Thermoelectrical properties of the compounds ScM^VIIISb and YM^VIIISb (M^VIII  Ni, Pd, Pt)

Abstract

The research into new materials with good thermoelectric properties has revealed new compounds consisting of metallic elements (Bando Y,

Concepts and Models in Bioinorganic Chemistry. Edited by Heinz‐Bernhard Kraatz and Nils Metzler‐Nolte.

“…In comparison with HgTe, most half‐Heusler TIs have stable chemical properties, and films of these compounds can be easily prepared by sputtering, a commonly used technique for device fabrication. The half‐Heusler YPtSb is close to the border between the trivial semiconductors and topological insulators, and it has a narrow gap of around 0.16 eV 15. Every 0.01 Å increase in the lattice constant along the c ‐axis has been calculated to result in about a 20 meV energy difference between the inverted bands.…”

Magnetic, transport and thermal properties of single crystal Co2FeGa

“…This follows from the kinetic expression for thermal conductivity, κ = NCvl, where N is the number of thermal carriers, C the specific heat, v the group velocity (usually assumed to be constant), and l the carrier mean free path. The contribution of the lattice to thermal conductivity at high temperatures can be extrapolated by using the Debye approximation [27], l ∼ 1/T. At 50 K, l equals a characteristic inter-defect spacing and stops evolving as T decreases.…”

“…That is, dκ/dT > 0, which is a typi- cal feature of phonon scattering in an amorphous solid and a disordered system, rather than in an ordered solid, of which experiences a decrease in κ(T) (varying with T −1 ) [27] as the temperature increases to below the Debye value, θ D . Because it occurs in a single crystal, however, this behavior cannot be due to any quenched structural disorder as in amorphous materials.…”

Role of Structures on Thermal Conductivity in Thermoelectric Materials

“…6.14). In these series, LnPdSb-type compounds (Ln= Sr, Y, rare earths, specially Er) have high Seebeck coefficients below 300K [Mastronardi 1999], [Oestreich 2003], which could lead to interesting substituted materials for cooling. Zn 4 Sb 3 exists under three crystallographic varieties: -phase stable below -10°C, -phase from -10°C to 492°C and -phase from 492°C to the melting temperature of 566°C.…”