Thermoelectric properties of Fe1-yCrySi2 ribbons

This paper describes the thermoelectric properties of Fe1-yCrySr2 ribbons and bulks fabricated by spin-casting and usual casting. The thermoelectric powers, the electrical resistivities, the power factors of the ribbons and the bulks were measured, and the X-ray diffraction patterns, the scanning electron microscopic images were observed. The thermoelectric powers, the electrical resistivities and the power factors of the ribbons and the bulks for y=0∼0.7 become large after annealing. The thermoelectric power, the power factor of the annealed ribbon are larger than those values of the annealed bulk for y=0∼0.7. The annealed ribbons consist of the β phase for y≤0.07, and of the β phase and the CrSi2 phase for 0.07<y≤0.7. With increasing y below y=0.07, the thermoelectric power and the electrical resistivity become small because of increase in hole density in the β phase. With increasing y from 0.07 to 0.1, the thermoelectric power and the electrical resistivity become large because hole density decreases with the appearance of the CrSi2 phase in the β phase. Above y=0.1, the thermoelectric power and the electrical resistivity decrease gradually with increasing the amount of the CrSi2 phase. copyright 1995 American Institute of Physics