Journal
ADVANCES IN APPLIED CERAMICS
Volume 111, Issue 1-2, Pages 94-98Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/1743676111Y.0000000037
Keywords
Positron annihilation; Vacancies; Perovskites; Nuclear Magnetic Resonance; Leaching
Categories
Funding
- Australian Research Council
Ask authors/readers for more resources
Whereas doping CaTiO3 or SrTiO3 with similar to 0.05 formula units (f.u.) of trivalent rare earth ions substituted for Ca can yield majority positron annihilation lifetime tau(1) increases of up to 30% due to the presence of cation vacancies, similar doping of BaTiO3 produces increases of only similar to 10%. The difference is attributed to hole trapping around cation vacancies in BaTiO3. The absence of significant changes to tau(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 degrees C.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available