首页|Changing the crystal phase structure and dielectric properties of Sr4?xBaxSmFe0.5Nb9.5O30 ceramics by adjusting the vacancy
Changing the crystal phase structure and dielectric properties of Sr4?xBaxSmFe0.5Nb9.5O30 ceramics by adjusting the vacancy
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NSTL
Elsevier
? 2022 Elsevier B.V.In this paper, a new type of lead-free ceramic of Sr4?xBaxSmFe0.5Nb9.5O30 (x = 0, 0.25, 0.5, 0.75 and 1, abbreviated as SBSFN) was prepared by high-temperature solid-phase synthesis. With the increase of x, the packing fraction in the unit cell increases, the vacancy decreases, and the orthogonal phase transforms into the tetragonal phase. The XRD and refinement results show the distortion in the BO6 octahedron variety as the vacancy decreases. When x increases from 0.5 to 1, and the peak value of the dielectric constant (εr) increases from 215 to 665 (10 kHz). With the fluctuation of the composition, the relaxation phenomenon is obvious. The impedance data show that there are crystal grains and grain boundaries at high temperature, and all samples undergo a relaxation thermal activation process. The breakdown field strength and remnant polarization of the ceramics increase with increasing x, which indicates that the ferroelectric properties of these ceramics improve.
Guangxi Universities Key Laboratory of Nonferrous Metal Oxide Electronic Functional Materials and Devices Guangxi Key Laboratory of Optical and Electronic Materials and Devices Key Laboratory of New Processing Technology for Nonferrous Metals and Material
NSTL
Elsevier
