Effects of the Lanthanum Concentration on the (Pb1-xLax)(Zr0:95Ti0:05)1-x/4O3 Antiferroelectric Ceramic System
Lanthanum modified lead zirconate titanate antiferroelectric ceramics has been studied by using X-ray diffraction, dielectric analysis and ferroelectric hysteresis loops. Both antiferroelectric-orthorhombic (Pbam) and ferroelectric-rhombohedral (R3c) phases co-exist in the studied compositions. The dielectric response has revealed the presence of two peaks in a wide temperature range, which have been associated to different phase transitions. Slim-like hysteresis loops were obtained at room temperature, suggesting a higher stability of the antiferroelectric phase. The hysteresis and dielectric results show that the increase of the La3+ ions concentrations disrupts the long-range dipolar order
for the ferroelectric phase.
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