Phase relations in the composition (Pb sub 1-y Cu sub y )Sr sub 2 (Ln sub 1-x Ca sub x )Cu sub 2 O sub 7 and the crystal structure of La sub 8-x Sr sub x Cu sub 8-y O sub 20
Journal Article
·
· Journal of Solid State Chemistry; (USA)
- Univ. of Texas, Austin (USA)
The compound (Pb{sub 0.71}Cu{sub 0.29})Sr{sub 2}(Ln{sub 1-x}Ca{sub x})Cu{sub 2}O{sub 7} (1212) has been synthesized as single phase material for La, Pr, Nd, Gd, Er, and Y from the proper starting compositions fired above 950{degree}C. The crystal structure of a crystal found in a reaction product from a nominal mixture PbSr{sub 2}LaCu{sub 2} (1212) fired at 1050{degree}C was determined from three-dimensional X-ray diffraction data, Its composition is (La{sub 6.16}Sr{sub 1.84})Cu{sub 7.66}O{sub 20}, M{sub r} = 1823.6, tetragonal, P4/mbm, a = 10.7468(8) {angstrom}, c = 3.8633(3) {angstrom}, V = 446.2(1) {angstrom}{sup 3}, Z = 1, D{sub x} = 6.79 g cm{sup {minus}3}, {lambda} = 0.71069 {angstrom}, {mu} = 288.0 cm{sup {minus}1}, R = 0.032, wR = 0.034 for 385 observed reflections. The two apical Cu1-O bond lengths are 1.9317(1) {angstrom}, and the four equatorial lengths are 1.978(7) {angstrom}. The square Cu2-O bond lengths are 1.9317(1) and 1.869(6) {angstrom} respectively.
- OSTI ID:
- 7198403
- Journal Information:
- Journal of Solid State Chemistry; (USA), Journal Name: Journal of Solid State Chemistry; (USA) Vol. 84:2; ISSN 0022-4596; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BERYLLIUM COMPOUNDS
CALCULATION METHODS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DATA
DATA ANALYSIS
ELEMENTS
ERBIUM
EXPERIMENTAL DATA
GADOLINITE
GADOLINIUM
INFORMATION
IRON COMPOUNDS
LANTHANUM
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NEODYMIUM
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PRASEODYMIUM
RARE EARTH COMPOUNDS
RARE EARTHS
SILICATES
SILICON COMPOUNDS
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BERYLLIUM COMPOUNDS
CALCULATION METHODS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DATA
DATA ANALYSIS
ELEMENTS
ERBIUM
EXPERIMENTAL DATA
GADOLINITE
GADOLINIUM
INFORMATION
IRON COMPOUNDS
LANTHANUM
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NEODYMIUM
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PRASEODYMIUM
RARE EARTH COMPOUNDS
RARE EARTHS
SILICATES
SILICON COMPOUNDS
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM