The ion exchange of Li for Na in P2‐structure Na 2 / 3 [ Ni 1 / 3 Mn 2 / 3 ] O 2 to make T2‐structure Li 2 / 3 [ Ni 1 / 3 Mn 2 / 3 ] O 2 is studied. Electron micrographs show that the hexagonal plate‐like crystal habit is preserved during ion exchange. Ion exchange is successful and equivalent using both molten salts and concentrated Li + ‐ containing aqueous solutions. By controlling the Li:Na ratio in the ion exchange, it is possible to prepare an intermediate phase of approximate composition Li 1 / 3 Na 1 / 3 [ Ni 1 / 3 Mn 2 / 3 ] O 2 , where filled alkali layers of Li and Na alternate, thus doubling the c axis of the material. A summary of ion‐exchange reactions of Li for Na in other layered Na‐bronzes, such as P 3 ‐ Na 2 / 3 [ Ni 1 / 3 Mn 2 / 3 ] O 2 , O 3 ‐ Na [ Ni 1 / 2 Mn 1 / 2 ] O 2 , P 2 ‐ Na 2 / 3 [ Co x Mn 1 − x ] O 2 , P 3 ‐ Na , 2 / 3 [ Co x Mn 1 − x ] O 2 , P 2 ‐ Na 2 / 3 CoO 2 , P 2 ‐ Na 2 / 3 [ Fe 1 / 3 Mn 2 / 3 ] O 2 , P 2 ‐ Na 2 / 3 [ Fe 2 / 3 Mn 1 / 3 ] O 2 , P 2 ‐ Na 2 / 3 [ Mg 1 / 3 Mn 2 / 3 ] O 2 , P 2 ‐ Na 2 / 3 [ Ni 1 / 3 Mn 2 / 3 ] O 2 , and O 3 ‐ NaMnO 2 , is given.
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Paulsen et al. (2000) studied this question.