Caracterização de cerâmicas complexas dos sistemas Sm3NbO7, Sm2Sn2O7 e SmXO3 (X = Cr, Co, Fe, Mn) sintetizadas por moagem mecânica de alta energia

Abstract

Ex situ x-ray diffraction (XRD) and Rietveld method investigated the kinetics of complex ceramics formation by combining samarium oxide (Sm2O3) with high purity metals (X = Sn, Mn, Fe, Cr, Co, Nb, Ta) subjected to high energy mechanical alloying. Perovskites were obtained for X = Mn, Fe, Cr, Co, pyrochlorite Sm2Sn2O7 for X = Sn and for X = Nb a defect fluorite-type structure (Sm3NbO7) synthesized for the first time through mechanical alloying, without thermal treatment. The thermal stability of the defect fluorite was investigated by differential scanning calorimetry combined with heat treatment, XRD and Raman spectroscopy.