采用固相反应法合成了具有四方钙钛矿结构的混合氧离子导体SmAl1-xZnxO3-δ(x=0,0.03,0.05,0.1).通过直流四引线法对样品的电导率与温度和氧分压的关系进行了测量.结果表明,Zn2+掺杂显著提高了样品的电导率,与未掺杂的SmAlO3相比,其电导率提高了3～4个数量级.在所有样品中,SmAl0.95Zn0.05O3-δ的电导率最高,800℃时为3.5×10-1S/m,活化能为0.43eV.在973～1273K范围内,SmAl0.95Zn0 05O3-δ是一个氧离子和电子空穴的混合导体,但氧离子迁移数(ti)大于0.8,以离子导电为主.随着温度的下降,样品的氧离子迁移数逐渐增加.
参考文献
| [1] | Seungdoo P;John M V;Raymond J G .Direct oxidation of hydrocarbons in a solid-oxide fuel cell[J].Nature,2000,404:265. |
| [2] | Minh N Q .Ceramic fuel cells[J].Journal of the American Ceramic Society,1993,76(03):563. |
| [3] | Fray DJ. .THE USE OF SOLID ELECTROLYTES AS SENSORS FOR APPLICATIONS IN MOLTEN METALS[J].Solid state ionics,1996(2):1045-1054. |
| [4] | Badwal SPS.;Ciacchi FT. .Ceramic membrane technologies for oxygen separation[J].Advanced Materials,2001(12/13):993-996. |
| [5] | Cook R L;Macduff R C .Perovskite solid electrolytes for intermediate temperature solid oxide fuel cells[J].Journal of the Electrochemical Society,1990,137(10):3309. |
| [6] | Ishihara T;Matduda H;Takita Y .Doped LaGaO3 perovskite type oxide as a new oide ionic conductor[J].Journal of the American Chemical Society,1994,116:3801. |
| [7] | Petric A;Huang P .Oxygen conductivity of Nd(Sr/Ca)Ga(Mg)O3 perovskites[J].Solid State Ionics,1996,92:113. |
| [8] | Ishihara T;Furutani H;Arikawa H et al.Oxide ion conductivity in doubly doped prGaO3 perovskite-type oxid[J].Journal of the Electrochemical Society,1999,146(05):1643. |
| [9] | Ishihara T;Matsuda H;Mizuhara Y et al.Improved oxygen ion conductivity of NdAlO3 perovskite-type oxide by doping with Ga[J].Solid State Ionics,1994,70-71:234. |
| [10] | Nomura K.;Tanase S. .ELECTRICAL CONDUCTION BEHAVIOR IN (LA0.9SR0.1)MIIIO3-DELTA (M-III=AL, GA, SC, IN, AND LU) PEROVSKITES[J].Solid state ionics,1997(3/4):229-236. |
| [11] | Hayashi H.;Matsuyama M.;Lan N.G.;Dokiya M.;Tagawa H.;Inaba H. .Structural consideration on the ionic conductivity of perovskite-type oxides[J].Solid state ionics,1999(1/4):1-15. |
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