Crystal structure and microwave dielectric properties of a novel rock-salt type Li 3 MgNbO 5 ceramic
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Crystal structure and microwave dielectric properties of a novel rock-salt type Li3MgNbO5 ceramic Jie Li1,*, Zhiwei Zhang1,2, Yunfei Tian1, Laiyuan Ao3, Junqi Chen1, Aihong Yang1, Congxue Su1, Laijun Liu1, Ying Tang1,2,*, and Liang Fang1,2,3,* 1
Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China 2 Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin 541004, People’s Republic of China 3 College of Materials and Chemical Engineering, China Three Gorges University, Yichang 443002, China
Received: 13 May 2020
ABSTRACT
Accepted: 19 August 2020
A new rock-salt type compound, namely Li3MgNbO5, was synthesized using traditional two-step sintering process for the first time. The products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermal dilatometer and network analyzer. The Li3MgNbO5 ceramic sintered at 1260 °C adopted a cubic structure with Fm-3 m space group and exhibited excellent microwave dielectric properties (MDPs) of er = 16.2, Q 9 f = 96796 GHz, and TCF = - 24.8 ppm/°C. The fitting results of the infrared spectrum indicated that the dielectric polarization of Li3MgNbO5 in microwave frequency band was contributed by phonon absorption in infrared band. Furthermore, the negative TCF value of Li3MgNbO5 ceramic was compensated with a traditional TCF compensator * CaTiO3. A near-zero TCF value of ? 1.2 ppm/°C was achieved in the composite 0.96Li3MgNbO5–0.04CaTiO3 ceramics with er = 18.4 and high Q 9 f = 86625 GHz, exhibiting a great potential to be applied in microelectronics systems.
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Springer Science+Business
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Introduction Dielectric ceramics with excellent combination of dielectric properties making them suitable for applications in microwave communication systems as resonators, filters, and antenna substrates have been
extensively studied in the last half century [1–3]. For applications, dielectric ceramics require a low dielectric loss or high quality factor (Q 9 f), a nearzero temperature coefficient of resonant frequency (TCF), and an appropriate relative permittivity (er). With the advancement of wireless communication
Handling Editor: Shen Dillon.
Address correspondence to E-mail: [email protected]; [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05141-0
J Mater Sci
toward high-frequency microwave and millimeter wave range, higher Q microwave ceramics are strongly desired [4, 5]. Some low-loss dielectric ceramics, such as Al2O3, Mg2SiO4, Ba(Mg1/3Ta2/3)O3, and Ba(Zn1/3Ta2/3)O3, have been applied in microelectronics systems over the past decades [6–9]. However, the issues of high sintering temperature ([ 1300 °C) and expensive raw materials (Ta2O5) are not enabling the long-term commercialization of these dielectrics. Therefore, it beco
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