Zeb, A, Jan, SU, Bamiduro, F et al. (2 more authors) (2018) Temperature-Stable Dielectric Ceramics based on Na₀.₅Bi₀.₅TiO₃. Journal of the European Ceramic Society, 38 (4). pp. 1548-1555. ISSN 0955-2219
Abstract
Multiple ion substitutions to Na0.5Bi0.5TiO3 give rise to favourable dielectric properties over the technologically important temperature range −55 °C to 300 °C. A relative permittivity, εr, = 1300 ± 15% was recorded, with low loss tangent, tanδ ≤ 0.025, for temperatures from 310 °C to 0 °C, tanδ increasing to 0.05 at −55 °C (1 kHz) in the targeted solid solution (1–x)[0.85Na0.5Bi0.5TiO3–0.15Ba0.8Ca0.2Ti1-yZryO3]–xNaNbO3: x = 0.3, y = 0.2. The εr-T plots for NaNbO3 contents x < 0.2 exhibited a frequency-dependent inflection below the temperature of a broad dielectric peak. Higher levels of niobate substitution resulted in a single peak with frequency dispersion, typical of a normal relaxor ferroelectric. Experimental trends in properties suggest that the dielectric inflection is the true relaxor dielectric peak and appears as an inflection due to overlap with an independent broad dielectric peak. Process-related cation and oxygen vacancies and their possible contributions to dielectric properties are discussed.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2017 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/). |
Keywords: | Dielectrics; Sodium bismuth titanate; High-temperature dielectrics; Capacitor materials |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Funding Information: | Funder Grant number EPSRC EP/P015514/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 21 Dec 2017 15:00 |
Last Modified: | 06 Apr 2018 15:21 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.jeurceramsoc.2017.12.032 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:125454 |