Li Zeping, Zhou Huajian, Xiong Gang, Wang Huifeng, Wang Geng
School of Electronic and Information Engineering, Hubei University of Science and Technology, Xianning 437100, China.
Key Laboratory of Photoelectric Sensing and Intelligent Control, Hubei University of Science and Technology, Xianning 437100, China.
Materials (Basel). 2024 Jul 13;17(14):3477. doi: 10.3390/ma17143477.
High-k BaSmTiO ceramics with improved microwave dielectric characteristics were successfully fabricated using the one-step reaction sintering (RS) route. The sintering characteristics, microstructure, crystal structure, infrared reflection spectrum, and microwave dielectric characteristics of BaSmTiO ceramics prepared by the RS route were systematically investigated. Samples prepared by the RS route exhibited single-phase orthorhombic tungsten-bronze structure and dense microstructure at optimum sintering temperature. Compared with the conventional solid-state (CS) process, the BaSmTiO ceramics fabricated by the RS route presented a smaller temperature coefficient (TCF), a higher quality factor (), and a higher permittivity (). The improved microwave dielectric characteristics were highly dependent on the theoretical permittivity, atomic packing fraction, suppression of Ti, and Ti-site bond valence. Excellent combined microwave dielectric characteristics (TCF = -7.9 ppm/°C, = 9519 GHz, = 80.26) were achieved for BaSmTiO ceramics prepared by RS route sintered at 1400 °C, suggesting the RS route was a straightforward, economical and effective route to prepare high-performance BaSmTiO ceramics with promising application potential.
采用一步反应烧结（RS）法成功制备了具有改善的微波介电特性的高介电常数BaSmTiO陶瓷。系统研究了通过RS法制备的BaSmTiO陶瓷的烧结特性、微观结构、晶体结构、红外反射光谱和微波介电特性。通过RS法制备的样品在最佳烧结温度下呈现单相正交钨青铜结构和致密的微观结构。与传统固态（CS）工艺相比，通过RS法制备的BaSmTiO陶瓷具有更小的温度系数（TCF）、更高的品质因数（）和更高的介电常数（）。改善的微波介电特性高度依赖于理论介电常数、原子堆积分数、Ti的抑制以及Ti位键价。对于在1400℃烧结的通过RS法制备的BaSmTiO陶瓷，实现了优异的综合微波介电特性（TCF = -7.9 ppm/°C， = 9519 GHz， = 80.26），表明RS法是制备具有广阔应用潜力的高性能BaSmTiO陶瓷的一种直接、经济且有效的方法。
