Colossal permittivity of (Li, Nb) co-doped TiO2 ceramics
Colossal permittivity of (Li, Nb) co-doped TiO2 ceramics
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(Li,Nb)共掺杂TiO2陶瓷的巨介电常数
DOI：
10.1016/j.ceramint.2019.03.080
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发表时间：
2019-06-15
影响因子：
5.2
通讯作者：
Li, Yongxiang
中科院分区：
文献类型：
--
作者：
Li, Wenlong;Liu, Zhifu;Li, Yongxiang
采用固相反应法合成了（Li，Nb）共掺杂的TiO 2陶瓷（LNTOx，x < 0.1）。X射线衍射（XRD）谱表明，所有的LNTO陶瓷具有纯的四方金红石结构。LNTO 0.01陶瓷在10（2）Hz-10（7）Hz的宽频率范围内表现出大于7000的巨介电常数和低介电损耗（tg δ < 0.06）。在不同温度下测试了直流偏压下的介电谱。实验数据能很好地拟合修正的德拜方程。结果表明，LNTO陶瓷中存在多种极化机制，包括空间电荷极化、弛豫型弛豫、极化子跳跃和与局域电子有关的偶极极化。
In this work, (Li, Nb) co-doped TiO2 ceramics (LNTOx, x < 0.1), were synthesized through a conventional solid state reaction method. As revealed by X-ray diffraction (XRD) spectra, all LNTO ceramics exhibited pure tetragonal rutile structure. The LNTO0.01 ceramic showed a colossal permittivity over 7000 and a low dielectric loss (tg delta < 0.06) in a wide frequency range of 10(2) Hz-10(7) Hz. The dielectric spectra under DC biases were tested at different temperatures. The experimental data could fit the modified Debye equation well. It was found that there are multiple dielectric polarization mechanisms in LNTO ceramics including space charge polarization, relaxor-type relaxation, polaron hopping and dipole polarization related with localized electrons.