@article{Cao2021, 
author = {Shuyao Cao and Jie Xu and Li Jin and Jia Zhao and Zhida Ma and Qian Chen and Junting Liu and Feng Gao},
title = {Microstructure and bidirectional dielectric tunability behaviour of Nd3+-doped KSr2Nb5O15 lead-free ceramics},
year = {2021},
journal = {Journal of Materiomics},
volume = {7},
number = {5},
pages = {976-987},
keywords = {Tungsten bronze type structure, KSr2Nb5O15, Nd3+ doping, Bidirectional dielectric tunability},
url = {https://www.sciopen.com/article/10.1016/j.jmat.2021.02.016},
doi = {10.1016/j.jmat.2021.02.016},
abstract = {The luminescence modulation behaviour under the in-situ electric field of rare-earth doped KSr2Nb5O15 ceramics opened a new door for the development of dielectric materials. Where the understanding the effect of rare-earth doping on the electric properties of host, especially at the similar doping concentration with luminescence researches (low concentrations) is very important for the exploration of mechanism of electric-luminescent coupling effect. In this work, Nd3+-doped KSr2Nb5O15 (KSN-xNd) ceramics were synthesized, and the electric properties were investigated systematically. Our results suggest that the Nd3+ doping slightly increased the phase transition temperatures and improved the piezoelectric response of KSr2Nb5O15. Most importantly, a bidirectional dielectric tunability is revealed in KSr2Nb5O15. The dielectric permittivity can be adjusted by the DC electric bias, with tunability ranging from −12.3% to 21.9%. The related mechanism and relationship between the bidirectional dielectric tunability and ferroelectricity are revealed by temperature-dependent dielectric and ferroelectric characterization. The researches of electric properties and bidirectional dielectric tunability of KSN-based ceramics paved the way to further exploration of electric-luminescent coupling mechanism.}
}