Study on the dielectric properties of Mg-doped NaBiTi6O14 ceramics  

作　　者：陈勇 薛思敏 骆迁 苏虎音 陈琪 黄镇 徐玲芳 曹万强 黄兆祥 

机构地区：[1]School of Physics and Electronic Science,Key Laboratory ofFerro&Piezoelectric Materials and Devices of Hubei Province,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials,Hubei University,Wuhan 430062,China [2]School of Materials Science and Engineering,Hubei University,Wuhan 430062,China [3]Department of Information Science and Technology,WenHua College,Wuhan 430074,China

出　　处：《Chinese Physics B》2017年第4期462-467,共6页中国物理B（英文版）

基　　金：Project supported by the Fund from the Hubei Provincial Department of Education,China(Grant No.D20161006)

摘　　要：With the interest in using lead-free materials to replace lead-containing materials increasing,the use of Na_（0.5）Bi_（0.5）TiO_3（NBT） has come into our sight.We studied the composition of NBT and found that NaBiTi_6O_（14） ceramics can be compositionally tuned by Mg-doping on the Ti-site to optimize the dielectric properties.In this study,Mg-doped NaBiTi_6O_（14）（NaBi（Ti_（0.98）Mg_（0.02））_60_（14-d）） ceramics were prepared by a conventional mixed oxide route at different sintering temperatures,and their dielectric properties have been studied at a wide temperature range.X-ray diffraction（XRD） patterns of the NBT-based ceramics indicate that all samples have a pure phase without any secondary impurity phase.The experimental data show that after Mg-doping,the relative permittivity and dielectric loss become lower at 1040,1060,and1080 ℃ except 1020 ℃ and at different frequencies from 10 kHz,100 kHz to 1 MHz.Take 1060 ℃ for example,when the sintering temperature is 1060 ℃ at 1 MHz,the minimum relative permittivity of NaBiTi_6O_（14） is 32.9 and the minimum dielectric loss is 0.01417,the relative permittivity of NaBi（Ti_（0.98）Mg_（0.02））_60_（14-δ） under the same condition is 25.8 and the dielectric loss is 0.000104.We explored the mechanism of Mg-doping and surprisingly found that the dielectric property of NaBi（Ti_（0.98）Mg_（0.02））_60_（14-δ） becomes better owing to Mg-doping.Thus,NaBi（Ti_（0.98）Mg_（0.02））_60_（14-δ） can be used in microwave ceramics and applied to new energy materials.With the interest in using lead-free materials to replace lead-containing materials increasing,the use of Na_（0.5）Bi_（0.5）TiO_3（NBT） has come into our sight.We studied the composition of NBT and found that NaBiTi_6O_（14） ceramics can be compositionally tuned by Mg-doping on the Ti-site to optimize the dielectric properties.In this study,Mg-doped NaBiTi_6O_（14）（NaBi（Ti_（0.98）Mg_（0.02））_60_（14-d）） ceramics were prepared by a conventional mixed oxide route at different sintering temperatures,and their dielectric properties have been studied at a wide temperature range.X-ray diffraction（XRD） patterns of the NBT-based ceramics indicate that all samples have a pure phase without any secondary impurity phase.The experimental data show that after Mg-doping,the relative permittivity and dielectric loss become lower at 1040,1060,and1080 ℃ except 1020 ℃ and at different frequencies from 10 kHz,100 kHz to 1 MHz.Take 1060 ℃ for example,when the sintering temperature is 1060 ℃ at 1 MHz,the minimum relative permittivity of NaBiTi_6O_（14） is 32.9 and the minimum dielectric loss is 0.01417,the relative permittivity of NaBi（Ti_（0.98）Mg_（0.02））_60_（14-δ） under the same condition is 25.8 and the dielectric loss is 0.000104.We explored the mechanism of Mg-doping and surprisingly found that the dielectric property of NaBi（Ti_（0.98）Mg_（0.02））_60_（14-δ） becomes better owing to Mg-doping.Thus,NaBi（Ti_（0.98）Mg_（0.02））_60_（14-δ） can be used in microwave ceramics and applied to new energy materials.

关 键 词：NaBiTi6O14 PERMITTIVITY loss（tanδ） dielectric ceramics 

分 类 号：TQ174.1[化学工程—陶瓷工业] TN304.054[化学工程—硅酸盐工业]