Identifying open-volume defects in doped and undoped perovskite-type LaCoO{sub 3}, PbTiO{sub 3}, and BaTiO{sub 3}

Journal Article · Sat Jan 01 00:00:00 EST 2000 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.61.207· OSTI ID:20215079

Ghosh, Vinita J ^[1]; Nielsen, Bent ^[1]; Friessnegg, Thomas ^[2]

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1. Brookhaven National Laboratory, Upton, New York 11973 (United States)
2. University of Maryland, College Park, Maryland 20742 (United States)

Dopants, vacancies, and impurity-vacancy clusters have a substantial impact on the properties of perovskite-type metal oxides (general formula ABO{sub 3}). In order to determine synthesis and processing conditions that optimize the desirable properties of these materials a careful study of these defects is required. It is essential to identify the defects and to map the defect densities. Positron annihilation spectroscopy has often been used to identify vacancy-type defects. Calculations of the positron lifetime and Doppler-broadened profiles of the positron-electron annihilation radiation in undoped and doped LaCoO{sub 3}, PbTiO{sub 3}, and BaTiO{sub 3} are reported, and compared with available experimental data. The results show that these positron techniques are excellent for studying open-volume defects, vacancy-impurity complexes, and for identifying the sublattice occupied by the dopants. (c) 2000 The American Physical Society.

• OSTI ID: 20215079
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 61, Issue 1; Other Information: PBD: 1 Jan 2000; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
VACANCIES
ANNIHILATION
CRYSTAL DOPING
IMPURITIES
LANTHANUM OXIDES
LEAD OXIDES
PEROVSKITES
TITANIUM OXIDES
COBALT OXIDES
TITANATES
ELECTRONIC STRUCTURE
BARIUM OXIDES
FERROELECTRIC MATERIALS
EXPERIMENTAL DATA
THEORETICAL DATA