Simultaneous dysprosium- and lead-substituted high- T sub c superconductor bismuth cuprates

Journal Article · Sat Dec 15 04:00:00 EST 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.346880· OSTI ID:6116097

Schieber, M ^[1]; Friedman, M ^[2]; Levinsky, M ^[3]; Zhou, B L ^[4]; Gasga, J R; Van Tendeloo, G; Amelinckx, S ^[5]

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1. Xsirius Superconductivity Materials, 7590 East Gray Road, Scottsdale, Arizona 85460 (USA) School of Applied Science, Hebrew University of Jerusalem, Jerusalem, (Israel)
2. Xsirius Superconductivity Materials, Israel, Har Hahotsvim, P. O. Box 23566, Jerusalem 91230, (Israel) School of Applied Science, Hebrew University of Jerusalem, Jerusalem, (Israel)
3. Xsirius Superconductivity Materials, Israel, Har Hahotsvim, P. O. Box 23566, Jerusalem 91230, (Israel)
4. Xsirius Superconductivity Materials, 7590 East Gray Road, Scottsdale, Arizona 85460 (USA)
5. University of Antwerp (RUCA), Groenenborgerlaan 171, B-2020 Antwerp, (Belgium)

The introduction of small amounts of Dy in ceramic BiSrCaCuO (BSCCO) with nominal composition of Bi{sub 2}Sr{sub 2}Ca{sub 1{minus}{ital x}}Dy{sub {ital x}}Cu{sub 2}O{sub 8+{ital z}}, Bi{sub 2}Sr{sub 2}Ca{sub 2{minus}{ital x}}Dy{sub {ital x}}Cu{sub 3}O{sub 10+{ital z}}, and Bi{sub 1.6}Pb{sub 0.4}Sr{sub 2}Ca{sub 2{minus}{ital x}}Dy{sub {ital x}}Cu{sub 3}O{sub 10+{ital z}} with 0.1{lt}{ital x}{lt}0.3 was studied in both stoichiometric and nonstoichiometric compositions where the nonstoichiometric composition was used to aid the sintering process in order to obtain a maximum {ital T}{sub {ital c}} and contained excesses of CaO and CuO. It was found that regardless of the sintering conditions and starting compositions only the Bi:Sr:Ca:Cu=2:2:1:2 (2212) phase was produced. The highest {ital T}{sub {ital c}} ({ital R}=0) in the Dy-substituted sample obtained was 84 K and this was obtained only for the nonstoichiometric composition Bi{sub 1.6}Pb{sub 0.4}Sr{sub 2}Ca{sub 2.5}Dy{sub 0.3}Cu{sub 3.5}O{sub {ital x}} which contained mostly the 2212 phase together with tiny amounts of Bi{sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} (2223) phase. High-resolution electron microscopy data performed on Bi{sub 1.6}Pb{sub 0.4}Sr{sub 2}Ca{sub 2.5}Dy{sub 0.3}Cu{sub 3.5}0{sub 10+{ital z}} show that the introduction of Dy in the original 2223 Pb-containing phase caused only the formation of the 2212 phase without changing the modulated structure known to occur in the substituted Bi and Sr BSCCO compounds confirming also earlier suggestions made by Tarrascon {ital et} {ital al}. (Phys. Rev. B {bold 2}, 4316 (1989)) that the rare-earth cations stabilize the 2212 phase and substitute only for Ca and not for the Sr or Bi sites in the 2212 phase.

• OSTI ID: 6116097
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 68:12; ISSN 0021-8979; ISSN JAPIA
• 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
COPPER COMPOUNDS
COPPER OXIDES
DYSPROSIUM ADDITIONS
DYSPROSIUM ALLOYS
ELECTRON MICROSCOPY
HIGH-TC SUPERCONDUCTORS
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE