TlBa/sub 2/NdCu/sub 2/O/sub 7/ and TlBa/sub 2/YCu/sub 2/O/sub 7/ two non-superconductive oxides with the ''1212'' structure

Journal Article · Sun Jan 01 04:00:00 EST 1989 · Mod. Phys. Letters B; (United States)

DOI:https://doi.org/10.1142/S0217984989000169· OSTI ID:5763978

Martin, C; Bourgault, D; Michel, C; Hervieu, M; Raveau, B

Two new thallium cuprates isostructural with the ''1212'' superconductors were synthesized. These materials do not exhibit any superconductivity in spite of the presence of Tl(III), contrary to the oxides such as Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub 8/ or Tl/sub 2/Ba/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/. Their X-ray powder diffraction study confirms their close relationships with the superconductor TlBa/sub 2/CaCu/sub 2/O/sub 7/, i.e., their structure is built up from distorted double rock salt-type layers ((TlO) (BaO)) intergrown with oxygen deficient double perovskite layers (BaY(CuO/sub 2.5/)/sub 2/) or (BaNd(CuO/sub 2.5/)/sub 2/). Although the determination of the positions of the oxygen atoms cannot be considered as accurate, one significant difference with respect to TlBa/sub 2/Cu/sub 2/O/sub 7/ must be pointed out: the oxygen atoms forming the basal planes of the CuO/sub 5/ pyramids are brought closer together along c, leading to an almost cubic environment for Y and Nd, whereas the CaO/sub 8/ prisms are elongated along c in the thallium superconductors.

• Research Organization: Laboratoire de cristallographie et sciences des materiaux, ISMRa, Bd du Marechal Juin, 14032 CAEN, Cedex (FR)
• OSTI ID: 5763978
• Journal Information: Mod. Phys. Letters B; (United States), Journal Name: Mod. Phys. Letters B; (United States) Vol. 3:1; ISSN MPLBE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ATOM TRANSPORT
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
METALLURGY
MINERALS
NEUTRAL-PARTICLE TRANSPORT
NONMETALS
OXIDE MINERALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
PHASE STUDIES
PHYSICAL PROPERTIES
POWDER METALLURGY
RADIATION TRANSPORT
SCATTERING
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES