Annealing and structure studies on Tl-2223 and Tl-1223 crystals

Conference · Wed Oct 02 04:00:00 EDT 2002 · Physica. C, Superconductivity

DOI:https://doi.org/10.1016/0921-4534(91)92131-t· OSTI ID:5712667

Morosin, B. ^[1]; Venturini, E. L. ^[1]; Ginley, D. S. ^[1]

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1. Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Single crystals with nominal stoichiometry Tl₂Ca₂Ba₂Cu₃O₁₀ (Tl-2223) and TlCa₂Ba₂Cu₃O₉ (Tl-1223) have been annealed in flowing oxygen or nitrogen and the complete crystal structure determined by least-squares refinement of Mo Kα x-ray diffraction data. Small atomic displacements are found after the anneals that are consistent with a model in which small amounts of Tl¹⁺ present in the Tl O layer are subsequently reversibly oxidized/reduced during mild oxygen/nitrogen anneals to Tl³⁺. Despite substantial changes in oxygen content in the Tl O layers with annealing, Meissner data show very modest shifts in the superconducting transition temperature, suggesting little change in the carrier concentration in the Cu O₂ planes.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5712667
• Report Number(s): SAND--91-0771C; CONF-910736--4; ON: DE91014903
• Conference Information: Journal Name: Physica. C, Superconductivity Journal Volume: 185-189
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DIFFRACTION
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
OXIDES
OXYGEN COMPOUNDS
SCATTERING
STOICHIOMETRY
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION