Preparation and Characterization of Perovskite-like Mixed Oxides La_(2-x)Sr_xCuO_4 by Pechini Method

Pechini method was taken to synthesize perovskite-like mixed oxides La2-xSrxCuO4( x =0 ~0. 4); XRD,TG, SEM,BET and H2-TPR were used to characterize the samples obtained. The effects of the amount of citric acid,calcination temperature and the substitution amount of Sr on the phase formation,specific area and catalytic capability have been investigated. The experiment shows that when citric acid-to-metal nitrates molar ratio and calcination temperature reaches 4 and 800℃ respectively,the sample obtained is single phase with good particle distribution and satisfying crystallization. XRD shows that when x 0,all the samples obtained are single-phase perovskite-like mixed oxides. With the increase of x,the specific surface areas of the samples increase and the catalytic performance of samples at low temperature has been improved.