Sintering Behavior and Dielectric Properties of BaTiO3 Ceramics with Glass Addition for Internal Capacitor of LTCC

Particulate Materials Research Center, Department of Resources Engineering, National Cheng Kung University, Tainan, Taiwan, ROC
Journal of Alloys and Compounds (Impact Factor: 3). 07/2008; 459(1-2):307-310. DOI: 10.1016/j.jallcom.2007.04.218


The addition effects of ZnO–B 2 O 3 –SiO 2 (ZBS) glass on both the sintering behavior and dielectric properties of BaTiO 3 were investigated in developing low-temperature-fired BaTiO 3 -based ceramics for LTCC devices. X-ray diffractometer (XRD), scanning electron microscopy (SEM), and a dilatometer were used to examine the effect of ZBS glass on BaTiO 3 densification and the chemical reaction between the glass and BaTiO 3 . The results indicate that ZBS glass can be used as a sintering aid to reduce the sintering temperature of BaTiO 3 from 1300 to 900 • C without secondary phase formation. The dielectric properties of BaTiO 3 with ZBS glass sintered at 900 • C show a relative density of 95%, a high dielectric constant of 994, and a dielectric loss of 1.6%.

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Available from: Chi-Shiung Hsi, Oct 04, 2015
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    • "Some previous studies have shown that low-melting glasses added in the ceramics, such as B 2 O 3 – SiO 2 [5], BaO–ZnO–B 2 O 3 [6], ZnO–B 2 O 3 [7] [8] and ZnO– B 2 O 3 –SiO 2 [9], have the advantages of lowering sintering temperatures and enhancing densification of materials. For instance, ZnO–B 2 O 3 –SiO 2 glass has been demonstrated to be good flux former to reduce the sintering temperature of BaTiO 3 ceramics from 1300 1C to 900 1C [9]. Moreover, the addition of glass has been reported as to be an effective "
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    • "Therefore, new middle-and high-k type dielectric materials, e.g. Bi 2 (Zn 1/3 Nb 2/3 ) 2 O 7 -based dielectric tape with dielectric constant 80 and dielectric loss 0.001 (Bennet et al., 2007) or BaTiO 3 with ZnO-B 2 O 3 -SiO 2 glass with dielectric constant of about 1,000 and dielectric loss of 0.016 (Hsiang et al., 2008), compatible with LTCC technology are developed and investigated. "
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    ABSTRACT: Purpose – A capacitor is a basic electronic passive component. Thick-film technology allows manufacturing of capacitors covering the range of small and medium capacitances and they have been investigated in depth already. Low temperature co-fired ceramics (LTCC) technology makes it possible to fabricate buried capacitors, which leads to increased packaging density, but such components’ properties are not well known. The purpose of this paper is to present the results of investigations on thick-film and LTCC capacitors made in various technological variants. Design/methodology/approach – Thick-film and LTCC capacitors were made in various technological variants. Different capacitor inks, metallurgy of electrodes and component constructions were investigated. Basic electrical properties and stability were determined. An electrical equivalent circuit of such components was developed based on frequency and temperature characteristics. Findings – Simple electrical equivalent circuits of self-made thick-film and LTCC micro-capacitors were developed based on measurements in frequency and temperature domain. Good fitting accuracy was obtained. The bulk material section of model is predominant in the low-frequency range. Interface region and serial resistance influence are revealed at higher frequency, affecting mainly dissipation factor value. Also, temperature and thermal ageing have affected strongly on that part of the model. Originality/value – The paper usefully examines the electrical properties and electrical equivalent models of thick-film and LTCC micro-capacitors.
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