SYNTHESIS OF ND-DOPED BARIUM CERATE PROTON CONDUCTOR FROM OXALATE COPRECIPITATE PRECURSOR

The decomposition process of barium, cerium and neodymium oxalates in air was investigated by DTA-TG. Decomposition of an oxalate coprecipit ate precursor and formation of barium cerate were examined in air, N-2 and CO2 atmospheres, respectively, by employing DTA-TG and XRD. The r esults showed that, in air, cerium oxalate could easily be decomposed to CeO2 below 350 degrees C and Nd2O3 could be obtained at 670 degrees C, while a high temperature of > 1400 degrees C was needed to obtain BaO. Although some amount of BaCeO3 was formed at 500 degrees C in air , at 650 degrees C in N-2 and at 800 degrees C in CO2, single perovski te phase of BaCeO3 could only be obtained at a much higher temperature .