Abstract

BaFeO3-delta (BFO) and BaFe0.9Zr0.1O3-delta (BFZO) oxides were synthesized by sol-gel method and their mechanical properties in room temperature and 850 degrees C were investigated and compared. The Rietveld refinement of the sintered samples at 1300 degrees C/10 h revealed that Zr-doping stabilized the symmetric cubic structure in BFZO from a multiphase (hexagonal and cubic) crystal structure in BFO. The room temperature non-linear stressstrain curves of BFO revealed its ferroelastic behavior due to the ferroelastic domain stitching under stress. In contrary, BFZO at room temperature and both BFO and BFZO at 850 degrees C exhibit linear elastic behavior as they have symmetric cubic crystal structure. The high temperature mechanical testings show that Zr-doping can also improve creep resistance of BFO.