Electron diffraction studies of the incommensurate modulations in (Bi-Pb)-Sr-Ca-Cu-O superconductors
Résumé
We have studied the incommensurate modulations of lead free Bi-Sr-Ca-Cu-O and lead substituted (Bi-Pb)-Sr-Ca-Cu-O superconductors at different temperatures between 110 K and 300 K. The modulations are temperature independent in this interval. The incommensurate modulations of two lead substituted compounds of nominal compositions Bi1.8Pb0.2Sr2Ca2Cu3Ox and Bi1.5Pb0.5Sr 2Ca2Cu3Oy have been observed at room temperature. The Pb modulation value decreases with a higher lead concentration.
Mots clés
Bi sub 1.8 Pb sub 0.2 Sr sub 2 Ca sub 2 Cu sub 3 O sub x
Bi sub 1.5 Pb sub 0.5 Sr sub 2 Ca sub 2 Cu sub 3 O sub y
bismuth compounds
calcium compounds
crystal atomic structure of inorganic compounds
electron diffraction examination of materials
high temperature superconductors
lead compounds
strontium compounds
electron diffraction
incommensurate modulations
110 to 300 K
Domaines
Articles anciens
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