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Oxygen Tracer Diffusion in LA(z-x) SR(X) CUO(4-y) Single CrystalsThe tracer diffusion of O-18 in La(2-x)Sr(x)CuO(4-y) single crystals (x = 0 to 0.12) has been measured from 400 to 700 C in 1 atm of oxygen using SIMS analysis. Evidence for diffusion by a vacancy mechanism was found at low strontium contents. Oxygen diffusivities for x greater than or = 0.07 were depressed by several orders of magnitude below the diffusivity for undoped La2CuO(4+/-y). The observed effects of strontium doping on oxygen diffusivity are discussed in terms of defect chemical models. The decreasing oxygen diffusivity with increasing strontium was attributed to the ordering of oxygen vacancies at large defect concentrations. A diffusion anisotropy D(sub ab)/D(sub c) of nearly 600 was also found at 500 C.
Document ID
19950034936
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Opila, Elizabeth J.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Tuller, Harry L.
Wuensch, Berhardt J.
Maier, Joachim
Date Acquired
August 16, 2013
Publication Date
September 1, 1993
Publication Information
Publication: Journal of the American Ceramic Society
Volume: 76
Issue: 9
ISSN: 0002-7820
Subject Category
Solid-State Physics
Accession Number
95A66535
Distribution Limits
Public
Copyright
Other

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