@article{Cai2023, 
author = {Jinghan Cai and Junlei Qi and Yueyang Yang and Xinyue Zhang and Yuan-Hua Lin},
title = {Colossal permittivity and ultralow dielectric loss in Nb-doped SrTiO3 ceramics},
year = {2023},
journal = {Journal of Advanced Ceramics},
volume = {12},
number = {12},
pages = {2247-2256},
keywords = {SrTiO3, defect dipoles, ultralow dielectric loss, colossal permittivity (CP)},
url = {https://www.sciopen.com/article/10.26599/JAC.2023.9220815},
doi = {10.26599/JAC.2023.9220815},
abstract = {Defect engineering has been applied to prepare materials with modifiable dielectric properties. SrTiNbxO3 (x = 0, 0.003, 0.006, 0.009, 0.012) ceramics were synthesized using the traditional solid-state reaction method and sintered in a reducing atmosphere. All samples show excellent dielectric properties with giant permittivity (> 3.5×104) and low dielectric loss (< 0.01). SrTiNb0.003O3 ceramic exhibits a colossal permittivity of 4.6×104 and an ultralow dielectric loss of 0.005 (1 kHz, room temperature) as well as great temperature stability in the range of (−60)–160℃. The mechanism of the presented colossal permittivity (CP) properties is investigated by conducting X-ray photoelectron spectroscopy (XPS) and analyzing activation energies. The results indicate that the introduction of Nb5+ and the reducing sintering atmosphere together generated the formation of Ti3+ and  VO··. These defects further form  TiTi′−VO··−TiTi′ defect dipoles, contributing to the coexisting giant permittivity and low dielectric loss in Nb-doped SrTiO3 (STN) ceramics.}
}