Sinterability and Dielectric Properties of ZnNb2O6 – Glass Ceramic Composites

The desirable characteristics of the microwave materials include excellent dielectric constant εr, low dielectric loss (high quality factor, Q*f0 value), and small temperature coefficient (~0ppm/°C) of resonant frequency (Tf). The advantages of using a glass-ceramic include shape stability during the sintering stage, improved dielectric properties, mechanical strength, and controlled thermal expansivity. In the present study, glass-ceramic compositions consisting of a glass system (BaO-TiO2-SiO2-Al2O3) and a ceramic filer (BaNd2Ti5O14) were prepared. The glass and glass-ceramic compositions were evaluated for sintering behavior such as shrinkage, densities, thermal properties, and microstructures. In addition, the microwave dielectric properties (≈ 15~20 for εr, > 6000 GHz for Q*f0) were determined by a network analyzer at 6-8 GHz. These results suggest that the compositions can be a candidate for LTCC dielectric materials.

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Effect of Different Crystallization Temperature on Dielectric Properties of BaO–SrO–PbO–TiO2–SiO2–Nb2O5 Glass-Ceramic Composites

Advanced Functional Materials ◽

10.1007/978-981-13-0110-0_59 ◽

2018 ◽

pp. 541-548

Author(s):

Junyou Chen ◽

Qingmeng Zhang ◽

Feihu Tan ◽

Peng Zhou ◽

Min Zhou

Keyword(s):

Dielectric Properties ◽

Glass Ceramic ◽

Crystallization Temperature ◽

Ceramic Composites

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Low temperature sintering process, phase evolution and dielectric properties of BaTi4O9-filled B–La–Mg–Ti–O glass/ceramic composites

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-017-7814-5 ◽

2017 ◽

Vol 28 (24) ◽

pp. 18646-18655

Author(s):

Haishen Ren ◽

Xiaogang Yao ◽

Tianyi Xie ◽

Mingzhao Dang ◽

Haiyi Peng ◽

...

Keyword(s):

Dielectric Properties ◽

Low Temperature ◽

Glass Ceramic ◽

Phase Evolution ◽

Ceramic Composites ◽

Low Temperature Sintering ◽

Sintering Process

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Crystallization and Dielectric Properties of BaO-SrO-PbO-TiO2-Nb2O5-SiO2 Glass-Ceramic Composites with La2O3 Addition

Journal of Physics Conference Series ◽

10.1088/1742-6596/2085/1/012036 ◽

2021 ◽

Vol 2085 (1) ◽

pp. 012036

Author(s):

Qingmeng Zhang ◽

Junyou Chen ◽

Min Zhou ◽

Yanyun Zhao

Keyword(s):

Dielectric Constant ◽

Grain Size ◽

Dielectric Properties ◽

Glass Ceramic ◽

Glass Sample ◽

Tungsten Bronze ◽

Ceramic Composites ◽

Ceramic System ◽

Ceramic Phase ◽

Addition Amount

Abstract Glass-ceramic composite samples with different La2O3 content were prepared via melt-quenching followed by controlled crystallization. X-ray diffraction(XRD) analysis reveals that when the addition amount of La2O3 in the glass sample is less than 1mol%, two phases of perovskite structure and tungsten-bronze structure are formed after annealing at 1000°C for 3h. When the addition amount of La2O3 in the glass sample is increased to 2mol%, a new phase of pyrochlore structure is formed. Moreover, the addition of La2O3 causes the change in the lattice parameters of the glass-ceramic crystal phase. The microstructure observed that the ceramic phase grain size is in the nanometer level. The shape of some grains becomes an elongated structure when the La2O3 content in the sample increases to 2 mol%, and the grain size is increased significantly. The dielectric constant of the BaO-SrO-PbO-TiO2-Nb2O5-SiO2 glass-ceramic system is decreased with the increase of La2O3 addition, and the dielectric loss of the sample is decreased to the range of 0.003-0.008. The electric field stability of the dielectric constant was significantly improved with the addition of La2O3, indicating that adding a certain proportion of La2O3 to the BaO-SrO-PbO-TiO2-Nb2O5-SiO2 glass-ceramic system can effectively improve the dielectric properties, and it has a promising application as a dielectric material.

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