The electrical conductivities of dodecamolybdophosphoric acid H3Mo12PO40·29H2O and dodecatungstophosphoric acid H3W12PO40·29H2O crystals were measured. Remarkably high conductivities of 0.18 and 0.17 mho cm−1 at 25°C, and low activation energies of 15.5 and 13.7 kJ/mol were observed for the former and the latter, respectively.
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Nakamura et al. (1979) studied this question.