TY - JOUR
KW - High temperature superconductors
KW - Superconducting materials
KW - Magnetic properties
KW - Lattice parameters
KW - Oxide superconductors
KW - Microscopic Examination–Transmission Electron Microscopy
KW - Ceramic Materials–Electric Conductivity
KW - Lead Compounds–Electric Conductivity
KW - Lead Metallography–Microstructures
KW - Diamagnetic Properties
KW - Lead Strontium Calcium Erbium Copper Oxides
KW - Low Temperature Properties
AU - Ramamoorthy Ramesh
AU - E Wang
AU - L.H Greene
AU - M.S Hegde
AU - J.-M Tarascon
AB - The structure and microstructure of a solid state processed Pb-Sr-Ca-Er-Cu-O superconductor have been investigated by transmission electron microscopy. In addition to the majority superconducting phase, at least two other impurity phases have been observed. The superconducting phase is a layered structure similar to the Bi2Sr2CaCu2Cycompound, with an extra Cu atom between the two PbO layers. Stacking defects inside the grain have been observed. A grain boundary amorphous phase has also been observed. The steps in the resistivity-temperature plot and the consequent absence of Tc, 0 above 8 K are attributed to either the presence of the Pb2Sr2Cu2Oyunit cell at the grain boundary and/or a local enrichment of oxygen at the grain boundaries. Superlattice spots in the [100] zone axis diffraction patterns from regions enriched in Ca and Er with respect to the nominal composition are interpreted as due to ordering of Sr and Ca/Er in the Sr sites. © 1990, Materials Research Society. All rights reserved.
BT - Journal of Materials Research
DO - 10.1557/JMR.1990.0251
LA - eng
M1 - 2
N1 - cited By 2
N2 - The structure and microstructure of a solid state processed Pb-Sr-Ca-Er-Cu-O superconductor have been investigated by transmission electron microscopy. In addition to the majority superconducting phase, at least two other impurity phases have been observed. The superconducting phase is a layered structure similar to the Bi2Sr2CaCu2Cycompound, with an extra Cu atom between the two PbO layers. Stacking defects inside the grain have been observed. A grain boundary amorphous phase has also been observed. The steps in the resistivity-temperature plot and the consequent absence of Tc, 0 above 8 K are attributed to either the presence of the Pb2Sr2Cu2Oyunit cell at the grain boundary and/or a local enrichment of oxygen at the grain boundaries. Superlattice spots in the [100] zone axis diffraction patterns from regions enriched in Ca and Er with respect to the nominal composition are interpreted as due to ordering of Sr and Ca/Er in the Sr sites. © 1990, Materials Research Society. All rights reserved.
PY - 1990
SP - 251
EP - 257
T2 - Journal of Materials Research
TI - Electron Microscopy of the Pb-Sr-Ca-Er-Cu-O Superconductor
VL - 5
SN - 08842914
ER -