Abstract
The conductivity of antiferroelectric ND 4D 2AsO 4 single crystals has been measured as a function of temperature, especially near the Néel temperature. At the Néel temperature the conductivity shows a vertical decrease to a lower value indicating that the mechanism of conduction is connected to the shift of the protons during the phase transition. This conductivity mechanism in potassium and ammonium dihydrogen phosphates and arsenates has been previously proposed to include proton motion along hydrogen bonds and proton jumps across the phosphate or arsenate tetrahedra. The jump activation energy for proton mobility in ND 4D 2AsO 4 is found to be 10.5 kcal/mole and the room temperature conductivity is 9.91 × 10 −10 ohm −1 cm −1.
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