TIO2 POWDERS WERE OBTAINED BY CALCINATION OF BASE HYDROLYSIS PRODUCTS OF TITANIUM(IV) ISOPROPOXIDE, TI(OPRI)4 AT 400°C FOR 3 H. THE HYDROLYSIS WAS CARRIED OUT AT ROOM TEMPERATURE IN TWO DIFFERENT SOLVENTS, NAMELY ISOPROPANOL AND N-HEPTANE, AND IN THE PRESENCE OF LOW AND HIGH AMMONIA CONTENTS. X-RAY POWDER DIFFRACTOMETRY SHOWED THE RESULTING TIO2 POWDERS TO CONSIST OF ANATASE CRYSTALLITES, IRRESPECTIVE OF ... إقراء المزيد