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Microstructural characterization of GaSr2Ca2Cu3O9+δ, n = 3 member of the homologous series of superconductors GaSr2Can−1CunO2n+3

✍ Scribed by J. Ramirez-Castellanos; Y. Matsui; E. Takayama-Muromachi; M. Isobe

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
347 KB
Volume
251
Category
Article
ISSN
0921-4534

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✦ Synopsis

The microstructure of the n = 3 member of the homologous series of superconductors GaSr2Ca ._ 1Cu,O2, + 3 prepared under high pressure (6 GPa) was investigated by means of selected-area electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM). The GaSr2Ca2Cu309+ ~ phase has an orthorhombic structure with a double periodicity along the b-axis, due to the intralayer ordering between two different types of GaO 4 chains. Also, interlayer disordering of the chains along the c-axis was observed.

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Thermoelectric powers (TEPs) of the pristine (Bi,Pb) 2 Sr 2 Ca n؊1 Cu n O 2n؉4؉ (n‫2؍‬ and 3) compounds and their iodine intercalates were measured as a function of temperature, in order to investigate the effect of intercalation on the conduction mechanism of the host compounds. From the comparativ