Abstract
The dielectric functions and phase transitions of MgO modified Pb0.99(Zr0.95Ti0.05)0.98Nb0.02O3 (PZTN-x wt% MgO, x = 0, 0.1, 0.2, 0.5) ceramics have been investigated using temperature-dependent spectroscopic ellipsometry. With the aid of standard critical-point (SCP) model, four typical interband transitions can be observed from the second derivative of dielectric functions. Three transition process are observed and can be linked to antiferroelectric (AFE)-ferroelectric (FE) (T1 ∼ 250 K), low temperature ferroelectric phase [FER(LT)]to high temperature one [FER(HT)] (T2 ∼ 300 K), and ferroelectric-paraelectric phase (TC ∼ 500 K).
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