Lattice dynamics in the thermoelectric Zintl compound Yb[subscript 14]MnSb[subscript 11]
- DESY
The density of phonon states in the thermoelectric material Yb{sub 14}MnSb{sub 11} has been studied first by inelastic neutron scattering and second in an element-specific way by nuclear inelastic x-ray scattering. The low sound velocity of 1880(50) m/s as obtained from the density of phonon states can be identified as an important reason for the low heat transport in this system. The high melting temperature of Yb{sub 14}MnSb{sub 11} contrasts with the low energy of all phonons (<25 meV) and relates to an unusual lack of softening of phonon modes with temperature, when comparing the phonon density of states observed at ambient temperatures and at 1200 K. We have also measured the density of phonon states of the related Eu{sub 14}MnSb{sub 11} compound and of the thermoelectric Zintl phase Zn{sub 4}Sb{sub 3} in order to compare with related thermodynamic properties of Yb{sub 14}MnSb{sub 11} and to elucidate the different mechanisms of the heat conductivity reduction in Zintl phases.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- FOREIGN
- OSTI ID:
- 1036339
- Journal Information:
- Phys. Rev. B, Vol. 84, Issue (18) ; 11, 2011; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
High Temperature Thermoelectric Properties of Yb14MnSb11 Prepared from Reaction of MnSb with the Elements
Anomalous Hall Effect in Three Ferromagnets: EuFe4Sb12, Yb14MnSb11, and Eu8Ga16Ge30