Patents
A process for making calcium substituted lanthanum chromite useful for application in solid oxide fuel cells by mixing lanthanum nitrate, chromium nitrate calcium nitrate, glycine & citric acid having metal ion ratio of La:Ca:Cr = 0.70:0.30:1.0 and a fixed glycine/nitrate ratio ranging between 0.50 to 0.7 and a fixed citric acid/nitrate ratio ranging between 0.05 to 0.15 evaporating the above mixture solution on a hot plate under continuous stirring, continuing the evaporation till the volume of the solution is reduced to 80-90% of the original volume, atomizing the above said solution with spray nozzles with sizes in the range of 0.5mm to 1mm at a flow rate in the range of 20-25ml/minute at air pressure in the range of 20-25psi to obtain the spray pyrolysed powder, calcining the above said powder at 650-1150oC for 6 hours milling the above said calcined powder with solvent for 3-8hours compacting the said powder at a pressure of 135-490MPa to obtain calcium substituted lanthanum chromite.