Structure Electrical Conducting and Thermal Expansion Properties of Ln0.6Sr0.4Co0.8Fe0.2O3 (Ln=La,Pr,Nd,Sm)Ceramics

武汉理工大学学报-材料科学版(英文版), 2008, 23(3): 386-390.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

2.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

3.Department of Hydrogen and Fuel Cells Engineering, Hydrogen & Fuel Cell Research Center, Chonbuk National University, Chonju 561-756, Republic of Korea

4.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

5.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

6.Department of Hydrogen and Fuel Cells Engineering, Hydrogen & Fuel Cell Research Center, Chonbuk National University, Chonju 561-756, Republic of Korea

基金项目: Hubei Province Key Laboratory of Refractories and Ceramics-Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory(G0704) 国家自然科学基金(50572079) The International Collaboration Program of Jeonbuk Province(G0704) Program for New Century Excellent Talents in University of MOE(NCET-04-0724)

Structure Electrical Conducting and Thermal Expansion Properties of Ln0.6Sr0.4Co0.8Fe0.2O3 (Ln=La,Pr,Nd,Sm)Ceramics

XU Qing ^1, , HUANG Duanping ^2, , CHEN Min ^3, , CHEN Wen ^4, , LIU Hanxing ^5, , KIM Bokhee ^6,

1.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

2.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

3.Department of Hydrogen and Fuel Cells Engineering, Hydrogen & Fuel Cell Research Center, Chonbuk National University, Chonju 561-756, Republic of Korea

4.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

5.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

6.Department of Hydrogen and Fuel Cells Engineering, Hydrogen & Fuel Cell Research Center, Chonbuk National University, Chonju 561-756, Republic of Korea

Keywords： electrical conduction

Ln0.6Sr0.4Co0.8Fe0.2O3 (Ln=La, Pr, Nd, Sm) perovskite-type complex oxides were synthesized using a glycine-nitrate process, and the structure, electrical conducting and thermal expansion properties of the resulting ceramics were examined with regard to the nature of the lanthanide cations. The results indicated that the La, Pr and Nd specimens had a rhombohedral symmetry, while an orthorhombic structure was determined for the Sm specimen. The pseudo-cubic lattice constant decreased with smaller lanthanide cations. It was found that the electrical conducting properties declined with decreasing lanthanide cation size. Fortunately, all the compositions remained rather high electrical conductivities exceeding 650Ω1.cm-1 in the intermediate temperature range (600-800℃). An appreciable thermal expansion increase at high temperatures was detected for all the compositions. Decreasing the size of the lanthanide cations resulted in an increase of thermal expansion. With respect to the high electrical conductivities, the Ln0.6Sr0.4Co0.8Fe0.2O3 oxides are considered to be acceptable as mixed conducting component in composite cathode designs together with doped ceria electrolytes.

