TY - JOUR
T1 - Raman scattering of type-I clathrate compounds
T2 - A8Ga 16Ge30(A = Eu, Sr, Ba) and Sr8Ga 16Si30-xGex
AU - Takasu, Y.
AU - Hasegawa, T.
AU - Ogita, N.
AU - Udagawa, M.
AU - Suekuni, K.
AU - Avila, M. A.
AU - Takabatake, T.
PY - 2007/12/1
Y1 - 2007/12/1
N2 - Dynamical motions of a guest ion in type-I clathrate compounds have been studied by Raman scattering measurements. The anomalous temperature dependence of the guest phonon energy has been found not only for A8Ga 16Ge30(A=Ba, Sr, Eu), but also for A8Ga 16Si30-xGex(A = Ba, Sr). It has been found that the 4th order anharmonic potential is important to the guest ion motion. For Sr8Ga16Si30-xGex, the off-center rattling arises with the increase of Ge concentration, and it is confirmed that the off-center rattling plays an important role to the suppression of the lattice thermal conductivity.
AB - Dynamical motions of a guest ion in type-I clathrate compounds have been studied by Raman scattering measurements. The anomalous temperature dependence of the guest phonon energy has been found not only for A8Ga 16Ge30(A=Ba, Sr, Eu), but also for A8Ga 16Si30-xGex(A = Ba, Sr). It has been found that the 4th order anharmonic potential is important to the guest ion motion. For Sr8Ga16Si30-xGex, the off-center rattling arises with the increase of Ge concentration, and it is confirmed that the off-center rattling plays an important role to the suppression of the lattice thermal conductivity.
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U2 - 10.1088/1742-6596/92/1/012151
DO - 10.1088/1742-6596/92/1/012151
M3 - Article
AN - SCOPUS:58149517392
SN - 1742-6588
VL - 92
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012151
ER -