Thermoelectric Properties of Ru2Si3-Based Chimney-Ladder Phases
The variations of the crystal structures and thermoelectric properties of the Ru1-xRexSiy chimney-ladder phases were studied as a function of the Re concentration. A series of chimney-ladder phases with a compositional formula of Ru1-xRexSi1.539+0.178x are formed in a wide compositional range, 0.14 ≤ x ≤ 0.76. The composition of the chimney-ladder phase is systematically deviated from the idealized composition satisfying the valence electron concentration rule: VEC=14. Measurements of thermoelectric properties reveal that the chimney-ladder phases exhibit n-type semiconducting behavior at low Re concentrations and p-type semiconducting behavior at high Re concentrations, which are well consistent with the prediction based on the deviation of the composition of the chimney-ladder phase from the idealized composition.
Young Won Chang, Nack J. Kim and Chong Soo Lee
K. Kishida et al., "Thermoelectric Properties of Ru2Si3-Based Chimney-Ladder Phases", Materials Science Forum, Vols. 561-565, pp. 463-466, 2007