Structures of the superconducting oxides Tl/sub 2/Ba/sub 2/CuO/sub 6/ and Bi/sub 2/Sr/sub 2/CuO/sub 6/

Journal Article · Fri Jul 01 04:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.225· OSTI ID:6952756

Torardi, C C; Subramanian, M A; Calabrese, J C; Gopalakrishnan, J; McCarron, E M; Morrissey, K J; Askew, T R; Flippen, R B; Chowdhry, U; Sleight, A W; others, and

The structures of Tl/sub 2/Ba/sub 2/CuO/sub 6/ and Bi/sub 2/Sr/sub 2/CuO/sub 6/ have been solved and refined from single-crystal x-ray diffraction data. The structures are essentially the same and have single Cu-O sheets separated by either Tl-O or Bi-O double layers. The Tl/sub 2/Ba/sub 2/CuO/sub 6/ structure is tetragonal with a = 3.87 A and c = 23.24 A, and there are strictly flat Cu-O sheets. Bi/sub 2/Sr/sub 2/CuO/sub 6/ has a lower-symmetry structure which may be approximated with an orthorhombic cell with a = 5.36 A, b = 5.37 A, and c = 24.62 A; however, this ignores superstructure reflections along both the a and c axes. The Tl-O layers are much more strongly bound to each other than are the Bi-O layers; thus, better conduction along the c axis is expected for Tl/sub 2/Ba/sub 2/CuO/sub 6/ relative to Bi/sub 2/Sr/sub 2/CuO/sub 6/. Superconducting transition temperatures of 9 and 90 K were observed for Bi/sub 2/Sr/sub 2/CuO/sub 6/ and Tl/sub 2/Ba/sub 2/CuO/sub 6/, respectively.

• Research Organization: Central Research and Development Department, E. I. du Pont de Nemours Company, Experimental Station, Wilmington, Delaware 19898
• OSTI ID: 6952756
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:1; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CERAMICS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION