Title :
Thermoelectric property and microstructure of iron-silicide doped with Co and Ag
Author :
Morimura, T. ; Hasaka, M. ; Watanabe, T.
Author_Institution :
Graduate Sch. of Sci. & Technol., Nagasaki Univ., Japan
Abstract :
β-FeSi2 is enumerated as a prospective material for thermoelectric conversion as well as photoelectric conversion and light emitting. In this paper, thermoelectric property and microstructure of β-FeSi2 sintered with Ag were investigated by the measurements of Seebeck coefficient, electrical resistivity, X-ray diffraction and transmission electron microscopic observation. α-FeSi and ε-FeSi2 were observed in an as-cast sample. β-FeSi2 was produced by transformation from α-FeSi and ε-FeSi2 after annealing at 1073K. β-FeSi2 hardly contained Ag but contained Co as a dopant. Ag precipitated in the boundaries of β-FeSi2 grains and between particles. Power factor was enhanced by Ag addition because of the large decrease in electrical resistivity and the slight decrease in Seebeck coefficient. The distribution of Ag was important factor for the power factor. The relation between microstructures and thermoelectric properties was revealed.
Keywords :
Seebeck effect; X-ray diffraction; cobalt; crystal microstructure; electrical resistivity; grain boundaries; iron compounds; photoelectricity; silver; thermoelectricity; transmission electron microscopy; β-FeSi2:Ag; β-FeSi2:Co; 1073 K; FeSi2:Ag; FeSi2:Co; Seebeck coefficient; X-ray diffraction; electrical resistivity; microstructure; photoelectric conversion; power factor; thermoelectric property; transmission electron microscopic; Atmosphere; Chemical technology; Electric resistance; Electric variables measurement; Furnaces; Microstructure; Reactive power; Semiconductor materials; Thermoelectricity; Transmission electron microscopy;
Conference_Titel :
Thermoelectrics, 2003 Twenty-Second International Conference on - ICT
Print_ISBN :
0-7803-8301-X
DOI :
10.1109/ICT.2003.1287472
