Combustion synthesis of La Cr O3 powders

The combustion reaction of liquid solutions has been used to prepare La Cr O3 powders. The technique is compared with an alternative chemical route for powder preparation and with the conventional mixture of oxides. Powders were characterized by X-ray diffraction, particle size distribution and scanning and transmission electron microscopy. The fine and also uniform particle size distribution (<1μm) in the powder prepared in the case of he combustion reaction ensures their sinterability. The exothermic reaction produces a sufficiently high temperature for crystallization of the structure to occur avoiding the necessity for further calcination. The large quantities of gas evolved inhibited particle agglomeration and yielded soft powders suitable for dispersion and use. (author)