Effect of Heat Treatment Conditions on (Sr,Ca)FeO<sub>3-y</sub> Perovskite System

Eun-Seok Lee

Journal of Industrial and Engineering Chemistry, Vol.4, No.2, 73-77, June, 1998

Effect of Heat Treatment Conditions on (Sr,Ca)FeO_3-y Perovskite System

Department of Chemistry, Chongju University, Chongju 360-764, Korea

The behavior of Sr_1-xCa_xFe³⁺_1-τFe⁴⁺_τO_3-y (where, Y=(1-τ)/2) solid solution with a composition of x=0.1, 0.2, 0.3, and 0.4 was studied under various environments such as in N₂ (1 atm), air, and O₂ (1 atm). It was found that the samples heat-treated in N₂ contain very small amount of Fe⁴⁺ion and their 3-y values are nearly 2.5. The samples (heat-treated in air) of x=0.3 and 0.4 didn't show reversible weight changes in cooling process. Conductivities of each sample were increased in the order of (fired in N₂)-(in O₂)-(in air) at constant temperature. The activation energies of all the samples were in the range of 0.07∼0.45 eV depending on heating conditions.

[References]

Yo CH, Lee ES, Pyon MS, J. Solid State Chem., 58, 411 (1988)
Demazeau G, Li-Ming Z, Fournes L, Pouchard M, Hagenmuller P, J. Solid State Chem., 72, 31 (1988)
Menil F, Kinomura N, Fournes L, Portier J, Hagenmuller P, Phys. Stat. Sol., 64, 261 (1981)
Hombo J, J. Solid State Chem., 84, 138 (1990)
Matsmoto Y, Kurimoto J, Sato E, J. Electroanal. Chem., 127, 2360 (1980)
Matsmoto Y, Yamada S, Nishida T, Sato E, J. Electroanal. Chem., 102, 77 (1979)
Grenier JC, Ea N, Pouchard M, Hagenmuller P, J. Solid State Chem., 58, 243 (1985)
Fournes L, Potin Y, Grenier JC, Demazeau G, Pouchard M, Solid State Commun., 62, 239 (1987)
Takeda Y, Kanno K, Nakayama N, Yamamoto O, J. Solid State Chem., 63, 237 (1986)
Gallagher PK, Macchesney JB, Buchanan DNE, J. Chem. Phys., 43, 516 (1965)
Lee JD, Master Thesis Chongju Univ. (1997)
Lee ES, J. Ind. Sci. Res., 10, 167 (1992)
Yo CH, Lee ES, Pyon WB, Pyon MS, J. Korean Chem. Soc., 32, 3 (1988)
Lee ES, J. Ind. Eng. Chem., 2(2), 151 (1996)
Yamamura H, Hadena H, Shirasaki S, Dakada K, J. Solid State Chem., 86, 1 (1981)
Waugh JS, Technical Report, Massachusetts Ins. Tech., No. 152 (1960)
Clevenger TR, J. Am. Ceram. Soc., 46, 207 (1963)

[Referenced By]

[1] Yo CH, Lee ES, Pyon MS, J. Solid State Chem., 58, 411 (1988)

[2] Demazeau G, Li-Ming Z, Fournes L, Pouchard M, Hagenmuller P, J. Solid State Chem., 72, 31 (1988)

[3] Menil F, Kinomura N, Fournes L, Portier J, Hagenmuller P, Phys. Stat. Sol., 64, 261 (1981)

[4] Hombo J, J. Solid State Chem., 84, 138 (1990)

[5] Matsmoto Y, Kurimoto J, Sato E, J. Electroanal. Chem., 127, 2360 (1980)

[6] Matsmoto Y, Yamada S, Nishida T, Sato E, J. Electroanal. Chem., 102, 77 (1979)

[7] Grenier JC, Ea N, Pouchard M, Hagenmuller P, J. Solid State Chem., 58, 243 (1985)

[8] Fournes L, Potin Y, Grenier JC, Demazeau G, Pouchard M, Solid State Commun., 62, 239 (1987)

[9] Takeda Y, Kanno K, Nakayama N, Yamamoto O, J. Solid State Chem., 63, 237 (1986)

[10] Gallagher PK, Macchesney JB, Buchanan DNE, J. Chem. Phys., 43, 516 (1965)

[11] Lee JD, Master Thesis Chongju Univ. (1997)

[12] Lee ES, J. Ind. Sci. Res., 10, 167 (1992)

[13] Yo CH, Lee ES, Pyon WB, Pyon MS, J. Korean Chem. Soc., 32, 3 (1988)

[14] Lee ES, J. Ind. Eng. Chem., 2(2), 151 (1996)

[15] Yamamura H, Hadena H, Shirasaki S, Dakada K, J. Solid State Chem., 86, 1 (1981)

[16] Waugh JS, Technical Report, Massachusetts Ins. Tech., No. 152 (1960)

[17] Clevenger TR, J. Am. Ceram. Soc., 46, 207 (1963)