Multinuclear NMR and Powder X-ray Diffraction Studies of Si and Sn Clathrates of Alkali

December 1, 2001

Conference Paper

Multinuclear NMR and Powder X-ray Diffraction Studies of Si and Sn Clathrates of Alkali

Abstract

The Structure I type binary metal clathrates of K/Si, Rb/Si and Cs/Sn have been synthesised and studied by powder X-ray diffraction and solid state NMR. Rietveld analysis shows that in all three materials some of the cages are empty, and that in the Cs/Sn clathrate there are vacancies in the Sn framework. The NMR results yield Knight shifts for 29Si and 39K and confirm that the Cs/Sn clathrate is not conducting. Many of the features of the NMR spectra can be understood in terms of the distributions of atom vacancies.

Revised: October 7, 2008 | Published: December 1, 2001

Citation

Ferguson M.J., I.L. Moudrakovski, C.I. Ratcliffe, and J.S. Tse. 2001. Multinuclear NMR and Powder X-ray Diffraction Studies of Si and Sn Clathrates of Alkali. In Thermoelectric Materials 2001 - Research and Applications. Symposium, 691, 451-456. Warrendale, Pennsylvania:Materials Research Society.