Interleaved oxovanadium cations in the rancieite manganese oxide δ‐MnO2

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Abstract
A mixed vanadium manganese oxide was synthesized through a chimie douce route. The synthesis proceeds via a cationic exchange reaction occurring between the layers of a synthetic rancieite, a lamellar manganic acid. The vanadium atoms were found to be at a distance from Mn close to the Mn–Zn distance in chalcophanite, a model for the phyllomanganates. XAS refinements did not reveal the presence of manganese atoms between the layers of either the protonic or Li-exchanged forms of the rancieite. Li insertion is largely impeded by the presence of dioxovanadium cations, which seem to be accommodated into one of the Li potential sites present in the Li-exchanged phase.

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