Defect ordering in YBa2Cu3O6.5 and YBa2Cu3O6.6: synthesis and characterization by neutron and electron diffraction

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TypeArticle
Journal titleJournal of Solid State Chemistry
Volume84
Issue2
Pages226336; # of pages: 8
AbstractPolycrystalline samples of YBa2Cu3O6.5 and YBa2Cu3O6.6 were prepared by oxygen titration of YBa2 Cu3O6.0 at 450°C followed by slow cooling to room temperature. Both samples showed evidence for thea′ = 2a supercell in individual grains by electron diffraction as reported previously. In addition the superlattice was observed in neutron powder diffraction indicating that the bulk material is also well ordered. In this study the YBa2Cu3O6.6 phase showed longer correlation lengths for ordering along botha* andb* than YBa2Cu3O6.5. For the former compound the powder-averaged, sample-averageda* correlation distance is 26Aofrom neutron diffraction. Analysis of electron diffraction profiles on selected single crystals give correlation lengths alonga*, b*, andc* of 100, 200, and 50Ao, respectively. Dark field imaging discloses the presence of striped, ordered domains elongated alongb* with a distribution of sizes. Both neutron diffraction and dark field imaging indicate that the volume fraction of the ordered domains is about 50%. A correlation is noted between the Meissner Effect and the extent of defect ordering in the bulk samples of the two phases.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology
Peer reviewedYes
NRC number52180
NPARC number16187149
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Record identifier554d2cd4-4480-4310-9ef9-6004ca6a2e7a
Record created2010-10-20
Record modified2016-05-09
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