Phase transitions in PbZr_xHf_1-xO3 determined by thermal analysis and impedance spectroscopy

Abstract

The objective of this study is to determine the influence of partial substitutions of Zr by Hf in the perovskitetype crystalline structure of PbZrO(3). Different samples over the whole composition range (0 < or = x < or = 1) in the PbZr(x)Hf(1-x)O(3) family have been prepared. Phase transitions have been determined by thermal analysis (DSC) and complex impedance (IS) spectroscopy over a wide temperature range. As a consequence of the cation replacement, the changes that take place in the different phase transitions temperatures are reported. By both techniques, thermal analysis and electrical characterization, it is shown that for all compositions prepared there are 2 phase transitions in a temperature range between 160 and 230 degrees C. With these results and the previously known crystalline structure of pure PbZrO(3) and PbHfO(3) perovskites, the phase diagram of the PbZr(x)Hf(1-x) O(3) family is presented for the first time.

Thermal analysis of phase transitions in perovskite electroceramics

“…Thermal analysis techniques were used to characterize various phase transitions and other properties in lead-containing and lead-free antiferroelectric and ferroelectric perovskites [20][21][22][23][24][25][26][27][28].…”

Electrical properties of antiferroelectric Pb(Zr,Hf)O3 films fabricated by chemical solution deposition

“…Based on the abovementioned research, it can be expected that Pb(Zr,Hf)O 3 (PZH) achieves an excellent energy-storage performance. Rubia et al 27) studied the phase transition of the PZH ceramics and predicted that the competition of Zr 4+ and Hf 4+ would not change the crystal structure but affect the electrical behavior of the AFE phase. However, more research on the microstructure, electrical properties and energy-storage performance of PZH is still required.…”