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Diffusion coefficients of oxygen in Nd sub 2 CuO sub 4 minus. delta

Journal Article · · Journal of Solid State Chemistry; (United States)
; ;  [1]
  1. Science Univ. of Tokyo (Japan)
+ Show Author Affiliations
The chemical diffusion in Nd{sub 2}CuO{sub 4-{delta}} was measured by means of a thermomicrobalance in a temperature range of 650 to 900C under oxygen pressure of 1 to 0.01 atm, using dense polycrystalline specimens. It was found that the relaxation after a step change in oxygen pressure from 0.3 to 0.01 atm was exponential, and the reduction rate coincided with that of oxidation. From this result, the relaxation was concluded to obey diffusion-controlled kinetics, and the chemical diffusion coefficient was determined. The self-diffusion coefficient of oxygen and the oxygen vacancy diffusion coefficient were calculated from the chemical diffusion coefficient. The self-diffusion coefficient of oxygen in Nd{sub 2}CuO{sub 4{minus}{delta}} was slightly larger than that in perovskites, and lower than that of YBa{sub 2}Cu{sub 3}O{sub 6.4}. The vacancy diffusion coefficient of Nd{sub 2}CuO{sub 4{minus}{delta}} is almost the same as that of perovskite-type oxides.
OSTI ID:
6114596
Journal Information:
Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 92:2; ISSN 0022-4596; ISSN JSSCB
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
ANNEALING
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DATA
DIFFRACTION
DIFFUSION
ELECTRON MICROSCOPY
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
GRAVIMETRIC ANALYSIS
HEAT TREATMENTS
INFORMATION
KINETICS
LOW PRESSURE
MATHEMATICAL MODELS
MICROANALYSIS
MICROSCOPY
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NONMETALS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POINT DEFECTS
POLYCRYSTALS
PRESSURE DEPENDENCE
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
REACTION KINETICS
REDUCTION
SCANNING ELECTRON MICROSCOPY
SCATTERING
SELF-DIFFUSION
STOICHIOMETRY
SUPERCONDUCTORS
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TRANSITION ELEMENT COMPOUNDS
VACANCIES
X-RAY DIFFRACTION