Characterization of the Bi sub 1. 6 Pb sub 0. 4 Sr sub 2 Ca sub 2 Cu sub 3 O sub y superconductor by x-ray diffraction, low-field microwave absorption, and electron spin resonance

Journal Article · · Chemistry of Materials; (United States)

OSTI ID:5237330

Cuvier, S; Puri, M; Bear, J; Kevan, L ^[1]

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1. Univ. of Houston, TX (USA)

X-ray diffraction (XRD) and low-field microwave absorption (LFMA) have been measured for a series of Bi{sub 1.6}Ph{sub 0.4}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} superconducting samples prepared at different sintering temperatures that display zero resistance between 50 and 98 K. Multiphase formation is observed in all samples. XRD results suggest that the fraction of the high-transition temperature ({Tc}) phase denoted as 2,223 grows with increasing sintering time and temperature compared to the low-{Tc} phase denoted as 2,212, although the 2,212 phase always predominates. Simultaneously, several impurity phases also increase. The 2,223 phase and 2,210 phase seem to be formed by the disproportionation of the 2,212 phase. The incorporation of Pb in the lattice accelerates this disproportionation process. LFMA signals reveal the presence of two superconducting phases with {Tc} close to 75 and 115 K. The intensity of the microwave absorption due to the low {Tc} phase is 3-6 times higher than that of the high {Tc} phase. No electron spin resonance signal has been detected for this superconducting system above or below {Tc}, which indicates the lack of paramagnetic impurity phases.

• OSTI ID: 5237330
• Journal Information: Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 3:1; ISSN CMATE; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTROSCOPY
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DATA
DIFFRACTION
ELECTRON MICROSCOPY
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
FABRICATION
HIGH-TC SUPERCONDUCTORS
INFORMATION
LEAD COMPOUNDS
LEAD OXIDES
MAGNETIC RESONANCE
MEASURING METHODS
MICROSCOPY
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RESONANCE
SCANNING ELECTRON MICROSCOPY
SCATTERING
SINTERING
SPECTROSCOPY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION