Lead diffusion and segregation in Pb-doped Bi-2223 superconductors
Description
The isothermal annealing behavior of the Pb-doped BPSCCO 2223 superconductor in ambient oxygen at various temperatures (650 to 800 C) is studied systematically by in-situ resistivity measurement, thermogravimetrical analysis (TGA), transmission electron microscope observation (TEM), X-ray diffraction analysis (XRD), and electron probe micro analysis (EPMA). It is found that upon annealing under oxidizing conditions a Ca2PbO4-like phase is formed, the sample weight and resistivity increase, and the modulated structure is changed from Pb-type to Bi-type gradually. Based on these experimental results, a two-dimensional diffusion model of Pb2+ in Bi2-O2 planes is proposed, and the activation energy for Pb2+ diffusion is determined to be 1.47 eV. (orig.)
Additional details
Publishing Information
- Journal Title
- Physica Status Solidi. A, Applied Research
- Journal Volume
- 153
- Journal Issue
- 2
- Journal Page Range
- p. 355-365.
- ISSN
- 0031-8965
- CODEN
- PSSABA
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 27040698
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ANNEALING; BISMUTH OXIDES; CALCIUM OXIDES; COPPER OXIDES; DIFFUSION; DOPED MATERIALS; HIGH-TC SUPERCONDUCTORS; LEAD OXIDES; MICROSTRUCTURE; OXIDATION; SEGREGATION; STRONTIUM OXIDES; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0400-1000 K; TEMPERATURE RANGE 1000-4000 K; THERMAL ANALYSIS; THERMODYNAMIC PROPERTIES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; BISMUTH COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; CHEMICAL REACTIONS; COHERENT SCATTERING; COPPER COMPOUNDS; CRYSTAL STRUCTURE; DIFFRACTION; ELECTRON MICROSCOPY; HEAT TREATMENTS; LEAD COMPOUNDS; MATERIALS; MICROSCOPY; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SCATTERING; STRONTIUM COMPOUNDS; SUPERCONDUCTORS; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS