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: 2.73). 07/2008; 459(1-2):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%.


Available from: Chi-Shiung Hsi, Apr 23, 2015
1 Follower
  • [Show abstract] [Hide abstract]
    ABSTRACT: A core-shell nano-scale mixing technique was applied to fabricate BaTiO3/glass nanocomposites in order to preserve the nano-grain dielectric properties of BaTiO3 after sintering and enhance the bulk composite energy storage capability. Coating layers of low melting glasses of lead borosilicate glass (65PbO-20B2O3-15SiO2, mol%) and bismuth borosilicate glass (65Bi2O3-20B2O3-15SiO2, mol%) were deposited onto BaTiO3 nanoparticles in chemical solution by a sol-precipitation method under ultrasonic agitation. Transmission electron microscopy (TEM) results confirmed the formation of core-shell nanostructures with controllable shell thicknesses between 2 and 18 nm. X-ray diffraction (XRD) patterns showed that no crystalline peaks were detected from the glass coating layer. Fourier transform infrared (FT-IR) spectra indicated a glass network structure of lead borosilicate glass and bismuth borosilicate glass, respectively. High densifications were achieved for both composites by sintering at low temperatures (≤ 900°C). Noticeable grain growth was observed, however, for lead borosilicate glass-coated BaTiO3 (Pb-BT) composite while almost no grain growth was observed for bismuth borosilicate glass-coated BaTiO3 (Bi-BT) nanocomposite. This disparity was attributed to the different interactions between the BaTiO3 core and two glasses during the sintering process, as revealed by the XRD study. Dielectric properties and energy storage capability of Bi-BT nanocomposite were investigated in detail. Bi-BT nanocomposite showed high polarization, high dielectric breakdown strength (≥1000 kV/cm), postponed polarization saturation, and low remnant polarization with the discharge energy density of ~10 J/cm3 at 1000 kV/cm. Thus, Bi-BT core-shell nanocomposite appears to be a promising material system for energy storage capacitor applications.
    08/2014; 2(42). DOI:10.1039/C4TA04282D
  • 01/2013; 32(2). DOI:10.1515/htmp-2012-0116
  • [Show abstract] [Hide abstract]
    ABSTRACT: Thin films of the BaTiO3–Bi(Mg1/2Ti1/2)O3 (BT–BMT) solid-solution system were fabricated with the aim of achieving a stable temperature coefficient of capacitance (TCC) favorable for high-temperature electronics. A single perovskite phase with pseudocubic symmetry was obtained for the films fabricated by chemical solution deposition on (111)Pt/TiO2/(100)Si substrates in the composition range of x = 0–0.80 for (1 − x)BT–xBMT. BMT added to the BaTiO3-based films enhanced the crystallinity of the perovskite phase and resulted in saturated P–E hysteresis behavior with remanent polarization of up to 13 µC/cm2. BMT addition led to gradual dielectric relaxation, which also resulted in stable TCC behavior with a relative dielectric constant of approximately 400 in the temperature range of RT − 400 °C, especially for the BT–BMT films with x = 0.20–0.40.
    Japanese Journal of Applied Physics 09/2014; 53(9S):09PA11. DOI:10.7567/JJAP.53.09PA11 · 1.06 Impact Factor