Abstract
Local structure of one-dimensional selenium chains in cancrinite channels have been studied by polarised X-ray absorption. Polarised EXAFS reveals that selenium atoms are one-fold coordinated and well-aligned along the c-axis of cancrinite. The obtained SeSe bond length is 2.40 ± 0.01 A ̊ . The results provide direct evidence for dimerisation of selenium chains and suggest incommensurate intercalation of dimers which do not form a triplet (π-bond) state or a dangling bond state. Highly anisotropic polarisation dependence of XANES demonstrate that antibonding 4p(σ ∗) states are partially filled suggesting a charge transfer from Na cations located in the channels.
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