Site selectivity and cation diffusion in YBa sub 2 Cu sub 3 O sub 7 minus. delta

Tracer diffusion of Co, Zn, and Cu has been studied in polycrystals of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} from 600 to 950 {degree}C at an oxygen partial pressure of 1 atm using serial sectioning or the secondary-ion mass spectrometry technique. The present and previously published values of t...

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Bibliographic Details
Published in:Physical review. B, Condensed matter Condensed matter, 1991-03, Vol.43:7
Main Authors: Routbort, J.L., Rothman, S.J., Chen, N., Mundy, J.N., Baker, J.E.
Format: Article
Language:English
Subjects:
ALKALINE EARTH METAL COMPOUNDS
ATOM TRANSPORT
BARIUM COMPOUNDS
BARIUM OXIDES
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
COBALT
COPPER
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DIFFUSION
ELEMENTS
HIGH TEMPERATURE
HIGH-TC SUPERCONDUCTORS
IONS
MASS SPECTROMETERS
MATERIALS SCIENCE
MEASURING INSTRUMENTS
METALS
NEUTRAL-PARTICLE TRANSPORT
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
RADIATION TRANSPORT
SPECTROMETERS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE
YTTRIUM COMPOUNDS 360204 > Ceramics, Cermets, & Refractories-- Physical Properties
YTTRIUM OXIDES
ZINC
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Summary:Tracer diffusion of Co, Zn, and Cu has been studied in polycrystals of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} from 600 to 950 {degree}C at an oxygen partial pressure of 1 atm using serial sectioning or the secondary-ion mass spectrometry technique. The present and previously published values of the diffusion coefficient of Cu fall on the same Arrhenius line. The diffusion coefficients of Zn and Cu and published values for Ni are close to each other and the activation energies are almost the same. Measurements of diffusion of Co and Ni in single-crystal {ital c}-axis platelets indicate a much greater diffusional anisotropy for Co than for Ni. Diffusion coefficients of Cu are less than published diffusion coefficients of Ag, possibly because Ag attracts oxygen-ion vacancies. The interaction between cations and oxygen vacancies can explain the increase in the diffusion of Cu with decreasing {ital P}{sub O2} at 850 {degree}C.
ISSN:0163-1829
1095-3795
DOI:10.1103/PhysRevB.43.5489