Synthesis of Sr Doped HoCrO<sub>3</sub> Solid Solution Systems and Their Electrical Properties Synthesis of Sr Doped HoCrO<sub>3</sub> Solid Solution Systems and Their Electrical Properties

Sung-Ho Park; Tae-Yun Kwon

Journal of Industrial and Engineering Chemistry, Vol.6, No.4, 226-230, July, 2000

Synthesis of Sr Doped HoCrO₃ Solid Solution Systems and Their Electrical Properties Synthesis of Sr Doped HoCrO₃ Solid Solution Systems and Their Electrical Properties

Sung-Ho Park^†, and Tae-Yun Kwon¹

Department of Chemistry and New Material, Jeonju University, Jeonju 560-759, Korea
¹Institute for Engineering and Technology, Jeonju University, Jeonju 560-759, Korea

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Ho_1-xSrxCrO₃ systems, with perovskite structures, were synthesized for x=0, 0.05, 0.1, 0.2 at 1300℃ under atmospheric pressure. The results of X-ray analysis reveals that these prepared systems forms orthorhombic structures. Also, the HoCrO₃ systems which were doped with Sr cations on the site of Ho cations, exhibited a linear increase in their cell volume. It was found that the lattice parameter and reduced volume increased as the doping level of Sr²⁺ increased. From the measurements of D.C conductivity, the activation energy obtained from the conductivity dependence on temperature was 0.18 eV. The conduction mechanism would appear to be the hopping model of electron conduction.

Keywords:SOFC;HoCrO₃;perovskite;solid solution;electrical conductivity

[References]

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[Referenced By]

[1] Mihn NQ, J. Am. Ceram. Soc., 76(3), 563 (1993)

[2] Appleby AJ, Foulkes FR, Fuel Cell Handbook, pp. 579-611, Van Nonstrand Reinhold, NY (1988)

[3] Geller S, J. Chem. Phys., 24(6), 1236 (1956)

[4] Geller S, Acta Crystallogr., 10, 243 (1957)

[5] Satoh H, Koseki SI, Takagi M, Chung WY, Kamegashira N, J. Alloy. Compd., 259(1-2), 176 (1997)

[6] Parkin IP, Komarov AV, Fang Q, Polyhedron, 15(18), 3117 (1996)

[7] Ruiz JS, Anthony AM, Fox M, Acad. Sci., Paris, 264B, 1271 (1967)

[8] Geller S, Raccah PM, Phys. Rev., B, Condens. Matter, 2, 1167 (1970)

[9] Khattak CP, Cox DE, Mater. Res. Bull., 12, 463 (1977)

[10] Yo CH, Lee ES, Pyon MS, J. Solid State Chem., 73, 411 (1988)

[11] Valdes LB, Proc. I.R.E., 42, 420 (1954)

[12] Choi JS, Kang YH, Kim KH, J. Phys. Chem., 81, 1286 (1979)

[13] Lee DH, Cho SK, Yo CH, Kim KH, Park SH, J. Mater. Chem. Phys., 37, 17 (1994)

[14] Roh KS, Ryu KH, Yo CH, J. Solid State Chem., 142, 288 (1999)

[15] Magneli A, Acta Crystallogr., 6, 495 (1953)

[16] Shannon RD, Prewitt CT, Acta Crystallogr. Sect. A, 32, 751 (1976)

[17] Tien TY, Subbarao EC, J. Chem. Phys., 39, 1041 (1963)

[18] Webb JB, Sayer M, Mansingh A, Can. J. Phys., 55, 1725 (1977)

[19] Karim DP, Aldred AT, Phys. Rev., B, Condens. Matter, Condens. Matter, 20(6), 2255 (1979)