Oxygen stoichiometry and structural parameters of Sm1+xBa2-xCu3Oy solid solutions versus composition and temperature

被引：8
作者：
Drozd, VA
Baginski, IL
Nedilko, SA
Mel'nikov, VS
机构：
[1] Kiev Taras Shevchenko Univ, Dept Chem, UA-01033 Kiev, Ukraine
[2] Inst Geochem Mineral & Ore Format, UA-03142 Kiev, Ukraine
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2004年 / 384卷 / 1-2期
关键词：
high-T(c) superconductors; sol-gel synthesis; X-ray diffraction; electronic transport;
D O I：
10.1016/j.jallcom.2004.03.125
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effects of temperature and samarium content on oxygen stoichiometry and crystal lattice parameters of the Sm(1+x)Ba(2-x)Cu(3)O(y) solid solutions (Sm123ss) prepared by the citrate sol-gel method were studied. It was found that there are three compositional ranges of variation of the structural-chemical characteristics of the Sm123ss corresponding to the regions of existence of the following three phases: orthorhombic phase I (0 < x < 0.15-0.20), tetragonal phase (0.20 < x < 0.60) and orthorhombic phase II (x > 0.65). The above phases behave differently with temperature: (a) the orthorhombic phase I behaves with temperature like the Y123 phase; (b) the lattice parameters a and c of the tetragonal phase vary, i.e., its lattice is relatively rigid as oxygen is removed; (c) the orthorhombic phase 11 has a very rigid crystal lattice. (C) 2004 Elsevier B.V. All rights reserved.
引用
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页码：44 / 50
页数：7
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