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

Aranda, M.A.G.; Sinclair, D.C.; Attfield, J.P.; Mackenzie, A. P.

doi:10.1103/PhysRevB.51.12747

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Cation distributions and possible phase separation in Tl₂Ba₂CuO_6+δ from synchrotron powder x-ray diffraction

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Aranda, M., Sinclair, D., Attfield, J., & Mackenzie, A. P. (1995). Cation distributions and possible phase separation in Tl₂Ba₂CuO_6+δ from synchrotron powder x-ray diffraction. Physical Review B, 51(18), 12747-12753. doi:10.1103/PhysRevB.51.12747.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-EC88-5

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.