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; Department of Materials Science and Engineering, National United University, Miaoli, Taiwan, ROC; Department of Materials Science and Engineering, I-Shou University, Kaoshiung, Taiwan, ROC
Journal of Alloys and Compounds (Impact Factor: 2.73). 01/2008; 459:307-310. DOI: 10.1016/j.jallcom.2007.04.218

ABSTRACT 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%.

1 Bookmark
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Barium titanate material systems are the basic microwave dielectrics attracting particular interests and subject to many researches due to lots of intriguing properties, such as, its high temperature stability, low loss, high dielectric constant etc. at microwave range. However, BaTi409 and Ba2 Ti902 0 ceramics usually need very high sintering temperatures (-1300·C and above) to achieve sufficient density. The present work attempts to investigate the microstructures and corresponding electric properties of low temperature co-fired BaTi409 microwave dielectric ceramics with copper electrode and B-Si­ Ba-Zn-O glass in reducing atmosphere. Experimental results show that specimens of BaTi409 ceramics with various glass compositions and Cu-electrode exhibit different colors and can be attributed to glass diffusivity and reaction with Cu element during sintering. Glass composition plays an important role of the mass transportation of glass. B20J/Si02 ratio determines glass viscosity and BaO/ZnO ratio contributes to wettability of glass with BaTi409 ceramics. In x-ray diffraction patterns, we can observe different Ba-Ti-O phases with various Ba/Ti ratio. Ba4 TilJOJO may form when the BaO content in glass is too high (BaO/ZnO ratio is greater than 2). Instead, the BaTi60IJ appears as the content of BaO is low, such as BaO/ZnO ratio is smaller than 0.75. Both extreme conditions degrade the electrical properties of materials. Appropriate composition of glass not only improves material density during sintering, but also enhances phase stability of dielectrics and electrical properties.
    IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control 01/2011; 59(9). · 1.82 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: CaMgSi2O6 (CMS) ceramics prepared by the solid-state ceramic route have a sintering temperature of 1300°C/2 h. The sintering temperature of CMS was reduced below the melting point of Ag using low-melting LBS and LMZBS glasses. In the case of CMS+15 wt% LMZBS sintered at 900°C/2 h, the dielectric properties obtained were ɛr=8.2, Qu×f=32,000 GHz (10.15 GHz), and τf=–48 ppm/°C. The CMS+15 wt% LBS composite, sintered at 925°C/2 h, showed ɛr=8, Qu×f=15,000 GHz (10.17 GHz), and τf=–49 ppm/°C. The chemical compatibility of Ag with the ceramic–glass composites was also investigated for low-temperature co-fired ceramic applications.
    International Journal of Applied Ceramic Technology 09/2009; 7(s1):E98 - E106. · 1.15 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    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.
    Microelectronics International 05/2009; 26(2):45-50. · 0.73 Impact Factor

Full-text (2 Sources)

Available from
May 23, 2014