Mixed ionic-electronic conduction in K1/2Bi1/2TiO3
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 inte...
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| Format: | Article |
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Royal Society of Chemistry
2017
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| Online Access: | https://eprints.nottingham.ac.uk/50087/ |
| _version_ | 1848798149918851072 |
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| author | Li, Linhao Li, Ming Reaney, Ian M. Sinclair, Derek C. |
| author_facet | Li, Linhao Li, Ming Reaney, Ian M. Sinclair, Derek C. |
| author_sort | Li, Linhao |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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 similar 0.5 at 600-800 degreeC and although variations in the A-site starting stoichiometry can create a similar1 order of magnitude difference in the bulk conductivity at >500 degree C, the conductivity is low (ca. 0.1 to 1 mS cm-1 at 700 degree C) and the activation energy for bulk conduction remains in the range similar1.2 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 degree C). For K/Bi greater-than-or-equal 1 the total conductivity of KBT ceramics at room temperature can be as high as similar0.1 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. |
| first_indexed | 2025-11-14T20:15:11Z |
| format | Article |
| id | nottingham-50087 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T20:15:11Z |
| publishDate | 2017 |
| publisher | Royal Society of Chemistry |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-500872024-08-15T15:23:18Z https://eprints.nottingham.ac.uk/50087/ Mixed ionic-electronic conduction in K1/2Bi1/2TiO3 Li, Linhao Li, Ming Reaney, Ian M. Sinclair, Derek C. 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 similar 0.5 at 600-800 degreeC and although variations in the A-site starting stoichiometry can create a similar1 order of magnitude difference in the bulk conductivity at >500 degree C, the conductivity is low (ca. 0.1 to 1 mS cm-1 at 700 degree C) and the activation energy for bulk conduction remains in the range similar1.2 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 degree C). For K/Bi greater-than-or-equal 1 the total conductivity of KBT ceramics at room temperature can be as high as similar0.1 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. Royal Society of Chemistry 2017-07-07 Article PeerReviewed Li, Linhao, Li, Ming, Reaney, Ian M. and Sinclair, Derek C. (2017) Mixed ionic-electronic conduction in K1/2Bi1/2TiO3. Journal of Materials Chemistry C, 5 (25). pp. 6300-6310. ISSN 2050-7526 http://pubs.rsc.org/en/Content/ArticleLanding/2017/TC/C7TC01786C#!divAbstract doi:10.1039/C7TC01786C doi:10.1039/C7TC01786C |
| spellingShingle | Li, Linhao Li, Ming Reaney, Ian M. Sinclair, Derek C. Mixed ionic-electronic conduction in K1/2Bi1/2TiO3 |
| title | Mixed ionic-electronic conduction in K1/2Bi1/2TiO3 |
| title_full | Mixed ionic-electronic conduction in K1/2Bi1/2TiO3 |
| title_fullStr | Mixed ionic-electronic conduction in K1/2Bi1/2TiO3 |
| title_full_unstemmed | Mixed ionic-electronic conduction in K1/2Bi1/2TiO3 |
| title_short | Mixed ionic-electronic conduction in K1/2Bi1/2TiO3 |
| title_sort | mixed ionic-electronic conduction in k1/2bi1/2tio3 |
| url | https://eprints.nottingham.ac.uk/50087/ https://eprints.nottingham.ac.uk/50087/ https://eprints.nottingham.ac.uk/50087/ |