Abstract
Based on ambient ultrasonic measurements and x-ray diffraction under hydrostatic compression, the authors report here a comparative study of elasticity on oxygen-deficient perovskite, BaCe1−xYxO3−0.5x, with x=0.00 and 0.15. The results show that the presence of 2.5% oxygen vacancy has no measurable effect on the elastic bulk modulus. The shear modulus, however, decreases by approximately 5% in BaCe0.85Y0.15O2.925 perovskite. The differences between Y3+-doped cerate and Al3+-doped silicate suggest that the effect of oxygen vacancy on the elastic properties could be system dependent and may also be sensitive to distribution of oxygen vacancies within structures of the parent compounds.
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