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Perovskite La0.9Sr0.1FeO3 ceramics have been synthesized at 1250℃，1300℃ and 1350℃ by the conventional solid-state reaction technique. From their crystal structures determined by powder X-ray diffraction，we found that the lattice volume decreases with increasing sintering temperature. The scanning electronic microscope (SEM) images of surface microstructures of the samples show that the average grain size increases with increasing sintering temperature. The electrical resistivity and Seebeck coefficient have been measured between room temperature and 800℃. At low temperatures，the electrical resistivity shows a semiconductivity-like behavior. With further increasing of temperature，the electrical resistivity slightly increases. An adiabatic hopping conduction mechanism of small-polarons is suggested from the temperature dependence of the electrical resistivity，which has different activation energies at low and high temperatures. The Seebeck coefficient rapidly decreases with increasing temperature，and reaches a saturation value about 600℃. With further increasing of temperature，the Seebeck coefficient slightly increases. With the increase of sintering temperature，the electrical resistivity decreases，while the Seebeck coefficient increases. Therefore，the power factor increases with increasing sintering temperature. The highest power factor of 90 μW/K2m was obtained at 727℃ for sample sintered at 1350℃.
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Keywords:
- LaFeO3 ceramics /
- thermoelectric properties /
- sintering temperature
[1] ［1］ Terasaki I，Sasago Y，Uchinokura K 1997 Phys. Rev. B 56 R12685
[2] ［2］ Chen X Y，Xu X F，Hu R X，Ren Z，Xu Z A，Cao G H 2007 Acta Phys.Sin. 56 1627 (in Chinese) ［陈晓阳、徐象繁、胡荣星、任之、许祝安、曹光旱 2007 物理学报 56 1627］
[3] ［3］Yu M, Yang H S, Ruan K Q, Li P C, Li H L, Chai Y S, Cao L Z 2002 Acta Phys. Sin. 51 663 (in Chinese) ［于旻、杨宏顺、阮可青、李鹏程、李慧玲、柴一晟、曹烈兆 2002 物理学报 51 663］
[4] ［4］ Okuda T，Nakanishi K，Miyasaka S，Tokura Y 2001 Phys. Rev. B 63 113104
[5] ［5］ Ohta S，Nomura T，Ohta H，Hirano M，Hosono H，Koumoto K 2005 Appl. Phys. Lett. 87 092108
[6] ［6］ He T，Chen J Z，Calvarese T G，Subramainan M A 2006 Solid State Sci. 8 467
[7] ［7］ Ullmann H，Trofimenko N，Stover F，Stver D，Ahmad-Khanlou A 2000 Solid State Ionics 138 79
[8] ［8］ Iwasaki K，Ito T，Yoshino M，Matsui T，Nagasaki T，Arita Y J 2006 J. Alloys Comp. 430 297
[9] ［9］ Jung W H 2001 Physica B 299 120
[10] ］ Kobayashi K，Yamaguchi S，Tsunoda T，Imai Y 2001 Solid State Ionics 144 123
[11] ］Jiang J, Li Y L, Xu G J, Cui P, Wu T, Chen L D, Wang G 2007 Acta Phys. Sin. 56 2858 (in Chinese) ［蒋俊、李亚丽、许高杰、崔平、吴汀、陈立东、王刚 2007 物理学报 56 2858］
[12] ］ Zhou X D，Wang J B，Thomsen E C 2006 J. Electrochem. Soc. 153 J133
[13] ］ Mott N F，Davis E A 1971 Electrical Process in Non-Crystal-line Materials (Oxford：Oxford Univ.)
[14] ］ Jung W H，Iguchi E 1998 J. Phys. D：Appl. Phys. 31 794
[15] ］ Weber W J，Griffin C W，Bates J L 1987 J. Am. Ceram. Soc. 70 265
[16] ］ Wood C，Emin D 1984 Phys. Rev. B 29 4582
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[1] ［1］ Terasaki I，Sasago Y，Uchinokura K 1997 Phys. Rev. B 56 R12685
[2] ［2］ Chen X Y，Xu X F，Hu R X，Ren Z，Xu Z A，Cao G H 2007 Acta Phys.Sin. 56 1627 (in Chinese) ［陈晓阳、徐象繁、胡荣星、任之、许祝安、曹光旱 2007 物理学报 56 1627］
[3] ［3］Yu M, Yang H S, Ruan K Q, Li P C, Li H L, Chai Y S, Cao L Z 2002 Acta Phys. Sin. 51 663 (in Chinese) ［于旻、杨宏顺、阮可青、李鹏程、李慧玲、柴一晟、曹烈兆 2002 物理学报 51 663］
[4] ［4］ Okuda T，Nakanishi K，Miyasaka S，Tokura Y 2001 Phys. Rev. B 63 113104
[5] ［5］ Ohta S，Nomura T，Ohta H，Hirano M，Hosono H，Koumoto K 2005 Appl. Phys. Lett. 87 092108
[6] ［6］ He T，Chen J Z，Calvarese T G，Subramainan M A 2006 Solid State Sci. 8 467
[7] ［7］ Ullmann H，Trofimenko N，Stover F，Stver D，Ahmad-Khanlou A 2000 Solid State Ionics 138 79
[8] ［8］ Iwasaki K，Ito T，Yoshino M，Matsui T，Nagasaki T，Arita Y J 2006 J. Alloys Comp. 430 297
[9] ［9］ Jung W H 2001 Physica B 299 120
[10] ］ Kobayashi K，Yamaguchi S，Tsunoda T，Imai Y 2001 Solid State Ionics 144 123
[11] ］Jiang J, Li Y L, Xu G J, Cui P, Wu T, Chen L D, Wang G 2007 Acta Phys. Sin. 56 2858 (in Chinese) ［蒋俊、李亚丽、许高杰、崔平、吴汀、陈立东、王刚 2007 物理学报 56 2858］
[12] ］ Zhou X D，Wang J B，Thomsen E C 2006 J. Electrochem. Soc. 153 J133
[13] ］ Mott N F，Davis E A 1971 Electrical Process in Non-Crystal-line Materials (Oxford：Oxford Univ.)
[14] ］ Jung W H，Iguchi E 1998 J. Phys. D：Appl. Phys. 31 794
[15] ］ Weber W J，Griffin C W，Bates J L 1987 J. Am. Ceram. Soc. 70 265
[16] ］ Wood C，Emin D 1984 Phys. Rev. B 29 4582
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