Thermal-expansion mismatch and intergrowth types in the system La sub 2-y Nd sub y CuO sub 4
- Univ. of Texas, Austin (United States)
Stabilization of intergrowth structures of the copper-oxide superconductors requires bond-length matching across the intergrowth interface. The influence of thermal-expansion mismatch on the stabilization of T/O vs T{prime} intergrowths in the La{sub 2-y}Nd{sub y}CuO{sub 4} system is demonstrated by firing the coprecipitated hydroxides/carbonates at 500-1050C. A larger thermal expansion for the (LaNd)-O bond compared to that for the Cu-O bond shifts the T/O-T{prime} phase boundary to a higher y value in La{sub 2-y}Nd{sub y}CuO{sub 4} as the synthesis temperature is increased. Above 950C, an equilibrium phase diagram is obtained with a new line phase T{double prime} appearing at y=0.5. The T{double prime} phase appears to be an ordered variant of the T{prime} phase and could be doped neither n-type nor p-type.
- OSTI ID:
- 7294069
- Journal Information:
- Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 92:1; ISSN 0022-4596; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIAGRAMS
DIFFRACTION
EXPANSION
GRAVIMETRIC ANALYSIS
IONS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHASE STUDIES
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
SCATTERING
SUPERCONDUCTORS
SYNTHESIS
TEMPERATURE EFFECTS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THERMAL ANALYSIS
THERMAL EXPANSION
THERMAL GRAVIMETRIC ANALYSIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION