Experimental studies on the ionic (protonic) transport in ammonium para-tungstate pentahydrate

Proton transport in ammonium para-tungstate pentahydrate (NH₄)₁₀W₁₂O₄₁.5H₂O (APT.5H₂O) has been established using coulometry transient ionic current IR and electrical conductivity measurements along with the TGA/DTA results of Kiss and co-workers. The mobile ions are NH₄⁺, H⁺ and O^2-. The ions (H⁺ and O^2-) are the products of electrolysis of the inter-layer water. The temperature dependence of the electrical conductivity has been correlated with the accompanying dehydration and de-ammoniation reaction of APT.5H₂O.