The conductivity of tetra-alkylammonium halide hydrates has been studi
ed by impedance spectroscopy in the temperature range 213-322 K. Condu
ctivity drops around their melting point and in some cases again about
20 K below it. At 250 K it is in the range 10(-6)-10(-9) Sm-1 Linear,
Arrhenius type conductivity dependence is observed for lower temperat
ures and corresponding activation energies of conductivity are within
0.45-0.62 eV. At a given temperature the conductivity of retra-alkylam
monium halide hydrates is a few orders of magnitude lower than that of
tetramethylammonium hydroxide hydrates. The reasons for this differen
ce are discussed.