Temperature dependence of the electrical conductivity of orthophosphoric acid in porous glass

Temperature dependence of the proton conductivity of a 85 wt % solution of orthophosphoric acid in a set of porous glasses with predominant channel radii of 4.5, 9, 19, and 74 nm was studied. A method for saturating a wide-pore glass with a dehydrated acid is suggested. This method provides a conductivity on the order of 10⁻⁴–10⁻³ ohm⁻¹ cm⁻¹ in the temperature range 373–473 K.