Metodologia de obtenção de precursores cerâmicos a base de titânio

Abstract

This work is a synthesis route for a ceramic oxide precursor Cr3+ / Ti4+ using Ti(IV) isopropoxide and Cr(II) acetate dihydrate in tetrahydrofuran (THF) and triethylorthoformate solvents which generates titanates Cr2Tin-2O2n-1 through thermal treatment. Elemental analysis, IR, XRD and TG/DTG as well as the products from thermal treatment by XRD characterize the precursor. In the range 600-800 ºC (at air athmosphere) the thermal treatment conducts to aCr2O3 and Cr2Ti4O11. The a-Cr2O3 still appears in the XRD of the TG/DTG residues of the Cr2+ acetate dihydrate and the precursor (both under Ar). The XRD at 1000 ºC for 13 h contains TiO2 (rutile), Cr2Ti4O11 and Somiya phase (E). The Cr2Ti6O15 and a-Cr2O3 appear in the precursor’s XRD at 1200 ºC for 13 h (at air athmosphere).