Synthetic studies of ABB′O3 (A=La, Pr, Nd; B=Fe, Mn; B′=Pd, Pt) perovskites

Perovskites LaB1−xBx′O3, PrB1−xBx′O3 and NdB1−xBx′O3, where B is Fe or Mn and B′ is Pd or Pt, were synthesized by sol-gel method. Structures were characterized by powder XRD and surface areas, oxygen desorption and reduction properties were determined. The surface areas of prepared perovskites were between 10 and 29 m2 g−1. The oxygen desorption and reduction studies showed behavior of the perovskites to be similar for different combinations of the A and B cations. The structures of the perovskites were characterized again after desorption (O2-TPD) and reduction (H2-TPR) analyses and after a heat treatment test. The XRD diffraction patterns showed that cubic structures of the perovskites were stable at elevated temperatures and under applied atmospheres.