Effect of precursor powder uniformity on structure and electrical properties of gadolinium-doped cerium oxide ceramics

The effects of precursor powder uniformity on structure and electrical properties Gd-doped CeO2 (GDC) electrolytes were studied. as-synthesized GDCx powders (x = 5, 10 15 at.%) calcined at 600 1200?C combined in mass ratios 100:0 95:5 to obtain two with different particle size distributions. Sintering the pressed pellets was performed 1300 1400?C for h. Crystal structure, microstructure samples investigated by X-ray diffraction, scanning electron microscopy AC impedance spectroscopy, respectively. When a smaller proportion large particles (calcined 1200 ?C) present powders, sinterability prepared is slowed down, which had an adverse effect conductivity. lower concentration Gd, more significant effect. At higher sintering temperature (1400?C), influence Gd ionic conductivity obvious. GDC15 sample, from 600?C, highest ?asGB/?Bulk ratio 300?C.