Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/3222
Title: Enhancement of T-c by substituting strontium for barium in the YBa2Cu4O8 superconductor prepared by a sol-gel method
Authors: VAN BAEL, Marlies 
KAREIVA, Aivaras
VANHOYLAND, Geert 
D'HAEN, Jan 
D'OLIESLAEGER, Marc 
FRANCO, Dirk 
QUAEYHAEGENS, Carl 
YPERMAN, Jan 
MULLENS, Jules 
VAN POUCKE, Lucien 
Issue Date: 1998
Publisher: ELSEVIER SCIENCE BV
Source: PHYSICA C, 307(3-4). p. 209-220
Abstract: In order to study the influence of strontium substitution on YBa2Cu4O8, two series of samples with composition Y:Sr:Ba:Cu = 1 - x:x:2:4 and Y:Ba:Sr:Cu = 1:2 - 2x:2x:4 (x = 0.0-1.0) were synthesized by a simple aqueous sol-gel method at 1 atmosphere oxygen pressure. Effects of strontium substitutions on the properties of the compounds were studied by thermogravimetric analysis, X-ray powder diffraction, scanning electron microscopy and resistivity measurements. It was unambiguously demonstrated that in both series strontium enters the structure at the barium positions. Nearly single-phase Y(Ba1-xSrx)(2)Cu4O8 superconducting samples for x = 0.0-0.3 were obtained, when final heat treatment was carried out at 835 degrees C for 70 h in flowing oxygen atmosphere. The critical temperature of the Y(Ba1-xSrx)(2)Cu4O8 is enhanced to 88 K at about 20% Sr substitution. (C) 1998 Published by Elsevier Science B.V. All rights reserved.
Notes: Limburgs Univ Ctr, IMO, Lab Inorgan & Phys Chem, B-3590 Diepenbeek, Belgium. Vilnius State Univ, Dept Gen & Inorgan Chem, LT-2006 Vilnius, Lithuania. Limburgs Univ Ctr, IMO, Dept Phys Mat, B-3590 Diepenbeek, Belgium.Van Bael, MK, Limburgs Univ Ctr, IMO, Lab Inorgan & Phys Chem, B-3590 Diepenbeek, Belgium.
Keywords: synthesis of Y(Ba1-xSrx)(2)Cu4Oy; substitution effects; electrical resistivity
Document URI: http://hdl.handle.net/1942/3222
DOI: 10.1016/S0921-4534(98)00520-6
ISI #: 000076968500006
Type: Journal Contribution
Validations: ecoom 1999
Appears in Collections:Research publications

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