Metal ion and oxygen vacancies in bulk and thin film La1-xSrxCoO3
Creators
- 1. Department of Materials Science and Nuclear Engineering, University of Maryland, College Park, Maryland 20742 (United States)
- 2. Division of Materials Science, Brookhaven National Laboratory, Upton, New York 11973 (United States)
- 3. Carnegie Laboratory of Physics, University of Dundee, Dundee DD1 4HN (United Kingdom)
- 4. Army Research Laboratory, Adelphi, Maryland 20783 (United States)
- 5. Centre for Electrophotonic Materials and Devices, Department of Engineering Physics, McMaster University, Hamilton, Ontario, L8S 4L7 (CANADA)
Description
Positron-lifetime and depth-resolved Doppler-broadening spectroscopy were used to investigate vacancies formed in bulk and laser ablated thin film La1-xSrxCoO3. In bulk samples, metal ion vacancies, which are most likely situated in the La sublattice, show a lifetime of 219 ps and a Doppler-broadening S parameter 1.06 times higher than the bulk. The metal-ion vacancy concentration increases with increasing Sr content. For x≥0.3, oxygen vacancies are detected, yielding a positron lifetime of 149 ps, only 10 ps longer than the bulk lifetime; the S parameter is 4% higher than for the bulk. For a given Sr concentration the films show a higher defect density than the bulk samples. The introduction of oxygen vacancy related defects is observed for increasing Sr doping concentration for both film and bulk samples. In films these defects probably consist of larger clusters and/or form complexes with metal ion vacancies. copyright 1999 The American Physical Society
Additional details
Publishing Information
- Journal Title
- Physical Review. B, Condensed Matter
- Journal Volume
- 59
- Journal Issue
- 20
- Journal Page Range
- p. 13365-13369
- ISSN
- 0163-1829
- CODEN
- PRBMDO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 30038315
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- CHEMICAL COMPOSITION; COBALT OXIDES; DOPPLER BROADENING; LANTHANUM COMPOUNDS; LANTHANUM OXIDES; PEROVSKITES; POSITRONS; SEMICONDUCTOR MATERIALS; STRONTIUM COMPOUNDS; STRONTIUM OXIDES; THIN FILMS; VACANCIES
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; CHALCOGENIDES; COBALT COMPOUNDS; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; ELEMENTARY PARTICLES; FERMIONS; FILMS; LANTHANUM COMPOUNDS; LEPTONS; LINE BROADENING; MATERIALS; MATTER; MINERALS; OXIDES; OXYGEN COMPOUNDS; POINT DEFECTS; RARE EARTH COMPOUNDS; STRONTIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS