Densification and Electrical Conductivity of Mn-doped CeO_2

摘要

The influence of Mn addition (from 1 up to 10 mol%) on densification and electrical conductivity of CeO_2 was studied in detail. Bulk specimens were prepared by the conventional technique of mixing suitable amounts of cerium dioxide and manganese carbonate, followed by pressing and sintering. The apparent density of sintered specimens was determined by the immersion method and electrical characterization was carried out by impedance spectroscopy measurements in the 300 to 550 ℃ range. High densification (> 95% of the theoretical density) was obtained for small addition of Mn (1 mol%) to CeO_2 sintered at 1300 ℃ for only 0.1 h. Electrical conductivity changes in sintered pellets depend on the sintering procedure, but not on the manganese content.