Abstract

Effect of La-and/or Nb-doping on structure and elastic behavior of BaFeO3- at room temperature and 850 degrees C were studied and compared. The Comparison of the microstructures and grain size distributions of densified Ba0.95La0.05FeO3- (BLFO), BaFe0.9Nb0.1O3- (BFNO) and B0.95La0.05aFe0.9Nb0.1O3- (BLFNO) showed that Nb -doping hindered grain growth during sintering. The XRD analyses of sintered samples demonstrates that La-doping is more effective than Nb-doping for stabilization of high temperature symmetric cubic structure as it proved by BLFO's linear elastic behavior in cyclic compression stress-strain curves. BFNO and BLFNO exhibited ferroelastic behavior at room temperature due to presence of non-symmetric phases in their structures. All samples showed linear elastic behavior at 850 degrees C with remnant strain due to high temperature creep deformations. Both La-and Nb-doping can improve creep resistance of BaFeO3-3-5.