The luminescence modulation behaviour under the in-situ electric field of rare-earth doped KSr_(2)Nb_(5)O_(15) ceramics opened a new door for the development of dielectric materials.Where the understanding the effect ...The luminescence modulation behaviour under the in-situ electric field of rare-earth doped KSr_(2)Nb_(5)O_(15) 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,Nd^(3+)-doped KSr_(2)Nb_(5)O_(15)(KSN-xNd)ceramics were synthesized,and the electric properties were investigated systematically.Our results suggest that the Nd^(3+) doping slightly increased the phase transition temperatures and improved the piezoelectric response of KSr_(2)Nb_(5)O_(15).Most importantly,a bidirectional dielectric tunability is revealed in KSr_(2)Nb_(5)O_(15).The dielectric permittivity can be adjusted by the DC electric bias,with tunability ranging from12.3% 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.展开更多
基金This work was supported by the China-Poland International Collaboration Fund of National Natural Science Foundation of China(No.51961135301)National Natural Science Foundation of China(No.51702259)+2 种基金the National Key R&D Foundation of the Ministry of Science and Technology(No.2018YFB1107405)the Basic Research Program of Shenzhen(No.JCYJ20170306155944271)the Fundamental Research Funds for the Central Universities(No.06450-G2019KY0601,3102019MS0406).
文摘The luminescence modulation behaviour under the in-situ electric field of rare-earth doped KSr_(2)Nb_(5)O_(15) 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,Nd^(3+)-doped KSr_(2)Nb_(5)O_(15)(KSN-xNd)ceramics were synthesized,and the electric properties were investigated systematically.Our results suggest that the Nd^(3+) doping slightly increased the phase transition temperatures and improved the piezoelectric response of KSr_(2)Nb_(5)O_(15).Most importantly,a bidirectional dielectric tunability is revealed in KSr_(2)Nb_(5)O_(15).The dielectric permittivity can be adjusted by the DC electric bias,with tunability ranging from12.3% 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.
