Published in
Elsevier, Solid State Communications, 10-11(144), p. 425-428
DOI: 10.1016/j.ssc.2007.09.030
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Features of phase transitions in lanthanum-modified lead zirconate titanate ferroelectric ceramics
,
F. Calderón Piñar,
O. García Zaldívar,
R. López Noda,
J. de los Santos Guerra,
J. Antonio Eiras,
J. Antonio Eiras
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Abstract
The dielectric behavior and the ferroelectric properties (hysteresis loops) of Pb0.94La0.06(Zr0.80Ti0.20)0.985O3 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.