参考文献

[1]	Teraoka Y;Zhang H M;Okamoto K et al.Mixed Ionic-electronic Conductivity of La1-xSrxCo1-yFeyO3-δ Perovskite-type Oxides[J].Materials Research Bulletin,1988,23:51-58.
[2]	Beson S J;Waller D;Kilner J A .Degradation of La0.6Sr0.4Fe0.8Co0.2O3-δ in Carbon Dioxide and Water Atmospheres[J].Journal of the Electrochemical Society,1999,146:1305-1309.
[3]	Tsai CY.;Ma YH.;Moser WR.;Pascucci MR.;Dixon AG. .Dense perovskite, La(1-x)A ' xFe1-yCoyO3-delta (A '=Ba, Sr, Ca), membrane synthesis, applications, and characterization[J].Journal of the American Ceramic Society,1998(6):1437-1444.
[4]	Tu H.Y.;Imanishi N.;Yamamoto O.;Takeda Y. .Ln_(0.4)Sr_(0.6)Co_(0.8)Fe_(0.2)O _(3-δ) (Ln = La, Pr, Nd, Sm, Gd) for the electrode in solid oxide fuel cells[J].Solid state ionics,1999(3/4):277-281.
[5]	Qiu L.;Ichikawa T.;Hirano A.;Imanishi N.;Takeda Y. .Ln(1-x)Sr(x)Co(1-y)Fe(y)O(3-delta) (Ln=Pr, Nd, Gd; x=0.2, 0.3) for the electrodes of solid oxide fuel cells[J].Solid state ionics,2003(1/2):55-65.
[6]	Kharton VV.;Kovalevsky AV.;Viskup AP.;Shaula AL.;Figueiredo FM. Naumovich EN.;Marques FMB. .Oxygen transport in Ce0.8Gd0.2O2-delta-based composite membranes[J].Solid state ionics,2003(3/4):247-258.
[7]	Riza F;Ftikos Ch;Tietz F et al.Preparation and Characterization of Ln0.8Sr0.2Fe0.8Co0.2O3-δ (Ln=La,Pr,Nd,Sm,Eu,Gd)[J].Journal of the European Ceramic Society,2001,21:1769-1773.
[8]	Dasgupta N.;Krishnamoorthy R.;Jacob KT. .Crystal structure, thermal expansion and electrical conductivity of Nd0.7Sr0.3Fe1-xCoxO3 (0 <= x <= 0.8)[J].Materials Science & Engineering, B. Solid-State Materials for Advanced Technology,2002(3):278-286.
[9]	Dyck C R;Peterson R C;Yu Z B et al.Crystal Structure,Thermal Expansion and Electrical Conductivity of Dual-phase Gd0.8Sr0.2Co1-yFeyO3-δ (0≤y≤1.0)[J].Solid State Ionics,2005,176:103-108.
[10]	Wang SR.;Kato T.;Nagata S.;Honda T.;Kaneko T.;Iwashita N.;Dokiya M. .Performance of a La0.6Sr0.4Co0.8Fe0.2O3-Ce0.8Gd0.2O1.9-Ag cathode for ceria electrolyte SOFCs[J].Solid state ionics,2002(3/4):203-210.
[11]	Katsuki M.;Wang SR.;Dokiya M.;Hashimoto T. .High temperature properties of La0.6Sr0.4Co0.8Fe0.2O3-delta oxygen nonstoichiometry and chemical diffusion constant[J].Solid state ionics,2003(3):453-461.
[12]	Xu Q;Huang D P;Chen W et al.Citrate Method Synthesis,Characterization and Mixed Electronic-ionic Conduction Properties of La0.6Sr0.4Co0.8Fe0.2O3 Perovskite-type Complex Oxides[J].Scripta Materialia,2004,50:165-170.
[13]	Qing Xu;Duan-ping Huang;Wen Chen .Influence of sintering temperature on microstructure and mixed electronic-ionic conduction properties of perovskite-type La_(0.6)Sr_(0.4)Co_(0.8)Fe_(0.2)O_3 ceramics[J].Ceramics International,2004(3):429-433.
[14]	Tai LW.;Anderson HU.;Sparlin DM.;Sehlin SR.;Nasrallah MM. .STRUCTURE AND ELECTRICAL PROPERTIES OF LA1-XSRXCO1-YFEYO3 .1. THE SYSTEM LA0.8SR0.2CO1-YFEYO3[J].Solid state ionics,1995(3/4):259-271.
[15]	Tai LW.;Anderson HU.;Sparlin DM.;Sehlin SR.;Nasrallah MM. .STRUCTURE AND ELECTRICAL PROPERTIES OF LA1-XSRXCO1-YFEYO3 .2. THE SYSTEM LA1-XSRXCO0.2FE0.8O3[J].Solid state ionics,1995(3/4):273-283.
[16]	Kostogloudis G. Ch.;Ftikos Ch. .Properties of A-site-deficient La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8) O_(3-δ)-based perovskite oxides[J].Solid state ionics,1999(1/2):143-151.
[17]	Stevenson JW.;Carneim RD.;Pederson LR.;Weber WJ.;Armstrong TR. .ELECTROCHEMICAL PROPERTIES OF MIXED CONDUCTING PEROVSKITES LA(1-X)M(X)CO(1-Y)FE(Y)O(3-DELTA) (M=SR,BA,CA)[J].Journal of the Electrochemical Society,1996(9):2722-2729.
[18]	S. Uhlenbruck;F. Tietz .High-temperature thermal expansion and conductivity of cobaltites: potentials for adaptation of the thermal expansion to the demands for solid oxide fuel cells[J].Materials Science & Engineering, B. Solid-State Materials for Advanced Technology,2004(3):277-282.
[19]	Deng ZQ.;Zhang GG.;Liu W.;Peng DK.;Chen CS. .Phase composition, oxidation state and electrical conductivity of SrFe1.5-xCoxOy[J].Solid state ionics,2002(Pt.A):735-739.
[20]	Torrance J B;Lacorre P;Nazzal A I et al.Systematic Study of Insulator-metal Transition in Perovskite RNiO3 (R=Pr,Nd,Sm,Eu) due to Closing of Charge-transfer Gap[J].Physical Review B,1992,45:8209-8212.
[21]	Cherif K.;Dhahri J.;Dhahri E.;Oumezzine M.;Vincent H. .Effect of the A cation size on the structural, magnetic, and electrical properties of perovskites (La1-xNdx)(0.7)Sr0.3MnO3[J].International Journal of Quantum Chemistry,2002(2):466-471.
[22]	Kostogloudis G Ch;Fertis P;Ftikos Ch .The Perovskite Oxide System Pr1-xSrxCo1-yMnyO3-δ:Crystal Structure and Thermal Expansion[J].Journal of the European Ceramic Society,1998,18:2209-2215.
[23]	Kharton V V;Yaremchenko A A;Patrakeev M V et al.Thermal and Chemical Induced Expansion of La0.3Sr0.7(Fe,Ga)O3-δ Ceramics[J].Journal of the European Ceramic Society,2003,23:1417-1426.
[24]	Dusastre V.;Kilner J.A. .Optimisation of composite cathodes for intermediate temperature SOFC applications[J].Solid state ionics,1999(1/2):163-174.

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材料期刊网

Structure Electrical Conducting and Thermal Expansion Properties of Ln0.6Sr0.4Co0.8Fe0.2O3 (Ln=La,Pr,Nd,Sm)Ceramics

参考文献