OXYGEN STOICHIOMETRY AND THE STRUCTURE OF TL2BA2CA2CU3O10-Y - A HIGH-RESOLUTION POWDER NEUTRON-DIFFRACTION STUDY

被引：29
|
作者：
OGBORNE, DM [1 ]
WELLER, MT [1 ]
LANCHESTER, PC [1 ]
机构：
[1] UNIV SOUTHAMPTON,DEPT PHYS,SOUTHAMPTON SO9 5NH,HANTS,ENGLAND
来源：
PHYSICA C | 1992年 / 200卷 / 1-2期
关键词：
D O I：
10.1016/0921-4534(92)90333-8
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Samples of Tl2Ba2Ca2Cu3O10-y have been prepared with three different oxygen stoichiometries by reaction under various oxygen gas partial pressures. Powder neutron diffraction studies on these materials show that for y > 0 oxygen vacancies exist in the thallium-oxygen layer; filling this site results in a contraction of the lattice with concomitant reduction in the apical Cu-O bond length but with an expansion of the copper-oxygen interlayer distance. These structural changes which occur as a function of oxygen content are discussed in terms of the superconducting properties of these materials.
引用
收藏
页码：167 / 174
页数：8
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