Co and Fe substitution in YBa2Cu3O7/sub -//sub δ/
- 1. Center for Materials Science and Engineering, The University of Texas at Austin, Austin, Texas 78712
Description
The limiting substitution of Co or Fe for Cu in the orthorhombic superconducting phase YBa2Cu3O7/sub -//sub δ/ yields the tetragonal, semiconducting compositions YBa2Cu2CoO/sub 7.25/ and YBa2Cu/sub 2.5/Fe/sub 0.5/O/sub 7.19/ after annealing at 400 0C and slow cooling in O2. Single-crystal x-ray structural analyses, conductivity and magnetic-susceptibility measurements, and thermogravimetric analysis (TGA) data provide evidence for Co or Fe substitution at the Cu(1) position and intercalation of peroxide ions (O2)2-. The two compositions decompose for disintercalation of oxygen beyond O/sub 6.7/ for Co and O/sub 6.4/ for Fe when heated in N2. The Cu(2) atoms of tetragonal YBa2Cu3O6 appear to be antiferromagnetic below a T/sub N/≅240 K, which is similar to comparable Cu--O planar nets in stoichiometric La2CuO4
Additional details
Publishing Information
- Journal Title
- J. Mater. Res.
- Journal Volume
- 3
- Journal Issue
- 2
- Series
- J. Mater. Res.
- Journal Page Range
- 248-256
- ISSN
- 0884-2914
- CODEN
- JMREE
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 19058026
- Subject category
- S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ANTIFERROMAGNETISM; BARIUM OXIDES; COBALT OXIDES; COPPER OXIDES; CRYSTAL STRUCTURE; ELECTRIC CONDUCTIVITY; EXPERIMENTAL DATA; IRON OXIDES; LOW TEMPERATURE; MAGNETIC SUSCEPTIBILITY; MEDIUM TEMPERATURE; MONOCRYSTALS; SUPERCONDUCTIVITY; TETRAGONAL LATTICES; THERMAL GRAVIMETRIC ANALYSIS; VALENCE; X-RAY DIFFRACTION; YTTRIUM OXIDES
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CHALCOGENIDES; CHEMICAL ANALYSIS; COBALT COMPOUNDS; COHERENT SCATTERING; COPPER COMPOUNDS; CRYSTAL LATTICES; CRYSTALS; DATA; DESTRUCTIVE ANALYSIS; DIFFRACTION; ELECTRICAL PROPERTIES; GRAVIMETRIC ANALYSIS; INFORMATION; IRON COMPOUNDS; MAGNETIC PROPERTIES; MAGNETISM; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; QUANTITATIVE CHEMICAL ANALYSIS; SCATTERING; THERMAL ANALYSIS; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS