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

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.5489· OSTI ID:5531908

Routbort, J L; Rothman, S J; Chen, N; Mundy, J N ^[1]; Baker, J E ^[2]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (USA)
2. Center for Microanalysis of Materials, University of Illinois, Urbana, Illinois 61801 (USA)

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.

• OSTI ID: 5531908
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:7; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

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CATIONS
CHALCOGENIDES
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COPPER
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COPPER OXIDES
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VERY HIGH TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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