Effect of praseodymium on superconductivity and magnetism in Y[sub 1[minus]x]Pr[sub x]Ba[sub 2]Cu[sub 4]O[sub 8] prepared by nitrite pyrolysis method

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb08316.x· OSTI ID:6220076

Meen, Teenhang; Chen, Yingchung; Liaw, Kenwhie; Yang, Hungduen ^[1]

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1. National Sun Yat-Sen Univ., Kaohsiung (Taiwan, Province of China)

X-ray diffraction patterns shown that most samples of Y[sub 1[minus]x]Pr[sub x]Ba[sub 2]Cu[sub 4]O[sub 8] (1-2-4) superconductive phase for x < 0.7. Lattice parameters a and b increase with Pr concentration, suggesting that most of the Pr is trivalent in Y[sub 1[minus]x]Pr[sub x]Ba[sub 2]Cu[sub 4]O[sub 8]. The zero-resistance temperature, T[sub co], decreases monotonically from 80 K at x = 0 to 12 K at x = 0.65, and superconducting transition widths tend to broaden for x > 0. The room-temperature resistivity changes linearly until x = 0.7 and increases abruptly at x = 0.75. The critical concentration, x[sub cr], thus was estimated to be 0.7. The effective magnetic moments of Pr in Y[sub 1[minus]x]Pr[sub x]Ba[sub 2]Cu[sub 4]O[sub 8] were 3.63, 3.35, and 3.23 [mu][sub B] for x = 0.2, 0.4 and 0.6, respectively. In the R[sub 0.8]Pr[sub 0.2]Ba[sub 2]Cu[sub 4]O[sub 8] system, the depression of [Tc] weakly depends on the ionic radius of rare-earth elements. Similarities and differences between Y[sub 1[minus]x]Pr[sub x]Ba[sub 2]Cu[sub 4]O[sub 8] and Y[sub 1[minus]x]Pr[sub x]Ba[sub 2]Cu[sub 3]O[sub 7[minus]y] also were noted and are discussed in this paper.

• OSTI ID: 6220076
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:8; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
360207* -- Ceramics
Cermets
&amp; Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
COPPER COMPOUNDS
COPPER OXIDES
DATA
DECOMPOSITION
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EVALUATION
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
LATTICE PARAMETERS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
METALLURGICAL EFFECTS
METALS
NITRIC ACID
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
PRASEODYMIUM
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
PYROLYSIS
RARE EARTH COMPOUNDS
RARE EARTHS
SCATTERING
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES