Abstract
The ferroelectric hysteresis loops of Ba(Ti 0.85Sn 0.15)O 3 and Ba(Ti 0.75Sn 0.25)O 3 solid solution ceramics covering the temperature T m of a dielectric permittivity peak were investigated. At temperatures ∼100 K lower than their respective T m , the two compositions present clear ferroelectricity. Comparing with the parent ferroelectric BaTiO 3, the tiny hysteresis loop of both Ba(Ti 0.85Sn 0.15)O 3 and Ba(Ti 0.75Sn 0.25)O 3 ceramics at temperatures above T m reveals the existence of polar order regions or microdomains. The dielectric properties of the two solid solutions are different: the former shows the character of diffuse ferroelectric phase transition, while the latter displays the feature of relaxor ferroelectrics. According to their ferroelectric properties, however, Ba(Ti 0.85Sn 0.15)O 3 and Ba(Ti 0.75Sn 0.25)O 3 compositions exhibit the diffuse transition from low-temperature ferroelectric domains to polar nanoregions during the ε ( T ) peak area. A difference between the two compositions is that the diffuse transition of the former takes place in a much narrower temperature range than that of the latter.
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