This paper describes the thermoelectric properties of Fe1−yCrySr2ribbons 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 fory=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 fory=0∼0.7. The annealed ribbons consist of the &bgr; phase fory≤0.07, and of the &bgr; phase and the CrSi2phase for 0.07<y≤0.7. With increasingybelowy=0.07, the thermoelectric power and the electrical resistivity become small because of increase in hole density in the &bgr; phase. With increasingyfrom 0.07 to 0.1, the thermoelectric power and the electrical resistivity become large because hole density decreases with the appearance of the CrSi2phase in the &bgr; phase. Abovey=0.1, the thermoelectric power and the electrical resistivity decrease gradually with increasing the amount of the CrSi2phase. ©1995 American Institute of Physics.