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Abstract
The effect of the titanium cation as a doping element in the diffuse phase transition of the (Sr0.255La0.03Ba0.7)(Nb2-yTiy)O6-y/2 ferroelectric ceramic system is studied. Far from the transition temperature, a Curie-Weiss behavior of the dielectric permittivity with temperature is observed with strongly broadened curves in all cases, however, a non Curie-Weiss behavior above the transition temperature is observed. The diffuseness coefficient (δdL) was calculated using Isupov's relation and by a more realistic model assuming a Gaussian distribution for the transition temperatures, in a temperature interval around the maximum permittivity temperature. The conditions under which each expression can be used are discussed.