Polytypoid structure of Pb-modified Bi-Ca-Sr-Cu-O superconductor

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.7070· OSTI ID:6781662

Ramesh, R; Thomas, G; Green, S; Jiang, C; Mei, Y; Rudee, M L; Luo, H L

Pb addition has been found to improve the superconducting properties of a Bi-Ca-Sr-Cu-O superconductor. We report zero resistance at 104 K in a Bi/sub 1.4/Pb/sub 0.6/Ca/sub 2/Sr/sub 2/Cu/sub 3/O/sub y/ alloy with no steps in the resistivity. Pb replaces Bi in the unit cell, as determined by x-ray microanalysis. The superconducting phase has the same structure as the alloy without lead, with the c parameter uniformly 38.2 A. The Cu + Ca content of these regions has also been found to be higher than in the undoped sample, indicating that the periodicity is determined by the composition leading to polytypoids. Such polytypoid structures appear to correlate well with the critical temperatures.

• Research Organization: Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
• OSTI ID: 6781662
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:10; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
LATTICE PARAMETERS
LEAD ADDITIONS
LEAD ALLOYS
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MICROANALYSIS
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION