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Li 3 TaO 4 , Li 3 BiO 4 and Li 3 UO 4 have structures based on a 3:1 order of univalent and pentavalent cations in the rocksalt lattice, the order being different for the three compounds. Li 4 WO 5 and Li 4 MoO 5 also have a structure based on the rocksalt lattice. Li 5 GaO 4 has an antifluorite superstructure.
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G. Blasse (1964) studied this question.
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