SYNTHESIS OF NANOSTRUCTURED LANTHANUM OXIDE POWDERS IN AMMONIUM CARBONATE SOLUTION BY PRECIPITATION METHOD

The features of formation of nanostructured lanthanum oxide powders by precipitation at low temperature (10°C) were studied. The sources for synthesis were lanthanum nitrate salt, the precipitant was ammonium carbonate solution together with hydrogen peroxide, and propylene glycol was used as a dispersing agent. Studies of morphological and structural characteristics of powders using scanning electron microscopy and X-ray phase analysis showed that particles are largely agglomerated, the size of the coherent scattering region (nominal diameter D) of powder particles calcined at 600, 900 and 1200°C is 19, 22 and 24 nm, respectively.