Effect of Cr and Fe Substitution on the Transport Properties of the Nowotny Chimney–Ladder MnSi δ (1.73 < δ < 1.75) Compounds
- 344 Downloads
Manganese silicides MnSi δ (1.73 < δ < 1.75) have been substituted with substantial amounts of Cr (<25%) and Fe (<30%) at the Mn site to study the resistivity (ρ), Seebeck (α) and Hall coefficients, and thermal conductivity of the resulting compositions. Only marginal reduction in ρ is observed upon substituting Cr to as much as 25%. Surprisingly, the Seebeck coefficient is positive even after substituting Fe to 20%. The Hall coefficients are positive, and the carrier concentrations seem to be less sensitive to substitution by either Cr or Fe. The promising aspect of this system is the low lattice thermal conductivity, which is approximately 2.5 W/m K at 300 K for most compositions.
KeywordsThermoelectrics manganese silicides Seebeck and Hall coefficients
Unable to display preview. Download preview PDF.
- 1.H. Nowotny, The Chemistry of Extended Defects in Non-Metallic Solids, ed. L.R. Eyring and M. O’Keeffe (Amsterdam: North-Holland, 1970), p. 223.Google Scholar
- 7.E.N. Nikitin and V.I. Tarasov, Sov. Phys. Solid State 13, 2938 (1972).Google Scholar
- 10.M.I. Fedorov and V.K. Zaitsev, Thermoelectrics Handbook, ed. D.M. Rowe (Boca Raton: CRC, 2006), Chap. 31.Google Scholar
- 23.Y.I. Ravich, B.A. Efimova, and I.A. Smirov, Semiconducting Lead Chalcogenides (New York: Plenum, 1970), p. 155.Google Scholar