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Most of the polyacid salts A x M y O z  of the transition elements M = Ti, V, Nb, Mo, W, U with layer structure can exchange the alkali or earth alkali ions A for other suitable cations. Especially suited are large organic ions such as alkylammonium ions whose large layer separation makes the interlayer cations accessible for the exchange reaction.

zeitschrift für naturforschung b

Schichtverbindungen der Polyanionenbildenden Nebengruppenelemente mit Kationenaustauschvermögen / Layer Compounds of Polyanion-Forming Transition Elements with Cation Exchange Capacity