Abstract
The dielectric behavior and the ferroelectric properties (hysteresis loops) of Pb 0.94La 0.06(Zr 0.80Ti 0.20) 0.985O 3 ferroelectric ceramics are analyzed considering the coexistence of the ferroelectric (FE) and the antiferroelectric (AFE) phases. The x-ray diffraction patterns and polarized light microscopy results reveal that FE and AFE ordering coexist. The dielectric analysis suggests two phase transitions. The first around 75 ∘C, which is associatted to a ferroelectric (rhombohedral)–antiferroelectric (orthorhombic) phase transition; the second around 120 ∘C, associated with an antiferroelectric (orthorhombic)–paraelectric (cubic) phase transition. The temperature dependence of hysteresis loops shows a double-loop-like behavior for temperatures above 75 ∘C, showing a typical characteristic of an induced ferroelectric-antiferroelectric transformation.
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