Raman spectroscopy investigation on (Pb1-xLax)(Zr0.90Ti0.10)(1-x/4)O-3 ceramic system
Résumé
A Raman spectroscopy study at room temperature was carried out on (Pb1-xLax)(Zr0.90Ti0.10)(1-x/4)O-3 ceramics (x = 2, 3, 4 at%). The results were analyzed considering the x-ray patterns at room temperature showing a mixture of two phases: a rombohedral-ferroelectric phase and an orthorhombic-antiferroelectric, increasing the% of the second one with the lanthanum concentration. For x = 3 at%, the analysis was also carried out in a wide temperature range. Two anomalies were evaluated, one around 363 K, which has been associated to a ferroelectric-antiferroelectric phase transition; the second one around 430 K, which has been associated to a transition from an incommensurable state to a ferroelectric phase. (C) 2016 Elsevier B.V. All rights reserved.