Strongly Decoupled Europium and Iron Vibrational Modes in Filled Skutterudites

Gary J. Long, Missouri University of Science and Technology
Fernande Grandjean, Missouri University of Science and Technology
Ercan E. Alp
Wolfgang Sturhahn
Charles E. Johnson
Dennis E. Brown
Olaf Leupold
Rudolf Rüffer
Raphaël P. Hermann

This document has been relocated to

There were 10 downloads as of 28 Jun 2016.


The europium partial vibrational density of states (DOS) in EuFe4Sb12 and the iron partial vibrational DOS in both EuFe4Sb12 and Ce57Fe4Sb12 have been obtained by nuclear inelastic scattering. The results reveal the strong independence of the iron and rare-earth vibrational modes. The cage filling europium only participates significantly to the low-energy local vibrational modes. The force constants have been obtained from the measured probability of nuclear absorption. The energies of the peaks in the europium and iron DOS are in excellent agreement with the calculated DOS in LaFe4Sb12. The results indicate that nuclear inelastic scattering is the technique of choice for the study of the localized vibrational modes in thermoelectric "phonon glass" materials.