Thermally-stable high energy-storage performance over a wide temperature range in relaxor-ferroelectric Bi1/2Na1/2TiO3-based ceramics

Abstract

In this study, lead-free zirconium (Zr)-modified Bi-1/2(Na0.78K0.22)(1/2)TiO3 (BNKT) ceramics were synthesized by the conventional solid-state reaction method. The co-existence of two phases (tetragonal; P4mm and cubic phases; Pm (3) over barm) with definite phase fractions were observed for all samples. The lattice parameters were gradually enhanced by the addition of Zr-content in the BNKT ceramics, which strongly support the relaxor-ferroelectric response. All of the samples are well-dense with no noticeable pores detected. Definite grains with clear grain boundaries were observed through SEM analysis. The temperature-dependent (25-200 degrees C) ferroelectric polarization response of all specimens were studied in detail under the constant applied electric field (60 kV cm(-1)). Thermally-stable high energy-storage properties (W-rec approximate to 0.72 J cm(-3), and eta approximate to 98%) with an extended operating temperature range (25-200 degrees C) within +/- 15% variation was observed for the Zr-modified BNKT composition. The enhancement of energy-storage properties can be attributed to the Zr addition, which increased the phase fraction of cubic crystal structure and assisted the ferroelectric to relaxor-ferroelectric phase transition. This study provides a comprehensive analysis of the energy-storage response of the lead-free ceramics for energystorage devices.