, Linhao ; Sinclair, Derek C. ; Frömling, Till (2021)
Reducing dielectric loss in Na0.5Bi0.5TiO3 based high temperature capacitor material.
In: Journal of the European Ceramic Society, 41 (4)
doi: 10.1016/j.jeurceramsoc.2020.07.005
Article, Bibliographie

Abstract

The demand for capacitors exhibiting low sensitivity towards temperature changes and high power peaks has increased significantly. Recently, Na0.5Bi0.5TiO3 (NBT) based ceramics became excellent candidates for such extreme temperature capacitors. The dielectric loss of these materials is, however, difficult to control because of the complex defect chemistry of NBT based ceramics. Therefore, it is the limiting factor for high temperature applications. In this work, we present a strategy to increase the upper temperature limit for low dielectric loss. The addition of BiAlO3 to Na0.5Bi0.5TiO3-BaTiO3-CaZrO3 reduces the loss and sensitivity towards Bi evaporation during synthesis. For unmodified samples, the relative permittivity (εr = 581, at 1 kHz) varies less than 15 %, while the dielectric loss stays below 0.02 between -68 and 368 °C. With the addition of BiAlO3, the temperature range of low loss extends from -68 to 391 °C at even higher permittivity (εr = 628, at 1 kHz).

Item Type: Article
Erschienen: 2021
Creators: Hoang, An-Phuc ; Steiner, Sebastian ; Yang, Fan ; Li, Linhao ; Sinclair, Derek C. ; Frömling, Till
Type of entry: Bibliographie
Title: Reducing dielectric loss in Na0.5Bi0.5TiO3 based high temperature capacitor material
Language: English
Date: April 2021
Journal or Publication Title: Journal of the European Ceramic Society
Volume of the journal: 41
Issue Number: 4
DOI: 10.1016/j.jeurceramsoc.2020.07.005
Abstract:

The demand for capacitors exhibiting low sensitivity towards temperature changes and high power peaks has increased significantly. Recently, Na0.5Bi0.5TiO3 (NBT) based ceramics became excellent candidates for such extreme temperature capacitors. The dielectric loss of these materials is, however, difficult to control because of the complex defect chemistry of NBT based ceramics. Therefore, it is the limiting factor for high temperature applications. In this work, we present a strategy to increase the upper temperature limit for low dielectric loss. The addition of BiAlO3 to Na0.5Bi0.5TiO3-BaTiO3-CaZrO3 reduces the loss and sensitivity towards Bi evaporation during synthesis. For unmodified samples, the relative permittivity (εr = 581, at 1 kHz) varies less than 15 %, while the dielectric loss stays below 0.02 between -68 and 368 °C. With the addition of BiAlO3, the temperature range of low loss extends from -68 to 391 °C at even higher permittivity (εr = 628, at 1 kHz).

Uncontrolled Keywords: High temperature capacitor defect chemistry dielectric loss lead-free NBT
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 01 Mar 2021 06:29
Last Modified: 01 Mar 2021 06:29
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