Cation distributions and possible phase separation in Tl2Ba2CuO6+δ from synchrotron powder x-ray diffraction

M A G ARANDA, D C SINCLAIR, J P ATTFIELD, A P MACKENZIE

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29 Citations (Scopus)

Abstract

Orthorhombic and tetragonal Tl2Ba2CuO6+δ (Tl-2201) samples have been studied using resonant synchrotron x-ray powder diffraction data at energies just below the Cu K and Tl LIII absorption edges. The resonant contributions enable us to demonstrate that Cu substitutes at the Tl site; the tetragonal structure is stabilized by a higher (5.5%) degree of substitution than the orthorhombic (<1%) material, in excellent agreement with electron probe microanalysis results. A slight splitting of some diffraction peaks of oxygen-rich orthorhombic Tl-2201 is consistent with a phase separation due to the segregation of interstitial oxygens.
Original languageEnglish
Pages (from-to)12747-12753
Number of pages7
JournalPhysical Review. B, Condensed matter
Volume51
Issue number18
DOIs
Publication statusPublished - 1 May 1995

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