Effect of Complexants on Nano-La₂O₃ Prepared by Solid State Chemical Reaction

【Abstract】 Precursors were prepared by solid state chemical reaction between LaCl₃ and C₂H₂O₄·2H₂O or NH₄HCO₃ at ambient temperature. Differential temperature analysis （DTA） and thermogravimetric analysis （TGA） were used to determine the decomposing temperature. Oxide （La₂O₃） was obtained by decomposing the precursor for about 2.5 h. X-ray diffraction （XRD）, scanning electronic microscope （SEM） and ZETA potentiometer were respectively used to analyze the composition, morphology and size distribution of the products. The results show that La₂O₃ prepared by LaCl₃ and C₂H₂O₄·2H₂O is of ball-like shape and the diameter of particles （95%） is below 50 nm, while La₂O₃ prepared by LaCl₃ and NH₄HCO₃ is net-like.更多还原