Non-isovalent Metal Substitution for Bismuth, Strontium, Calcium, and Copper in Bi-based 2212 Superconducting Ceramics

摘要

The aim of this paper is to investigate the influence of non-isovalent alkali (Li, Na, K, andCs) substitution in Bi3Sr2CaCu,Ol<, in particular on its synthesis conditions and on their resistive and thermopower electrical properties. Liquid phase development during the synthesis process leads to the formation of sintered materials at a lower temperature compared to the undoped 2212. compound. The final composition is discussed: as a {/unction of which aystaUographic site is partially substituted. The .presence of alkah ions in the initial chemical composition leads to improved electrical properties. Such [data are correlated with the microstructure and chemical composition of the end-product.