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ChemInform Abstract: A New Monoclinic Phase of Superconducting Tl2Ba2CuO6+δ.

✍ Scribed by D. R. PEDERZOLLI; G. M. WLTSCHEK; J. P. ATTFIELD

Publisher
John Wiley and Sons
Year
2010
Weight
30 KB
Volume
28
Category
Article
ISSN
0931-7597

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✦ Synopsis

Tl-2201 superconductor is discovered by high-resolution time-of-flight neutron and synchrotron X-ray powder diffraction studies of "orthorhombic Tl-2201". Oxygen-rich compositions with Tc values up to 50 K are monoclinic whereas less oxidized samples with Tc values of 50-90 K are orthorhombic (Fmmm). The monoclinic to orthorhombic transition is due to a loss of interstitial oxygen whereas the orthorhombic transition to the tetragonal Tl-2201 phase at higher temp. involves the loss of Tl2O3 and the substitution of 5% Cu at the Tl site.

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