Li, L., Li, M., Reaney, I.M. et al. (1 more author) (2017) Mixed ionic-electronic conduction in K1/2Bi1/2TiO3. Journal of Materials Chemistry C, 5 (25). pp. 6300-6310. ISSN 2050-7526
Abstract
Recently, it has been reported that the Pb-free piezoelectric perovskite Na1/2Bi1/2TiO3 (NBT) can be compositionally tuned by close control of the A-site starting stoichiometry to exhibit high levels of oxide-ion conduction. The related K1/2Bi1/2TiO3 (KBT) perovskite has also drawn considerable interest as a promising Pb-free piezoelectric material; however, its conduction properties have been less extensively investigated. Here we report on the influence of the K/Bi ratio in the starting composition on the electrical properties using a combination of impedance spectroscopy and ion-transport property measurements. KBT ceramics exhibit mixed ionic–electronic (oxide-ion) conduction with tion ∼ 0.5 at 600–800 °C and although variations in the A-site starting stoichiometry can create a ∼1 order of magnitude difference in the bulk conductivity at >500 °C, the conductivity is low (ca. 0.1 to 1 mS cm−1 at 700 °C) and the activation energy for bulk conduction remains in the range ∼1.2 to 1.5 eV. The high temperature electrical transport properties of KBT are therefore much less sensitive to the starting A-site stoichiometry as compared to NBT. However, KBT ceramics exhibit non-negligible proton conduction at lower temperatures (<300 °C). For K/Bi ≥ 1 the total conductivity of KBT ceramics at room temperature can be as high as ∼0.1 mS cm−1 under wet atmospheric conditions. This study demonstrates ionic conduction to be a common feature in A1/2Bi1/2TiO3 perovskites, where A = Na, K.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © The Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence https://creativecommons.org/licenses/by/3.0/). |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) GR/S60037/01 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/J018112/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/F006098/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/J009628/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) NONE ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/I038934/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) 08-POC-1110 INNOVATE UK (TSB) KTP009057 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/I033319/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/G069069/1 KNOWLEDGE TRANSFER PARTNERSHIP KTP007053 DEFENCE SCIENCE AND TECHNOLOGY LABORATORY UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) GR/M33501 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) UNSPECIFIED FILTRONIC COMTEK LIMITED UNSPECIFIED MORGAN ADVANCED CERAMICS UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) UNSPECIFIED FILTRONIC COMTEK LIMITED UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/H048049/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) GR/R93599/01 KNOWLEDGE TRANSFER PARTNERSHIP KTP000531 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) GR/S60037/01 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) GR/S60037/01 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) GR/S60037/01 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/E057616/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) GR/S60037 UNIVERSITY OF MANCHESTER MAN/RF/01 AVX LTD UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/F015259/1 INNOVATE UK (TSB) KTP009683 KNOWLEDGE TRANSFER PARTNERSHIP KTP007023 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/D067049/1 EUROPEAN COMMISSION - FP6/FP7 NMP3-CT-2006-032644 KNOWLEDGE TRANSFER PARTNERSHIP UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) UNSPECIFIED LEVERHULME TRUST (THE) 10225/2 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/G005001/1 BC COMPONENTS INTERNATIONAL UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/F031475/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/E065783/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/E040578/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) UNSPECIFIED ROYAL SOCIETY OF CHEMISTRY UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/F026889/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/P015565/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) UNSPECIFIED EUROPEAN COMMISSION - FP6/FP7 UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/P015859/1 HER MAJESTYS GOVERNMENT COMMUNICATIONS UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/N032233/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/N008065/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/P025285/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/P02470X/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/N010493/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 27 Jul 2017 15:47 |
Last Modified: | 27 Jul 2017 15:53 |
Published Version: | https://doi.org/10.1039/c7tc01786c |
Status: | Published |
Publisher: | Royal Society of Chemistry |
Refereed: | Yes |
Identification Number: | 10.1039/c7tc01786c |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:119590 |