Conductivity study of dense BaCe_xZr_{(0.9鈭?span style='font-style: italic'>x)}Y_0.1O_{(3鈭?span style='font-style: italic'>未)} prepared by solid state reactive sintering at 1500聽掳C

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• 作者：S. Ricote^a ; ^{sari@risoe.dtu.dk} ; N. Bonanos^a ; A. Manerbino^b ; ^c ; W.G. Coors^b
• 关键词：Barium cerate ; Barium zirconate ; High temperature proton conductor ; Solid state reactive sintering ; Impedance spectroscopy
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：May, 2012
• 卷：37
• 期：9
• 页码：7954-7961
• 文件大小：1284 K

摘要

A cost and time effective process was used to prepare the solid solutions BaCe_xZr_{(0.9鈭?em>x)}Y_0.1O_{(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.