The results of X-ray diffraction, scanning electron microscopy, and dielectric measurements performed for polycrystalline Ba(Ti1-x Zr (x) )O-3 are presented. Data from these measurements show a change of the type of paraelectric-ferroelectric (PE-FE) phase transition (PT) from sharp PT (x < 0.10), through diffuse phase transition (0.10 a parts per thousand currency sign x a parts per thousand currency sign 0.20), to relaxor type one (x = 0.30). The lack of structural PT at the temperature T (m) (the temperature of the maximum of real part of the electric permittivity epsilon') for 0.10 a parts per thousand currency sign x a parts per thousand currency sign 0.30, suggest that this PE-FE transition is not connected with the change of crystal structure. A phase angle of about I broken vertical bar a parts per thousand -90A degrees, between electric current and applied voltage, suggests the occurrence of polar regions (clusters) below 400 K. The change of these clusters polarizability and their lability at the T (m) is postulated as possible origin of the observed maximum of epsilon'.