Guo, M., Masó, N. orcid.org/0000-0003-0792-3943, Liu, Y. et al. (1 more author) (2018) Electrical properties and oxygen stoichiometry of Ba1-xSrxTiO3-δ ceramics. Inorganic Chemistry, 57 (1). pp. 64-71. ISSN 0020-1669
Abstract
Ba1-xSrxTiO3 solid solutions prepared by a solid-state reaction in air at 1200-1400 °C, followed by slow cooling to room temperature at the end of the reaction, were essentially oxygen-stoichiometric and p-type. Their conductivity increased reversibly when either p(O2) in the surrounding atmosphere was increased or a dc bias as small as 1 V was applied across the samples. The enhanced p-type conductivity is attributed to the creation of mobile holes on underbonded oxide ions. The same samples quenched from >∼1400 °C were increasingly oxygen deficient and n-type. They showed reduced conductivity with either a dc bias or increased p(O2), attributed to the trapping of mobile electrons. These materials provide a rare example of a switch between n-type and p-type conductivity, in the same material, linked to oxygen stoichiometry variation. In both n- and p-type materials, the samples responded to external stimuli in a way similar to that of a leaky capacitor; polarization processes at sample surfaces led first to charge storage and second to a reversible change in bulk electrical properties.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This document is the Accepted Manuscript version of a Published Work that appeared in final form in Inorganic Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.inorgchem.7b01827. |
Keywords: | Electrical conductivity; Electrical properties; Ions; Oxides; Oxygen |
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) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 15 Jan 2018 15:10 |
Last Modified: | 15 Mar 2024 15:44 |
Status: | Published |
Publisher: | American Chemical Society |
Refereed: | Yes |
Identification Number: | 10.1021/acs.inorgchem.7b01827 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:126250 |