Abstract
The aim of this paper is to study the influence of non-isovalent “doping” in YBa2Cu3O7−y in particular on its synthesis conditions and on the resistive properties both with and without a magnetic field. We concentrate on the study of possible alkali ions (Na, K, Cs) “substitution” at the barium sites. A low temperature sintering process is used in order to induce a reactive liquid phase. The final chemical composition is discussed as a function of the amount of the liquid phase. No alkali ion is substituted. Carbonate layers are present. However, this (lack of) “substitution” leads to induced vacancies and improved electrical transport properties which are as good as in highly pure materials. For conciseness the case of Na “substitution” only is illustrated. The use of such data in order to probe the microstructure is emphasized.
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