Abstract
The cation-exchange characteristics of K 2W 4O 13, with its tunnel framework structure, for univalent cations in molten nitrate salts just above their melting points have been investigated. From the results, K + ions in the tunnels were found be topotactically exchanged for Li +, Na +, Rb +, and Ag +, and the exchange ratios were found to follow the order; Rb + < Li + < Na + < Ag +. It was found that the host-guest reactions on K 2W 4O 13 produce new materials with this tunnel structure that cannot be prepared by the ordinary synthetic method.
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