Electrical and Optical Property of Lanthanum Oxide Doped Potassium Sodium Niobate Ceramics

doi:10.15541/jim20210297

Abstract

Abstract:

Potassium sodium niobate (K_0.5Na_0.5NbO₃, KNN) based ceramics can be widely used for pulsed power systems due to their fast charge-discharge rate, high transparency, wide range of working temperature, and long cycle life. Improving the electrical and optical property of KNN-based ceramics through modification is a research hotspot in this field. 0.825(K_0.5Na_0.5)NbO₃-0.175Sr_1-3_x_/2La_x(Sc_0.5Nb_0.5)O₃(x=0, 0.1, 0.2, 0.3) (0.825KNN- 0.175SLSN) ceramics were synthesized by solid state method. The effect of La₂O₃ doping on the phase structure, microstructure, optical property, dielectric property, ferroelectric property and energy storage property of the ceramic was studied. The results indicated that the structure of 0.825KNN-0.175SLSN ceramics is pseudo-cubic phase with high symmetry. With increment of La₂O₃content, the average grain size of 0.825KNN-0.175SLSN ceramics decreased, and the phase transition temperature (T_m) and saturation polarization intensity (P_max) increased and then decreased. 0.825KNN-0.175SLSN ceramics exhibit excellent transparency at x=0.3, the transmittance in the visible wavelength (780 nm) and near-infrared wavelength (1200 nm) ranges reaches 65.2% and 71.5%, respectively. The dielectric breakdown strength of 310 kV/cm and a recoverable energy density of 1.85 J/cm ³ are achieved at x=0.3.

Key words: potassium sodium niobate, lead-free transparent ceramics, transmittance, energy storage property

CLC Number:

TQ174

XIAO Shulin, DAI Zhonghua, LI Dingyan, ZHANG Fanbo, YANG Lihong, REN Xiaobing. Electrical and Optical Property of Lanthanum Oxide Doped Potassium Sodium Niobate Ceramics[J]. Journal of Inorganic Materials, 2022, 37(5): 520-526.

Figures/Tables 8

Fig. 1 Variation of density for the 0.825KNN-0.175SLSN ceramics with different content of La

Fig. 2 XRD patterns of the 0.825KNN-0.175SLSN ceramics at room temperature

Fig. 3 SEM micrographs of the original surfaces of 0.825KNN-0.175SLSN (a) x=0; (b) x=0.1; (c) x=0.2; (d) x=0.3

Fig. 4 Transmission spectra (a) of 0.825KNN-0.175SLSN ceramic, with inset showing photographs of the 0.3 mm specimens, and plots (b) of (αhν)2 and hν of the 0.825KNN-0.175SLSN ceramic with x=0.3

Fig. 5 Temperature dependence of the dielectric properties (a-d), Tm and εm (e) of 0.825KNN-0.175SLSN ceramics

Fig. 6 P-E loops of 0.825KNN-0.175SLSN ceramics at selected applied electric fields Colorful figures are available on website

Fig. 7 Pmax and Pr of 0.825KNN-0.175SLSN ceramics as a function of x

Fig. 8 Unipolar P-E hysteresis loops (a-d) of 0.825KNN-0.175SLSN ceramics under different electric fields, variation (e) of W and Wrec, for the 0.825KNN-0.175SLSN ceramics with different x, and variation (f) of η and Eb for the 0.825KNN-0.175SLSN ceramics with different x

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