High dielectric permittivity and ultralow dielectric loss in Nb-doped SrTiO3 ceramics

作者：Luo, Lichen; Li, Jinglei^*; Wang, Mingwen; Yang, Shuai; Wu, Jie; Gao, Xiangyu; Li, Chunchun; Du, Wenya; Zhang, Lin; Li, Fei

来源：Ceramics International, 2022, 48(19): 28438-28443.

DOI：10.1016/j.ceramint.2022.06.157

• High dielectric permittivity
• Low dielectric loss
• Nb-doped SrTiO 3

In this study, we prepared a series of Nb-doped SrTiO3 ceramics sintered in both air and N-2 atmospheres. The X-ray diffraction (XRD) analysis indicated that all samples had a pure cubic phase perovskite structure with no secondary phase. The dielectric test showed that the Nb-doped SrTiO3 ceramics had a high dielectric permittivity (> 3 x 10(4)) and low dielectric loss (< 0.004) over a broad temperature range from-100 to 300 ?C with a breakdown strength over 20 kV/cm. The dielectric performance is attributed to the designated Ti '(Ti)- V-O(..)- Ti-Ti ' deep-lattice-defect states localising weak-hopping electrons to generate high defect-dipole concentrations, as verified by systematic X-ray photoelectron spectroscopy (XPS) experiments. This study offers a route for designing other types of high dielectric permittivity ceramics.

• 单位
  西安交通大学; 桂林理工大学