摘要
A cost and time effective process was used to prepare the solid solutions BaCexZr(0.9鈭?em>x)Y0.1O(3鈭?em>未) (0聽鈮ぢ?em>x聽鈮ぢ?.4). 98%dense samples were obtained by solid state reactive sintering at 1500聽掳C for 4聽h, with the addition of 1聽wt%of NiO to the quantity of synthesized/sintered compound. Scanning electron micrographs reveal polygonal grains of 1-5 microns, whose size increases from the compound with no cerium (BCZY09) to the samples containing cerium (BCZY18-BCZY45). The conductivity, measured in wet reducing atmosphere (9%H2 in N2, p(H2O)聽=聽0.015聽atm) by impedance spectroscopy, increases with the cerium content. Some samples have also been prepared using barium sulfate (BaSO4) as barium precursor (instead of barium carbonate BaCO3) due to its non toxicity. The corresponding samples (prepared at 1575聽掳C) showed similar properties as the ones prepared with barium carbonate. Furthermore, different geometries (rods, tubes, pellets) could be made.