Process for producing nanoparticles and their use in the production of high-temperature superconductors

摘要

Known processes for the production of nanoparticles of compounds of the transition metals Zr, Ti, Ta, rare earths (RE), Mn, and Fe via microemulsions lead to products that contain impurities from the reactants, particularly water, which make the further use of said nanoparticles difficult, for instance in high-temperature super conductors (HTSC). It is proposed that the nanoparticles be produced via anhydrous microemulsions having an outer phase composed of a nonpolar solvent and inner phase composed of a polar anhydrous solvent. The nanoparticles thus obtained exhibit good monodispersity and can be used in the production of REBa2Cu3O7 super conductors by incorporation into the precursor coating solution.

主权项

1. A process for producing nanoparticles comprising a compound comprising a metal, the process comprising:
preparing a w/o microemulsion with at least one precursor of the metal in a dispersed polar phase with an aid of a surfactant, and adding a precipitant to a continuous nonpolar phase, wherein the metal is a transition metal Zr, Hf, Ti, Ta, Sc, Y or La, an element with an atomic number 58 (Ce) to 71 (Lu), Mn, or Fe, a solvent for the at least one precursor in the dispersed polar phase is a polar solvent having a water content of <1 mol-% and the precipitant in the continuous nonpolar phase is a base.