| Abstract [eng] |
The aim of this work is to study materials based on BaCe0,9Y0,1O3−\delta (BCY) ceramic with partial substitutions of Mo, Cu and Li by impedance spectroscopy methods. In this work BaCe0,8-xCu0,075-xMo0,025Y0,1O3-\delta (x=0, 0.25, 0.75, sintered at 1473K and 1573K temperatures) and Ba1-xLixCe0,8Cu0,1Y0,1O3-\delta (x=0.025 sintered at 1573K temperature and x=0.075 sintered at 1473K and 1573K temperatures) materials were analyzed using impedance spectra. Measurements of these materials were done in frequency range from 1Hz to 10GHz. For every sample multiple impedance spectra were made in different temperatures (300K-1000K). After analysis of impedance spectra, activation energy was calculated. Calculated activation energies for BaCe0,8-xCu0,075-xMo0,025Y0,1O3-\delta sintered in 1473K temperature are x=0 273-323K: 0,14eV and 373-923K: 0,42eV for bulk and 273-323K: 0,12 and 473-923K: 0,56 for grain boundary, x=0,025 323-923K: 0,52eV for bulk and 303-373K: 0,25 and 573-923K: 0,52 for grain boundary, x=0,05 273-323K: 0,012eV and 373-923K: 0,58eV for bulk and 273-373K: 0,1 and 373-923K: 0,75 for grain boundary. Calculated activation energies for BaCe0,8-xCu0,075-xMo0,025Y0,1O3-\delta sintered in 1573K temperature are x=0 380-460K: 0,54eV and 580-1000K: 0,56eV for bulk and 380-420K: 0,31eV and 480-1000K: 0,84eV for grain boundary, x=0,025 380-1000K: 0,74eV for bulk and 480-640K: 1,17eV and 850-1000K: 1,16eV for grain boundary, x=0,05 360-1000K: 0,61eV for bulk and 360-440K: 0,48eV and 640-1000K: 0,61eV for grain boundary. Calculated activation energies for Ba1-xLixCe0,8Cu0,1Y0,1O3-\delta are x=0,025 0,38ev, x=0,075 0,43eV for both sintering temperatures. |
