Influence of (Mg_1/3Nb_2/3) complex substitutions on crystal structures and microwave dielectric properties of Li₂TiO₃ ceramics with extreme low loss(PDF)

Journal of Materiomics[ISSN:/CN:]

volumne:

Issue:

2018年04期

Page:

368-382

Research Field:

Publishing date:

2018-11-22

Info

Title:

Influence of (Mg_1/3Nb_2/3) complex substitutions on crystal structures and microwave dielectric properties of Li₂TiO₃ ceramics with extreme low loss

Highlights:

Huan-Huan Guo^a; Di Zhou^a; Li-Xia Pang^b; Jin-Zhan Su^c

^aElectronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, 710049, China;^bMicro-optoelectronic Systems Laboratories, Xi'an Technological University, Xi'an, 710032, Shaanxi, China;^cInternational Research Centre for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China

Keywords:

Microwave dielectric properties; Phase evolution; Crystal structure; High quality

PACS:

-

DOI:

https://doi.org/10.1016/j.jmat.2018.09.002

Abstract:

A systematic investigation of the Li₂Ti_1-x(Mg_1/3Nb_2/3)_xO₃ (0.1?≤?x?≤?0.35) solid solutions synthesized by traditional solid-state reaction method is reported in this work. In the composition range of 0.1?≤?x?≤?0.25, a monoclinic rock salt structured solid solution was formed. When x increased to 0.3, a phase transition from monoclinic to cubic phase, along with an order-disorder phase transition, was observed. With x increased from 0.1 to 0.35, the microwave permittivity (ε_r) and temperature coefficient of resonant frequency (TCF) of the Li₂Ti_1-x(Mg_1/3Nb_2/3)_xO₃ ceramics decreased linearly from 21.0 to 18.6, +27.1 to ?19.4 ppm/°C, respectively. The Li₂Ti_0.75(Mg_1/3Nb_2/3)_0.25O₃ ceramic sintered at 1170?°C shows high performance of microwave dielectric properties with a ε_r ?19.6, a Qf (Q = quality factor = 1/dielectric loss; f = resonant frequency) ?109,770 GHz (at 7.7 GHz) and a near zero TCF ? + 1.2 ppm/^oC. Moreover, the burying sintering process can reduce the volatilization of lithium so that the porosity of Li₂Ti_0.75(Mg_1/3Nb_2/3)_0.25O₃ ceramic was reduced effectively, which made Li₂Ti_0.75(Mg_1/3Nb_2/3)_0.25O₃ ceramic promising for future applications. Selected area electron diffraction patterns, high-resolution transmission electron microscopy, Raman and far-infrared spectra were employed to study the relation between crystal structure and microwave dielectric properties in detail.

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