Influence of (CoO, CaO, B 2 O 3 ) additives on thermal and dielectric properties of BaO–Al 2 O 3 –SiO 2 glass–ceramic sealant for OTM applications

Borhan, Adrian Iulian; Gromada, Magdalena; Nedelcu, G.G.; Leontie, Liviu

doi:10.1016/j.ceramint.2016.03.199

Cited by 24 publications

(7 citation statements)

References 59 publications

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“…The values of both dielectric constant and optical dielectric constant inclusive of the variation with CuO molar concentration are presented in Table 6 and Figure 13 respectively. Dielectric behaviours in materials are results of extrinsic and intrinsic factors such as oxygen vacancies, porosity, grain size, lattice vibration modes as well as chemical homogeneity [47]. According to Zulke y et al (2016) [48], the dielectric features at lower frequencies depend on the ionic, electronic interfacial and dipolar polarizations and thus alternating voltage induces the diffusion of mobile charges usually impurity ions.…”

Section: √ ( )mentioning

confidence: 99%

Dielectric Constant, Metallization Criterion and Optical Properties of CuO Doped TeO2–B2O3 Glasses

Nazrin

Umar

Halimah

et al. 2022

J Inorg Organomet Polym

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Copper oxide doped TeO 2 -B 2 O 3 glass system with empirical formula; [(B 2 O 3 ) 0.3 (TeO 2 ) 0.7 ] 1-x (CuO) x using the melt quenching method, where x = 0.0, 0.01, 0.015, 0.02, and 0.025 was combined. The glass samples' density and molar volume were measured, followed by characterizations using the UV-Vis, Fourier transform infrared (FTIR) and X-ray diffraction (XRD) spectroscopes. The amorphous or glassy nature of glass samples was proven by the XRD spectra except for the pure borotellurite sample which showed a peak around 2θ = 20 o , indicating α-TeO 2 crystalline phase presence. The FTIR spectral analysis suggested the presence of BO 3 , TeO 3 and TeO 4 as the structural functional units in the glass samples.The UV-Vis spectra showed no presence of any sharply de ned edges, a rming the amorphous or glassy nature of the glass materials. Physical parameters e.g. molar volume, density, oxygen packing density (OPD), inter ionic distance of Cu 2+ ions, concentration of copper ion per unit volume (N), as well as the polaron radius data were presented and discussed. Also, the direct bandgap (3.8900 to 3.5900 eV) , indirect bandgap (3.3200 to 3.0800 eV), refractive index (2.318 to 2.378), dielectric constant (5.3731 to 5.6549), optical dielectric constant (4.3731 to 4.6549), refractive index based metallization criterion (0.406885 to 0.391916) and the band gap based metallization criterion (0.407431 to 0.392428) were analysed and discussed. Based on the metallization criterion and values of refractive index, the glasses are good candidates for optoelectronic and laser applications. Meanwhile, the dielectric constants' values of the present glasses indicate their suitability bandpass lters and microelectronic substrates applications.

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Section: √ ( )mentioning

confidence: 99%

Dielectric Constant, Metallization Criterion and Optical Properties of CuO Doped TeO2–B2O3 Glasses

Nazrin

Umar

Halimah

et al. 2022

J Inorg Organomet Polym

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“…This minimizes CTE mismatch (as shown under silicate seals), resulting in seal cracking. Recently, Borhan et al, [33] have reported on adjusting the thermal properties of a borosilicate glass-ceramic seal for SOFC. Optimized compositions, CTE, Tg, and Td are 30SiO2-20BaO -20SrO -30B2O3 (mol.%), 11.7x 10 6 0 C 1 , 650 °C, and 663 °C, respectively.…”

Section: Borosilicate Sealantmentioning

confidence: 99%

Progress in Glass-Ceramic Seal for Solid Oxide Fuel Cell Technology

Gunawan

Sulistyo

Setyawan³

2021

ARFMTS

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Solid oxide fuel cells (SOFCs) have emerged as promising energy conversion devices nowadays. SOFC consists of several components such as cathode, anode, electrolyte, interconnects, and sealing materials. In planar SOFC stack construction, the sealant and interconnection functions play an important role. Glass and ceramics are quite popularly used as SOFC sealing materials to achieve several functions including preventing leakage of fuel and oxidants in the stack and electrically isolating cells in the stack. In this review, material preparation, material composition, ceramic properties especially thermal properties are compared from various systems that have been developed previously. The main challenges and complexities in the functional part of SOFC sealants include: (i) chemical incompatibility and instability in the oxidizing and reducing environment by adjusting the value of the thermal expansion coefficient (CTE) with the interconnecting material during SOFC operation, and (ii) insulation of oxidizing fuels and gases by matching CTE anode and cathode. Also, the sealant glass transition determines the maximum permissible working temperature of the SOFC. The choice of method and analysis will provide data on various ceramic attributes. The search for thermal attributes consisting of Glass transition (Tg), Deformation temp (Td), Crystallization temp (Tx), Melting pt (Tm) became a focus on SOFC sealant development.

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“…1(b). Lim et al reported the formation of crystallization of BaSi2O5 from the barium based silica rich glass [12] whereas Borhan et al reported the presence of BaAl2Si2O8 and Ba2Si3O8 in BaO-Al2O3-SiO2 glass-ceramic [26]. It is known that the formation of secondary phases is common in commercial LTCC tapes [27].…”

Section: Phase Compositionsmentioning

confidence: 99%

“…The dielectric constant obtained at microwave frequency is less as compared to that obtained at 1 MHz and this is due to the difference in polarization mechanisms. According to the literature reports, silica rich glasses usually have low dielectric constant because of the low dielectric constant of silica [26]. The dielectric properties of the composite are influenced by densification and the constituent phases in the composite [29].…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Low κ, low loss alumina-glass composite with low CTE for LTCC microelectronic applications

Induja

Surendran

Varma

et al. 2017

Ceramics International

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Alumina based low κ LTCC composite has been prepared with the use of AGC commercial glass (DL828). The 30 wt% Al2O3-70 wt% AGC glass composite was sintered at 875 °C (2 h). X-ray diffraction study indicated the presence of BaSi2O5, BaAl2Si2O8 and Ba2Si3O8 secondary phases in addition to Al2O3 in the composite. The bulk ceramic sintered at 875 °C has κ of 4.80 and tan δ of 0.007 at 1 MHz. The composite shows good microwave dielectric properties: κ of 4.52, tan δ of 0.004 and τκ close to zero. The composite has a low CTE of 4.38 ppm/°C which is close to that of silicon used in microelectronic industry and thermal conductivity of 1.41 W m −1 K −1 at room temperature. The results indicate that the Al2O3-AGC glass composite has good dielectric, thermal properties and is chemically compatible with Ag electrode indicating it as a promising candidate for low κ LTCC substrate applications.

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Influence of (CoO, CaO, B 2 O 3 ) additives on thermal and dielectric properties of BaO–Al 2 O 3 –SiO 2 glass–ceramic sealant for OTM applications

Cited by 24 publications

References 59 publications

Dielectric Constant, Metallization Criterion and Optical Properties of CuO Doped TeO2–B2O3 Glasses

Dielectric Constant, Metallization Criterion and Optical Properties of CuO Doped TeO2–B2O3 Glasses

Progress in Glass-Ceramic Seal for Solid Oxide Fuel Cell Technology

Low κ, low loss alumina-glass composite with low CTE for LTCC microelectronic applications

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