Peirson, H, Pan, J, Li, Y et al. (4 more authors) (2023) Structure and dielectric properties of yttrium-doped Ca0.28Ba0.72Nb2O6 ceramics. Journal of Alloys and Compounds, 950. 169891. ISSN 0925-8388
Abstract
An unfilled tungsten bronze-structured ferroelectric ceramic, Ca0.28Ba0.72Nb2O6 (CBN28), has been doped with Y3+ to produce ceramics with a nominal composition, (Ca0.28Ba0.72)1–3w/2YwNb2O6 [0 ≤ w ≤ 0.05]. The substitution of Y3+ for Ca2+/Ba2+, and consequent additional vacancy formation, is assumed to occur on the A1/A2 sites. This resulted in a minor reduction of the c lattice parameter, and unit cell volume. For undoped CBN28, there was a slightly diffuse relative permittivity-temperature (εr-T) peak at 268 ⁰C. The peak became much broader for sample compositions w = 0.04 and 0.05 and the peak temperature showed a level of frequency dependence consistent with weak relaxor behaviour. The polarisation-electric field loops became narrower for samples w = 0.04 and 0.05, corresponding to a reduction in remnant polarisation value, from 2.4 to 0.8 µC cm−2 (30 kV cm−1). The Y doped ceramics exhibited stable relative permittivity over a wide temperature range, the variation being within± 15% of the median value from 36 ⁰C to 218 ⁰C for w = 0.05, when measured at 1 kHz. Consequently, we suggest that A site donor-doping and aliovalent B site doping of CBN holds potential for industry standard, temperature stable, high temperature dielectrics (ɛr ≥ 500 ± 15% from - 55–250 + ⁰C).
Metadata
Item Type: | Article | ||||||
---|---|---|---|---|---|---|---|
Authors/Creators: |
|
||||||
Copyright, Publisher and Additional Information: | © 2023 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. | ||||||
Keywords: | Ceramics, Ferroelectrics, Dielectric response, Tungsten-bronze | ||||||
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: |
|
||||||
Depositing User: | Symplectic Publications | ||||||
Date Deposited: | 18 Apr 2023 09:35 | ||||||
Last Modified: | 25 Jun 2023 23:19 | ||||||
Status: | Published | ||||||
Publisher: | Elsevier | ||||||
Identification Number: | https://doi.org/10.1016/j.jallcom.2023.169891 |
Commentary/Response Threads
- Peirson, H, Pan, J, Li, Y, Hall, DA, Brown, AP, Drummond-Brydson, RM and Milne, SJ Structure and dielectric properties of yttrium-doped Ca0.28Ba0.72Nb2O6 ceramics. (deposited 18 Apr 2023 09:35) [Currently Displayed]