Effects of Mn2+ doping on the microwave dielectric properties of Ti1-xCux/3Nb2x/3O2 ceramics
Effects of Mn2+ doping on the microwave dielectric properties of Ti1-xCux/3Nb2x/3O2 ceramics
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Mn2+掺杂对Ti1-xCux/3Nb2x/3O2陶瓷微波介电性能的影响
DOI：
10.1016/j.ceramint.2017.07.115
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发表时间：
2017
影响因子：
5.2
通讯作者：
Li Yongxiang
中科院分区：
文献类型：
--
作者：
Shao Hui;Liu Zhifu;Jian Guang;Ma Mingsheng;Li Yongxiang
在这项研究中，未掺杂和Mn2+掺杂的Ti1 − xCux/3Nb2x/3O2（TCN，x = 0.2，0.25，0.3，0.35）陶瓷使用固态反应法制备。利用X射线衍射仪（XRD）、扫描电镜（SEM）和透射电镜（TEM）研究了TCN陶瓷的相组成和显微结构。结果表明，随着Cu和Nb含量的增加，TCN陶瓷的密度和介电常数均增加。而未掺杂TCN陶瓷的Q × f值随烧结温度的升高而降低。少量Mn~（2+）掺杂对介电常数没有影响，但提高了Q × f值。X射线光电子能谱（XPS）分析表明，Mn2+掺杂抑制了烧结过程中Cu2+向Cu+的转变，抑制了氧空位的形成，从而提高了Q × f值。在1025 ° C下烧结5h，Mn~（2+）掺杂量为0.6at%（x = 0.25）的TCN陶瓷的介电常数为95，Q × f值为20800GHz（@3.50GHz），具有优异的微波介电性能。
In this study, undoped and Mn2+doped Ti1−xCux/3Nb2x/3O2(TCN, x = 0.2, 0.25, 0.3, 0.35) ceramics were prepared using a solid-state reaction method. The phase composition and microstructure of the TCN ceramics were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicated that the density and permittivity of the TCN ceramics increase with the increasing of the Cu and Nb content. However, Q × f value of the undoped TCN ceramics decreases with an increase in the sintering temperature. A small amount of Mn2+doping has no effect on the permittivity, but improves the Q × f value. X-ray photoelectron spectroscopy (XPS) analysis indicated that the transition of Cu2+to Cu+during the sintering process could be inhibited by Mn2+doping, which suppresses the formation of oxygen vacancies, as a result, the improvement of Q × f value. Excellent microwave dielectric properties with a permittivity of 95 and Q × f value of 20800 GHz (@3.50 GHz) were achieved from the 0.6 at% Mn2+doped TCN (x = 0.25) ceramics sintered at 1025 °C for 5 h.