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• W4386885559 abstract "In this study, CaO–MgO–B2O3–SiO2 glass-ceramics were fabricated using a sol–gel method, and their dielectric properties in the millimeter-wave (mm-wave) bands were evaluated. The glass transition temperature of the as-prepared CaO–MgO–B2O3–SiO2 glass-ceramics decreased slightly with increasing MgO/CaO ratio because the field strength of Mg2+ ions was higher than that of Ca2+ ions. After sintering at 900–950 °C, only orthorhombic CaB2O4 or monoclinic Mg2B2O5 crystallites were observed in the X-ray diffraction (XRD) patterns of the glass-ceramics, depending on the MgO/CaO ratio. The Fourier-transform infrared and Raman spectra of the glass-ceramics confirmed the XRD results. The quantity and grain size of crystallites and the content and size of pores of the glass-ceramics decreased with increasing MgO/CaO ratio. The CaO–MgO–B2O3–SiO2 glass-ceramics exhibited excellent mm-wave dielectric properties. For example, the 7.3CaO‒7.2MgO‒22.2B2O3‒63.3SiO2 glass-ceramic exhibited a dielectric constant of 4.21 and a dielectric loss of 0.0025 at 60 GHz, a breakdown strength of 14.9 kV/mm, an electric resistivity of 7.64 × 1013 Ω cm, a coefficient of thermal expansion of 4.0 ppm/°C, and a thermal conductivity of 1.29 W/mK. The low-dielectric-constant and low-loss characteristics of the MgO–CaO–B2O3–SiO2 glass-ceramics prepared in this study enables to provide very low propagation delay of signals and to offer low signal attenuation in 5 G applications." @default.
• W4386885559 created "2023-09-21" @default.
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• W4386885559 date "2023-09-01" @default.
• W4386885559 modified "2023-09-27" @default.
• W4386885559 title "Relationship between the structural and dielectric properties of sol-gel derived CaO–MgO–B2O3–SiO2 glass-ceramics for 5G applications in the millimeter-wave bands" @default.
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• W4386885559 doi "https://doi.org/10.1016/j.ceramint.2023.09.230" @default.
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