A high-resolution neutron diffraction study on Tl2Ba2CaCu2O8−y: y=0, 0.05, 0.06

✍ Scribed by D.M. Ogborne; M.T. Weller; P.C. Lanchester

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 536 KB
• Volume: 200
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(92)90339-e

✦ Synopsis

Samples of T12Ba2CaCu208_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 c-parameter with concomitant reduction in the apical Cu-O bond length but with an expansion of the copper-oxygen inter-layer distance. These structural changes which occur as a function of oxygen content are discussed in terms of the superconducting properties of these materials and compared with those of the T12Ba2Ca2Cu30 l o -j, system.