Changes in Fe site occupancy and Tc in YBa sub 2 (Cu sub 1-x Fe sub x ) sub 3 O sub y through processing
Conference
·
OSTI ID:6895167
- California Univ., San Diego, CA (USA)
- Los Alamos National Lab., NM (USA) California Univ., San Diego, CA (USA)
- Los Alamos National Lab., NM (USA)
Fe substitution for Cu in YBa{sub 2}Cu{sub 3}O{sub y} can give information about the local environment on the two crystallographic Cu sites through Mossbauer effect measurements. In this paper, we explore the possibility of forcing larger amounts of Fe onto the Cu (2) site which represents the CuO planes. At values near y = 6, the chain Cu (1) site is characteristic for Cu{sup +} in its linear 0 coordination and should preclude Fe occupation. We therefore prepared materials at elevated temperatures under N{sub 2} where y {approximately}6. Oxygenation to y {approximately}7 was achieved at temperatures where metal diffusion is minimized. We used Mossbauer spectroscopy to determine the Fe site occupancy. Site preference can be expressed in terms of a distribution ratio r = MCul/ MCu2. Creating materials with low r allows studying the effects of spatially constrained Fe on T{sub c}, separating influences from the spatially more complex Cu (1) site.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- Sponsoring Organization:
- DOE/MA
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6895167
- Report Number(s):
- LA-UR-90-1402; CONF-900527--2; ON: DE90010614
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:6482598
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Journal Article
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Sat Nov 30 23:00:00 EST 1996
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OSTI ID:443687
Fe site occupancy and superconductivity in Y sub 1-z Ca sub z Ba sub z (Cu sub 1-x Fe sub x ) sub 3 O sub 6+y
Conference
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Sun Dec 31 23:00:00 EST 1989
·
OSTI ID:6899741
Related Subjects
36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
ELEMENTS
HIGH-TC SUPERCONDUCTORS
IRON
METALS
MODIFICATIONS
MOESSBAUER EFFECT
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
ELEMENTS
HIGH-TC SUPERCONDUCTORS
IRON
METALS
MODIFICATIONS
MOESSBAUER EFFECT
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS