Low Temperature Sintering Ba3Ti5Nb6O28 Ceramics with Tunable Temperature Coefficient of Dielectric Constant

Dong Guo; Zhi Yuan Ling; Xing Hu

doi:10.4028/www.scientific.net/KEM.368-372.170

Paper Titles

Microwave Dielectric Ceramics and Devices for Wireless Technologies
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Sintering and Microwave Dielectric Characteristics of ZnTa_2-xxNb_xO₆ Ceramics
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Preparation and Characterization of Citrate Sol-Gel Derived CaLa₄Ti₄O₁₅ Microwave Dielectric Ceramics
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Low Temperature Sintering Ba₃Ti₅Nb₆O₂₈ Ceramics with Tunable Temperature Coefficient of Dielectric Constant
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Preparation and Dielectric Properties of BaO-Sm₂O₃-4TiO₂ Microwave Ceramics with B₂O₃ and CuO Addition Sintered in Low Temperature
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Low Temperature Sinter-Ability of Microwave Dielectric Ceramics 0.4(Ca_0.61Nd_0.26)TiO₃-0.6(Li_0.5Sm_0.5)TiO₃
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Low Temperature Sintering and Microwave Dielectric Properties of Zinc Titanate Ceramics for LTCC Applications
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Change of Microwave Dielectric Loss during the Solid-Reaction Synthesis of SrFeCo_0.5O_y
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 368-372Low Temperature Sintering Ba3Ti5Nb6O28 Ceramics...

Low Temperature Sintering Ba₃Ti₅Nb₆O₂₈ Ceramics with Tunable Temperature Coefficient of Dielectric Constant

Abstract:

A middle permittivity dielectrics with the tunable temperature coefficient of dielectric constant (τε) in the BaO-TiO2-Nb2O5 system, Ba3Ti5Nb6O28, has been synthesized and characterized. The dielectric properties of Ba3Ti5Nb6O28 measured at 1MHz are as follows: dielectric constant (εr) ~38, dielectric loss (tanδ)<0.0002, temperature coefficient of dielectric constant (τε)~-22ppm/°C. The Ba3Ti5Nb6O28 phase satisfies the requirements of NP0 (MLCC) dielectrics, but the sintering temperature of the Ba3Ti5Nb6O28 phase (1250~1300°C) is too high to be co-fired with Ag or Cu electrodes. To lower the sintering temperature, an appropriate amount of ZnO-B2O3 frit (5~7wt.%) was added to the Ba3Ti5Nb6O28 phase and dense ceramics were obtained at the sintering temperature lower than 1000°C. Furthermore, the CaNb2O6 phase with the positive τε of 65ppm/°C was incorporated into the Ba3Ti5Nb6O28 phase to adjust the temperature coefficient of dielectric constant from negative to positive(-22~30ppm/°C). Near zero τε ceramics with high εr (38) and low tanδ (0.0002) were obtained at the composition of Ba3Ti5Nb6O28/ CaNb2O6/ ZB frit=76:17:7 wt.%.

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Key Engineering Materials (Volumes 368-372)

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170-172

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https://doi.org/10.4028/www.scientific.net/KEM.368-372.170

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February 2008

Authors:

Dong Guo, Zhi Yuan Ling, Xing Hu

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Dielectric, Electroceramics, Frites

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