The indirect synthesized method induced relaxor state to ferroelectric characteristics for Pb0.95La0.05(Fe2/3W1/3)0.65Ti0.35O3 ceramics

Pb0.95La0.05(Fe2/3W1/3)0.65Ti0.35O3 ceramics are synthesized by using the conventional direct oxide synthesized (DS) method and the indirect synthesized (IS) method. The low-field dielectric response is investigated by using the empirical law, two ordering models and the space charge polarization. The temperature-dependent dielectric peak of the samples prepared using the IS synthesized method is obviously increased; the temperature-dielectric constant is changed to sharp and the diffused phase characteristic is decreased. It is concluded that the IS synthesized method can change the dielectric natures from a relaxor like behavior to a sharp ferroelectric state. The space charge polarization is also changed by using the IS synthesized method. According to these results, it is suggested that the 1:1 ordered domain is enhanced based on the random-site type by using the IS synthesized method for Pb0.95La0.05(Fe2/3W1/3)0.65Ti0.35O3 ceramics. However, if the sintering temperature is not high enough for some calcined powders, the random-site type can be changed to the space charge type.