ON THE PROTON CONDUCTOR (H3O)ZR2(PO4)3
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The compound HZr2(PO4)3 was converted to (H3O)Zr2(PO4)3 by refluxing in water for 12 or more hours. The water is lost above 150C to regenerate the original triphosphate. The hydronium ion phase is rhombohedral with hexagonal axes of a = 8.760(1) and c = 23.774(4) A . Proton conduction in these compounds was investigated by an ac impedance method over the frequency range 5Hz - 10MHz. The activation energy for (H3O)Zr2(PO4)3 in the temperature range of 25 to 150C was 0.56eV while the corresponding value for HZr2(PO4)3 (125 - 300C) was 0.44eV. 1984.