X-Ray Absorption Study of the Local Structure At Potassium and Rubidium in K3-x
RbxC60

Nowitzke, G.; Dumschat, J.; Wortmann, G.; Werner, H.; Schlögl, Robert

doi:10.1080/10587259408051708

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X-Ray Absorption Study of the Local Structure At Potassium and Rubidium in K_3-xRb_xC₆₀

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Nowitzke, G., Dumschat, J., Wortmann, G., Werner, H., & Schlögl, R. (1994). X-Ray Absorption Study of the Local Structure At Potassium and Rubidium in K_3-xRb_xC₆₀. Molecular Crystals and Liquid Crystals Science and Technology Section A, 245(1), 321-326. doi:10.1080/10587259408051708.

Cite as: https://hdl.handle.net/21.11116/0000-0009-8E35-C

Abstract

X-ray absorption fine structure (EXAFS and XANES) studies of the K-edges of potassium and rubidium in K₃C₆₀, K₂RbC₆₀ and Rb₃C₆₀ reveal the local structure and site preferences of the alkali metals. Both K and Rb ions on tetrahedral interstices exhibit regular positions with respect to the C₆₀ neighbours in agreement with crystallographic data, while for Rb ions located on octahedral interstices an off-center position is found. The K₂RbC₆₀ sample exhibits a clear preferential site occupation of the octahedral site by Rb, which is also reflected by the lattice constant, and indications for structural rearrangement of the Rb ions on octahedral sites around 50 K.