Abstract
Materials of the composition (Tl,Pb)Sr2Ca2Cu3O9- delta have been synthesized with different O stoichiometries and their structure and superconducting properties investigated. Powder neutron-diffraction studies reveal that the Tl and O atoms in the Ti-O layers are both disordered off the ideal sites and are partially vacant, producing a highly distorted environment. As a result of changing the Tl and O stoichiometry the apical Cu-O bond and cuprate layer spacing decrease with decreasing site occupancy. These structural changes are discussed in relation to the superconducting properties and comparisons drawn to the (Tl,Pb)Sr2CaCu2O7- delta phase and the double-Tl-layer materials.
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