Sintering Behavior and Microwave Dielectric Properties of Low-Loss Li Mg Zr O Ceramics 6 7 3 16 Doped with Different LiF Additives

Abstract

The Li Mg Zr O samples were prepared with the pure cubic phase at sintering temperatures of 1300-1550 °C using the traditional solid state 6 7 3 16 method in our previous work. Sintering characteristics and microwave properties were investigated as a function of sintering temperatures. The samples sintered at 1500 °C showed the best properties of the Q•f value of 81,284 GHz (at 8.94 GHz), dielectric constant value of 14.22 and the τ value of-21.56 ppm/°C. Now complex permittivity value of Li Mg Zr O ceramic sintered at 1500 °C were characterized by the infrared f 6 7 3 16 spectra based on the classical harmonic oscillator model. In order to reduce the sintering temperature, lithium fluoride were used as sintering additives, and then the apparent densities, phase compositions and dielectric properties of Li Mg Zr Ox (0 wt% LiF ≤ x ≤ 5 wt% LiF) were 6 7 3 16 discussed as a function of lithium fluoride additions. As a result the densification temperatures for Li Mg Zr O-5 wt% LiF were reduced to be 6 7 3 16 1100 °C, which were significantly lower than that of the matrix (1500 °C). Excellent microwave dielectric properties were obtained in

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“…With the increase of deionized water, the crystallization of BT increases, thus a uniform polycrystalline BT layer can be formed on the surface of the Ni powders. When the deionized water content reaches 16 wt%, a dense and In the sintering process of MLCCs, Ni electrode layer is required to have a high anti-oxidation property to adapt to the binder burning stage [30]. Therefore, the coated samples with different deionized water contents were pre-sintered at 400 • C for 1 h. The XRD patterns are shown in Figure 4(a), and the peak ratio of the main peak for nickel oxide (NiO) and the main peak for Ni after removing the background is plotted in Figure 4(b).…”

“…In the sintering process of MLCCs, Ni electrode layer is required to have a high anti-oxidation property to adapt to the binder burning stage [30]. Therefore, the coated samples with different deionized water contents were pre-sintered at 400 • C for 1 h. The XRD patterns are shown in Figure 4(a), and the peak ratio of the main peak for nickel oxide (NiO) and the main peak for Ni after removing the background is plotted in Figure 4(b).…”

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“…However, using the Debye theory, we ascertained that the polarization-relaxation mechanism undoubtedly contributed to the improvement of the dielectric dissipation capacity. According to the Debye theoretical models, for low-conductivity materials, the complex permittivity can be described by the following equations [15,[38][39][40][41]:…”