Transport properties of CuxCo4Sb11.7Te0.3 prepared by solid-state reaction

Multiscale Length Structural Investigation and Thermoelectric Performance of Double-Filled Sr0.2Yb0.2Co4Sb12: An Exceptional Thermal Conductivity Reduction by Filler Segregation to the Grain Boundaries

“…Indeed, filling the 2 a voids in the CoSb 3 lattice with additional elements has yielded encouraging results, especially when combined with other approaches, such as high-pressure torsion. ,, The single-filled derivatives are typically represented by the formula M y Co 4 Sb 12 , with the filler atoms enclosed in an icosahedral cage formed by tilted [CoSb 6 ] octahedra, which are interconnected by Sb–Sb atoms shaping rectangular [Sb 4 ] rings. By following this strategy, numerous studies have reported the thermoelectric performance enhancement by using rare-earth, − alkali, − alkali-earth, − and transition-metal elements − as fillers. Additionally, multiple-filled skutterudite compounds can be achieved by simultaneously employing different filler elements, leading to enhanced phonon scattering across a wider range of wavelengths. , The phonon scattering mechanisms in filled M y Co 4 Sb 12 have been extensively discussed, with previous scenarios describing resonant phonon scattering of the rattlers as Einstein-type isolated harmonic oscillators, while further phonon inelastic neutron studies have revealed the coupling of lattice vibrations.…”