Effect of properties and crystallization behavior of BaO–ZnO–B₂O₃–SiO₂ glass on the electrical conductivity of Cu paste

Abstract

The extensive application of multilayer ceramic capacitors provides an attractive development for terminal electrode pastes. However, the growing requirement for advanced glass materials used in terminal electrode pastes is substantiated. Therefore, to advance the development of electrode pastes, better development and deeper exploration of glass powder are required. Here, a series of BaO-ZnO-B 2 O 3 -SiO 2 (BZBS) glasses were prepared by melt-quenching technique, which are used to investigate the effect of the introduction of BaO on structure and properties of the ZnO-B 2 O 3 -SiO 2 (ZBS) glass. With the introduction of BaO, the relative amount of [BO 4 ] was much less, which made the glass network structure loosen, decreased the glass transition temperature (T g ) and increased the coefficient of thermal expansion of the glass. The decreasing contact angle was observed on the surface of a barium titanate (BaTiO 3 ) substrate. When the BaO content was around 3-7 mol%, the stability of ZBS glass frit could be strengthened by inhibiting the precipitation of Zn 2 SiO 4 crystal. In addition, to further characterize the effect of glass on terminal electrode paste, BZBS glass powder was adopted to prepare copper electrode paste, which was printed on the BaTiO 3 substrate and subsequently fired at 800 • C for 10 min. With the related copper paste containing ZBS glass doped with 7 mol% BaO, the optimum value of acid resistance and sheet resistance (1.99 mΩ) were exhibited, at which the coated copper paste formed a dense conducting layer.

Study on Low-Temperature Conductive Silver Pastes Containing Bi-Based Glass for MgTiO3 Electronic Power Devices

“…A peak at 1130 cm −1 is referred to as the B-O-B tensile vibration in the [BO 4 ] unit [ 27 ]. The bands in the range 1300–1400 cm −1 are caused by the asymmetric stretching vibrations of the B-O bonds in the [BO 3 ] unit [ 28 ]. With the increase in the Bi 2 O 3 content, their intensities and widths decreased.…”

“…Infrared absorption spectra of glass samples.Table 5. FT-IR peak assignments for the glass samples.Band Position (cm −1 ) Assignment 430-520 Bi-O-Bi in the [BiO 6 ] octahedral unit [23] 690-730 Bending vibrations of oxygen bridges between two [BO 3 ] units (BIII-O-BIII) [25] 830-900 Symmetric stretching vibrations of Bi-O bonds in [BiO 3 ] pyramidal units [30] 990-1080 Stretching vibrations of B-O bonds in [BO 4 ] units from tri-, tetra-, and penta-borate groups [25,26] 1130 B-O-B stretching vibration in [BO 4 ] [27] 1300-1400 Asymmetric stretching of B-O bond in [BO 3] units[28]…”

The silver paste containing ZnO-B2O3-SiO2 glass sintered at high temperature with low solid content formed high performance conductive thick film on MgTiO3 microwave ceramics

“…The bonding phase powder is usually glass powder, which significantly influences the electrical and mechanical properties of the silver film. In the sintering process, glass powder can not only promote the sintering of silver particles to form a dense network structure but also affect the adhesion between the silver film and the MgTiO 3 substrate [21,22]. Organic additives (ethyl cellulose, diethylene glycol butyl ether) are the primary carriers of the conductive and bonding phases and can control the rheological properties, viscosity, and screen-printing performance of the slurry [23][24][25].…”