Synthesis, structural and physico-chemical characterization of new defect pyrochlore-type antimonates K_(0.42)Ln_y'Sb_2O_(6+z') and Na_(0.36)Ln_ySb_2O_(6+z) (0 < y, y', z, z'<1; Ln = Y, Eu and Gd) prepared by soft chemistry route

摘要

Most of the pyrochlore-type compounds known and reported in the literature were prepared by solid state reactions, at elevated temperature (approx 1100 deg C). Alternatively, a new series of compounds, with formula K_(0.42)Ln_y'Sb_2O_(6+z') and Na_(0.36)Ln_ySb_2O_(6+z) (0 < y, y' (with 0