Redox mechanisms and density of holes by XAS in the compensated series Bi[sub 2[minus]x]Pb[sub x]Sr[sub 2]Ca[sub 1[minus]x]Y[sub x]Cu[sub 2]O[sub 8+[delta]] ( 0 [le] x [le] 1)

Bi[sub 2[minus]x]Pb[sub x]Sr[sub 2]Ca[sub 1[minus]x]Y[sub x]Cu[sub 2]O[sub 8+[delta]] (0 [le] x [le] 1) of structural type Bi(2212) is a very interesting solid solution since one is able to adjust the critical temperature over a large range of x by means of a mere formal exchange of charge between c...

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Bibliographic Details
Published in:Journal of solid state chemistry 1993-07, Vol.105:1
Main Authors: Merrien, N., Studer, F., Poullain, G., Michel, C., Flank, A.M., Lagarde, P., Fontaine, A.
Format: Article
Language:English
Subjects:
360207 - Ceramics, Cermets, & Refractories- Superconducting Properties- (1992-)
ABSORPTION SPECTROSCOPY
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL TEMPERATURE
HOLES
IONS
LEAD COMPOUNDS
LEAD OXIDES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MATERIALS SCIENCE
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REDUCTION
SPECTROSCOPY
STOICHIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VALENCE
X-RAY SPECTROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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Summary:Bi[sub 2[minus]x]Pb[sub x]Sr[sub 2]Ca[sub 1[minus]x]Y[sub x]Cu[sub 2]O[sub 8+[delta]] (0 [le] x [le] 1) of structural type Bi(2212) is a very interesting solid solution since one is able to adjust the critical temperature over a large range of x by means of a mere formal exchange of charge between cations which do not belong to the essential [CuO[sub 2]][sub [infinity]] planes. X-ray absorption spectroscopy was performed at bismuth, lead, and copper L[sub 3]-edges on the Bi[sub 2[minus]x]Pb[sub x]Sr[sub 2]Ca[sub 1[minus]x]Y[sub x]Cu[sub 2]O[sub 8+[delta]] (0 [le] x [le] 1) solid solution in order to investigate the formal valence states of the elements and the correlation between hole density on the [CuO[sub 2]][sub [infinity]] planes and superconducting properties. It is shown that lead substitution does affect the role of the [BiO][sub [infinity]] planes which exchange electrons (holes) with the [CuO[sub 2]][sub [infinity]] planes. The decrease of the hole density in the [CuO[sub 2]][sub [infinity]] planes with increasing x has been correlated to the decrease of [Tc]'s, whereas the rapid decrease of the diamagnetic volume for 0.3 [le] x [le] 0.7 has been understood on the basis of a segregation between bismuth- and lead-rich phases. 37 refs., 11 figs., 1 tab.
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.1993.1199