Diffusion coefficients of oxygen in Nd2CuO4-δ
Description
The chemical diffusion in Nd2CuO4-δ 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 Nd2CuO4-δ was slightly larger than that in perovskites, and lower than that of YBa2Cu3O6.4. The vacancy diffusion coefficient of Nd2CuO4-δ is almost the same as that of perovskite-type oxides
Additional details
Publishing Information
- Journal Title
- Journal of Solid State Chemistry
- Journal Volume
- 92
- Journal Issue
- 2
- Series
- J. Solid State Chem.
- Journal Page Range
- 489-495
- ISSN
- 0022-4596
- CODEN
- JSSCB
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 23030330
- Subject category
- S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ANNEALING; CHEMICAL PREPARATION; CHEMICAL REACTION KINETICS; COPPER OXIDES; EXPERIMENTAL DATA; FABRICATION; LOW PRESSURE; MATHEMATICAL MODELS; MICROANALYSIS; NEODYMIUM OXIDES; OXIDATION; OXYGEN; POLYCRYSTALS; PRESSURE DEPENDENCE; REDUCTION; SCANNING ELECTRON MICROSCOPY; SELF-DIFFUSION; STOICHIOMETRY; SUPERCONDUCTORS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0400-1000 K; TEMPERATURE RANGE 1000-4000 K; THERMAL GRAVIMETRIC ANALYSIS; VACANCIES; X-RAY DIFFRACTION
- Descriptors DEC
- CHALCOGENIDES; CHEMICAL ANALYSIS; CHEMICAL REACTIONS; COHERENT SCATTERING; COPPER COMPOUNDS; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; CRYSTALS; DATA; DIFFRACTION; DIFFUSION; ELECTRON MICROSCOPY; ELEMENTS; GRAVIMETRIC ANALYSIS; HEAT TREATMENTS; INFORMATION; KINETICS; MICROSCOPY; NEODYMIUM COMPOUNDS; NONMETALS; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; POINT DEFECTS; QUANTITATIVE CHEMICAL ANALYSIS; RARE EARTH COMPOUNDS; REACTION KINETICS; SCATTERING; SYNTHESIS; TEMPERATURE RANGE; THERMAL ANALYSIS; TRANSITION ELEMENT COMPOUNDS