Introduction of Sr(In0.5Ta0.5)O3 to Modulate Phase Structure and Optoelectronic Properties of (K0.5Na0.5)NbO3 Ceramics

• Published in: Journal of electronic materials 2022-12, Vol.51 (12), p.6913-6920
• Main Authors: Shi, Shaoyang, Hu, Gangbin, Wang, Mingchang, Wu, Huangtao, Liu, Xiang, Wang, Hua, Xu, Jiwen, Yang, Ling, Qiu, Wei
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Dielectric properties; Electric properties; Electrical properties; Electronics and Microelectronics; Ferroelectric materials; Ferroelectricity; Instrumentation; Lead free; Materials Science; Optical and Electronic Materials; Optical properties; Optoelectronics; Original Research Article; Phase transitions; Polyvinyl alcohol; Sintering; Software; Solid phases; Solid State Physics
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-022-09920-0

Pressureless solid-phase sintering was used to prepare (1 −  x )K 0.5 Na 0.5 NbO 3 - x Sr(In 0.5 Ta 0.5 )O 3 (KNN- x SInT, x  = 0.02, 0.03 0.04, 0.05, 0.06, 0.07) ceramics, and effects of SInT doping on the phase structure, microstructure, optical, and electrical properties in ceramics were investigated. With an increase in SInT content, the structure of KNN- x SInT ceramics gradually changes from orthogonal to pseudo-cubic . When x  = 0.04, the near-infrared band (1100 nm) transmittance of the ceramics reaches 46.92%, and the optical band gap ( E g ) is 3.11 eV. The maximum dielectric constant ( ε r ) is 4990 at x  = 0.02, and a maximum d 33 value of 95 pC/N is obtained at x  = 0.03. The KNN- x SInT ceramic sample has characteristics of relaxation ferroelectrics, which is an environmentally friendly, lead-free transparent ferroelectric ceramic.