| abstract |
At least suitable for the preparation of perovskite type materials corresponding to general formula (I): A (1-X) A ′ x B (1- yU ) B ′ y B ″ u ３− 3-δ, (I) A method for preparing a sol-gel from salts of four metals M 1 , M 2 , M 3 and M 4 , said method comprising the stoichiometry necessary to obtain the material as defined above a) Preparing an aqueous solution of a water-soluble salt of said elements A, A ′ optionally A ″, B and B ′ in a ratio; b) preparing an aqueous alcohol solution containing at least one nonionic surfactant in the alcohol The concentration of the nonionic surfactant in the aqueous alcohol solution at a ratio sufficient to ensure complete dissolution of the nonionic surfactant in the aqueous alcohol solution. Prepared in step a) where c is less than the critical micelle concentration, c) step a) A step of mixing the aqueous solution with the alcohol dispersion prepared in step b) to form a sol, d) a step of evaporating the solvent to dry the sol obtained in step c) to obtain a sol-gel Including. [Selection figure] None |