ELECTRICAL-PROPERTIES OF CO-DOPED AND NI-DOPED BETA-FESI2

The Hall effect and electrical resistivity of iron disilicide, Fe1-xCo xSi2(0.01 less than or equal to x less than or equal to 0.03) and Fe1- yNiySi2 (0.01 less than or equal to y less than or equal to 0.03) have been measured in the temperature range between 80 and 300 K. The soli d solution Fe1-xCoxSi2 is n type over the measured temperature range, while the solid solution Fe1-yNiySi2 is p type below 160 K and n type above 160 K. The carrier concentration of Fe1-xCoxSi2 at 300 K, which is in good agreement with the Co atom concentration, is one order of m agnitude higher than that of Fe1-yNiySi2. The electron conduction at h igh temperatures for these solid solutions is explained by the small p olaron mechanism. (C) 1998 American Institute of Physics.