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 150°C 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 150°C was 0.56eV while the corresponding value for HZr2(PO4)3 (125 - 300°C) was 0.44eV. © 1984.
author list (cited authors)
Subramanian, M. A., Roberts, B. D., & Clearfield, A.