High-temperature superconductivity has gained renewed attention following recent reports of the onset of superconductivity above 100 K in oxide systems containing copper, alkaline earths and bismuth1 or thallium2–4. The superconducting oxide in the Bi–Sr–Ca–Cu–O system has been identified as Bi2Sr3–xCaxCu2O8, and its structure comprises pairs of CuO2 sheets, interleaved by Ca(Sr), alternating with double bismuth-oxide layers5–7, Hazen et al.8 have identified two new superconducting phases, Tl2Ba2Ca2Cu3O10 (2223) and Tl2Ba2CaCu2O8 (2212), both with tetragonal or pseudotetragonal structures that are probably related to the structure of Bi2Sr3–xCaxCu2O8. Here we present X-ray diffraction data for a single crystal of the 2212 phase, which has an onset temperature of ∼112 K. The crystal structure, based on a body-centred tetragonal cell with a =3.8550(6) Å and c = 29.318(4) Å (space group I4/mmm), is essentially the same as that of Bi2Sr3–xCaxCu2O8 and comprises double copper-oxygen sheets alternating with double thallium-oxygen layers. There are Ca2+ cations between adjacent Cu–O sheets and Ba2+ cations between the Cu–O and Tl–O layers. The copper–oxygen chains present in YBa2Cu3O7 are absent in Tl2Ba2CaCu2O8.
Access optionsAccess options
Subscribe to Journal
Get full journal access for 1 year
only $3.90 per issue
All prices are NET prices.
VAT will be added later in the checkout.
Rent or Buy article
Get time limited or full article access on ReadCube.
All prices are NET prices.
Maeda, M., Tanaka, Y., Fukutomi, M. & Asano, T. Jap. J. appl. Phys. 27, L209–L210 (1988).
Sheng, Z. Z. & Hermann, A. M. Nature 332, 55–58 (1988).
Sheng, Z. Z. & Hermann, A. M. Nature 332, 138–139 (1988).
Hazen, R. M. et al. Phys. Rev. Lett. (in the press).
Subramanian, M. A. et al. Science 239, 1015–1017 (1988).
Sunshine, S. A. et al. Phys. Rev. Lett. (submitted).
Tarascon, J. M. et al. Phys. Rev. B (submitted).
Hazen, R. M. et al. Phys. Rev. Lett. (submitted).
Shannon, R. D. Acta crystallogr. A32, 751–767 (1976).
Fueki, K. et al. in Chemistry of High-Temperature Superconductors (eds Nelson, D. L., Whittingham, M. S. & George, T. F.) 38–48 (American Chemical Society, Washington, 1987).
Subramanian, M. A. et al. Science (in the press).
Torardi, C. C. et al. in Chemistry of High-Temperature Superconductors (eds Nelson, A. L., Whittingham, M. S. & George, T. F.) 152–163 (American Chemical Society, Washington, 1987).
Torardi, C. C. et al. Nature (submitted).
About this article
Effect of Oxygen Treatment on the Structural and Electrical Properties of Tl0.85Cd0.15Sr2CuO5−δ , Tl0.85Cd0.15Sr2Ca2Cu2 O 7−δ and Tl0.85Cd0.15Sr3Ca2Cu3 O 9−δ Superconductors
Journal of Superconductivity and Novel Magnetism (2017)
Investigation of the relationship betweenT c and the Coulomb interaction of copper cations from the neighboring CuO2 layers
Journal of Structural Chemistry (1999)