These transitions have been detected by differential scanning calorimetry, impedance and modulus spectroscopy techniques. The first transition at T=395 K is related to NH,(+)(4) reorientation and H+ diffusion. The conductivity relaxation parameters associated with some K+/NH4+: and H+ conduction have been determined from an analysis of the M"/M" max spectra measured in a wide temperature range. Transport properties in this material appear to be due to an K+ /NH4+: and H+ ions hopping mechanism.