Published 1990
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Electronic structure of bismuth in high-temperature superconductor Bi1.6Pb0.4Sr2Ca2.5Cu3.5Oσ
Description
The shifts of Kα1 X-ray of bismuth in the HTS-ceramic Bi1.6Pb0.4Sr2Ca2.5Cu5Oσ and Bi2O3 are measured experimentally. It is shown that bismuth is threevalent in the HTS-ceramic. From comparison of the experimental values of shifts with theoretical values calculated within the framework of different modifications of Hartree-Fock method the effective charge at the bismuth atoms in these compounds is determined: q(Bi2O3)=1.5+2.0, q(Bi1.6Pb0.4Sr2Ca2.5Cu3.5Oσ)= 1.6+2.1. It was suggested, That the Bi significant covalence degree in HTS-ceramic may be a cause of noticeable contribution of the Bi 6p-states in the density of states at Fermi-level. 13 refs.; 1 fig.; 2 tabs
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Additional details
Additional titles
- Original title (Russian)
- Электронная структура висмута в высокотемпературном сверхпроводнике Би
Publishing Information
- Imprint Pagination
- 8 p.
- Report number
- LIYaF--1623
INIS
- Country of Publication
- USSR
- Country of Input or Organization
- USSR
- INIS RN
- 22057196
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- BISMUTH COMPOUNDS; BISMUTH IONS; CALCIUM COMPOUNDS; CERAMICS; CUPRATES; EFFECTIVE CHARGE; ENERGY-LEVEL DENSITY; FERMI LEVEL; HARTREE-FOCK METHOD; K SHELL; LEAD COMPOUNDS; POLYCRYSTALS; SPECTRAL SHIFT; STRONTIUM COMPOUNDS; X-RAY DIFFRACTION
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; ATOMIC IONS; CHARGED PARTICLES; COHERENT SCATTERING; COPPER COMPOUNDS; CRYSTALS; DIFFRACTION; ELECTRONIC STRUCTURE; ENERGY LEVELS; IONS; OXYGEN COMPOUNDS; SCATTERING; TRANSITION ELEMENT COMPOUNDS