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Crystal structures of Pb2Sr2Y1−xCaxCu3O8+δ (x= 0, 0.5)

✍ Scribed by W.G. Haije; K. Kadowaki; M.J.V. Menken; A.C. Moleman; A.A. Menovsky; J.J.M. Franse; E. Frikkee

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
111 KB
Volume
162-164
Category
Article
ISSN
0921-4534

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✦ Synopsis

Powder neutron diffraction measurements were performed on the compounds Pb^Sr~Y. Ca Cu.0A+ ~ ~ A-X X (x O, 0.5) to determine the structural parameters, especially the coordi~ates and occupation of the oxygen sites. A comparison is made between the structures of the superconducting (x = 0.5) and non-superconducting (x = O) compound.

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Crystal structure, atomic ordering and charge localization in Pb2Sr2Y1−xCaxCu3O8+δ (x=0, δ=1.47)
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Neutron, X-ray and electron diffraction measurements have been carried out on Pb2Sr2Yl \_xCaxCu3Os+6 samples. The oxygen incorporated in the structure during the oxidation is located on the (Cu) planes sandwiched between the two (PbO) layers. A theoretical composition of 8 = 2 is possible, although

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We have prepared several samples of Pb2Sr2Yl-xCaxCu308+O with various well defined oxygen contents and studied their oxidation process by TGA and characterized them by X-ray and electron diffraction. For x = 0 the upper limit for ~ is found to be 1.9. We show that the oxidation process is accompanie