Investigation and Confirmation of phase transition of Some SuperionicConductors arepresented throughmagnetic susceptibility (χM) and dielectricConstant( \(\:{K}^{{\prime\:}}\) ) Studies.Uncommon to other ionic solid, Superionic Conductors show great anomaly in theirbehavior in certain temperature range in the \(\:{\chi\:}_{M}\) VsTplots of each solid.Thedistinctivelysharp peak is observed at this temperature inthe \(\:\frac{d{K}^{{\prime\:}}}{dT}\) Vs T plot whichyieldsphase transition temperature.Phase transition temperature of some superionic solids have been already evaluated from electrical conductivity and thermoelectric power experiments and also examined & verified by magnetic susceptibility and dielectric constant studies. The dielectric loss of the superionic solids has been also measured and calculated from electrical conductivity data. The experimental and calculated value of dielectric loss from electrical conductivitydata are nearly same.The magnetic susceptibility ( \(\:{\chi\:}_{M}\) )for observing transition temperature is its better suitability for polycrystalline sample. Measurement of ( \(\:{\chi\:}_{M}\) ) is not depend on size, shape, electrode, grain boundaries of the sample, whereas \(\:{K}^{{\prime\:}}\) has high value and larger change at phase transition temperature.