High temperature x-ray diffraction studies on antiferroelectric and ferroelectric phase transitions in (Pb1−xBax)ZrO3 (x=0.05,0.10)

Abstract

We have carried out high temperature x-ray diffraction studies on (Pb1−xBax)ZrO3(PBZ) to correlate the large thermal hysteresis (∼100 °C for x=0.05) and irreversibility (for x=0.10) of the antiferroelectric (AFE)–ferroelectric (FE) phase transition observed in dielectric measurements with structural changes. It is shown that for both the compositions, the sequence of phase transitions during heating is orthorhombic antiferroelectric (AO) to rhombohedral ferroelectric (FR) and then to cubic paraelectric (PC). The wide phase coexistence region (∼80 °C for x=0.05 and ∼160 °C for x=0.10) and the arrest of the FR to AO transition for x=0.10 during cooling strongly indicate first order character of the AO–FR transition. It is shown that the transformation strains associated with the AO to FR transition increases with Ba2+ concentration from a value of 0.6% for x=0 to 0.9% for 0.10. Similarities of the AO–FR transition in PBZ with nonthermoelastic martensitic transformations are pointed out. The FR to PC transition is also shown to be first order but with a small thermal hysteresis (∼10 °C) and a small discontinuous change in the cell volume (∼0.5%).

Refining the phase diagram of Pb1−xLax(Zr0.9Ti0.1)1−x/4O3 ceramics by structural, dielectric, and anelastic spectroscopy investigations

“…Following the same procedure, 31 we have observed that the ratio of the intensities of (004) O and (240) We have further plotted the peak intensities ratio (004)/ (240) O extracted from these graphs as a function of x in Fig. 3(b).…”

Preparation and properties of La doped PZT 90/10 ceramics across the ferroelectric–antiferroelectric phase boundary

“…Hence, for studying the phases coexistence region at the FEeAFE border, we have concentrated on the influence of La 3þ addition on intensities evolution of (10 0) and (111) reflections [25]. The (10 0) reflection appears as a singlet and well split doublet in the XRD patterns for the FE and AFE phases, respectively.…”

Effect of Excess Lead Oxide on Phase Transitions and Physical Properties of Provskite Lead Barium Zirconate Ceramics

“…In PBZ, the AFE and FE phases were characterized as orthorhombic and rhombohedral structure, respectively. It is reported that the AFE→FE phase transition produces a large increase in volume [5]. Furthermore, the electric-field required to induce AFE→FE switching is much lower than for PbZrO 3 (PZ) which has created interest in PBZ for potential use in large displacement actuator devices requiring low switching voltages [8].…”

“…Later on, many authors have investigated the properties of PBZ, especially its phase transitions [1][2][3][4][5][6][7]. Shirane [3] was one of who first demonstrated the antiferroelectric to ferroelectric (AFE→FE) phase transition in PBZ solid solution compositions with x ≥ 0.05.…”

“…The (Pb 0.90 Ba 0.10 )ZrO 3 ceramics were prepared via the conventional mixed oxide method. Excess PbO (1,3,5, and 10wt%) was introduced prior to powder calcination. The phase formation and phase transition of (Pb 0.90 Ba 0.10 )ZrO 3 ceramics were characterized by X-ray diffraction and thermal analysis.…”