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Cation vacancies in perovskites doped with La and Gd
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Vance, Eric R., Hanna, John V. and Hadley, J. H. (2012) Cation vacancies in perovskites doped with La and Gd. Advances in Applied Ceramics, Vol. 111 (No. 1). pp. 94-98. doi:10.1179/1743676111Y.0000000037 ISSN 17436753.
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Official URL: http://dx.doi.org/10.1179/1743676111Y.0000000037
Abstract
Whereas doping CaTiO3 or SrTiO3 with ∼0·05 formula units (f.u.) of trivalent rare earth ions substituted for Ca can yield majority positron annihilation lifetime τ 1 increases of up to 30% due to the presence of cation vacancies, similar doping of BaTiO3 produces increases of only ∼10%. The difference is attributed to hole trapping around cation vacancies in BaTiO3. The absence of significant changes to τ 1 for La doped CaTiO3 when oxidised samples are reduced by sintering in a hydrogenous atmosphere is attributed to the formation of oxygen vacancies that co-exist with the original cation vacancies. Solid state nuclear magnetic resonance showed that a significant fraction of the La ions in BaTiO3 containing 0·04 f.u. of La were in cubic coordination, irrespective of the charge compensation scheme employed. Doping of sintered SrTiO3 with La to produce up to 0·2 f.u. of Sr cation vacancies had no significant effect on Sr leaching in deionised water at 90°C.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Positron annihilation, Perovskite, Nuclear magnetic resonance, Leaching, Lanthanum, Gadolinium | ||||
Journal or Publication Title: | Advances in Applied Ceramics | ||||
Publisher: | Maney Publishing | ||||
ISSN: | 17436753 | ||||
Official Date: | 2012 | ||||
Dates: |
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Volume: | Vol. 111 | ||||
Number: | No. 1 | ||||
Page Range: | pp. 94-98 | ||||
DOI: | 10.1179/1743676111Y.0000000037 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
Data sourced from Thomson Reuters' Web of Knowledge
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