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Abstract
Type-I germanium clathrates comprised of Ga/Ge tetrakaidecahedra and dodecahedra cages that host alkaline earth atoms exemplify the properties of good thermoelectrics where the guest-atom anharmonic vibrations play a major role. However, while the host lattice–guest atom interaction is essential for this class of materials it is at the same time difficult to investigate due to the random Ga/Ge site occupation in the host lattice. In the present 71Ga NMR study of Sr8Ga16Ge30 and Ba8Ga16Ge30 samples we extract different Ga crystallographic site contributions from otherwise complex NMR spectra by exploring differences in their spin–lattice relaxation rates. Such approach opens a unique possibility for a site-selective study that directly proves non-negligible interaction of the anisotropic rattling motions of endohedral Sr with Ga atoms occupying the specific \(24k\) sites of larger tetrakaidecahedral cages. This interaction affects electron–phonon coupling and modifies the local chemical environment — possi...
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