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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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