Abstract
Perovskite ferroelectic oxides with simultaneous highly thermal stable dielectric property and piezoelectric response are promising candidate for advanced energy, dielectric, and smart devices. The (1-x)[0.98[(K0.5Na0.5)NbO3]-0.02(BaNi0.5Nb0.5O3)]-xLiNbO3 (abbreviated as (1-x)KNBNNO-xLiNbO3; x = 0.00, 0.02, 0.04, 0.06, 0.08) lead-free multifunction ferroelectric ceramic is synthesized by solid-state reaction method. XRD analysis reveals that the samples exhibit perovskite structure with 0≤x≤0.06, and the second phase K3Li2Nb5O15 appears at x=0.08. The scanning electron microscopy image show that the grain size of ceramics increases from 0.65 μm to 3.58 μm with LiNbO3 content increasing. Meanwhile, the Curie temperature (TC) shifts to a higher temperature (~ 427 °C for x=0.06). A high dielectric thermal stability of ∆e/e40°C ≤ ±10%, with a high dielectric permittivity (~1400), is achieved at x = 0.06 over a wide temperature range of ~40–348 °C with d33 of ~160 pC·N−1, and a remnant polarization (Pr) of 20.5 μC·cm−2. This work shows that this multifunction material could be applied in sensor to efficiently covert both solar and kinetic energies into electricity over a wide temperature range.
Highlights
Perovskite oxides, with the ABO3 topological structure, have been recognized as the smart platform for the generation advanced multifunctional energy conversion and/or storage devices (Bai et al, 2017, 2019; Hao et al, 2019)
The results show that both piezoelectricity and thermal stability of KNBNNO-LiNbO3 system can be enhanced simultaneously
Pure perovskite structure is formed at 0 ≤ x ≤ 0.06, and the original diffraction peak moves toward lower angles upon the increasing of x
Summary
Perovskite oxides, with the ABO3 topological structure, have been recognized as the smart platform for the generation advanced multifunctional energy conversion and/or storage devices (Bai et al, 2017, 2019; Hao et al, 2019). The emerging of (K0.5Na0.5)NbO3 (KNN)based lead-free system would be a remarkable alternative for these drawbacks due to its high-performance piezoelectric, ferroelectric properties, and high curie temperature (Du et al., 2007b; Ding et al, 2018; Zhao et al, 2019). According to the structure-activity relationship, chemical modification is an effective method to enhance the temperature stability and piezoelectric properties of KNN-based ceramics, including the formation of solid solutions with other compounds, such as. Few studies have focus to the thermal stability of KNN-based functional ceramics, which is the pivotal parameter for practical device working. It is of great interest to design KNN-based multifunction materials with both improved piezoelectricity properties and favored temperature stability. This work would promote the development of lead-free multifunctional ferroelectrics over a broad temperature range
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
