Effects of Na2O on optical and radiation shielding properties of xNa2O-(20-x)K2O-30V2O5-50TeO2 mixed alkali glasses

Tuning the thermal and insulation properties of bismuth borate glass for SiC power electronics packaging

“…The impedance shows the opposite trend, reaching its maximum value of 8.5 × 10 12 Ω/⋅cm at 5 mol% BaO content (Figure 5C), indicating that 5BZCBB possesses excellent insulation properties, advantageous for electronic encapsulation. Figure 5B and C reveals that Direct Current (DC) conductivity and impedance do not linearly superimpose with cationic conductivity, indicating a mixed ionic effect (MIE) consistent with prior studies, [25][26][27][28] where ions govern glass conductivity under constant transition metal oxides, 25,27,45 and nonlinear superposition causes MIE in mixed cationic glass. 23,24 The Raman spectrum shows that ZnO, as an intermediate, can enter the glass network as [ZnO 4 ] tetrahedra.…”

“…Therefore, it is meaningful to systematically investigate the compositional changes in Bi-based glass for practical SiC power device packaging. [25][26][27][28] Herein, we developed the Bi-based glass as an encapsulation material for SiC power devices. In order to lower the softening temperature and improve insulation performance to be compatible with SiC devices, we modified these properties by compositing the glass with the addition of Ba 2+ ions.…”

“…However, relative research is still in infancy. Therefore, it is meaningful to systematically investigate the compositional changes in Bi‐based glass for practical SiC power device packaging 25–28 …”

Effect of B2O3 addition on thermal and optical properties of TeO2–ZnO–Bi2O3–TiO2 glasses

“…Similar results have also been reported in other works [45,46]. Increasing the amount of BO portion creates a more compact network and this leads to the lowering of the top of the valence band resulting in the increase of E g [46,47]. Linked to refractive index as discussed in previous sub-section, it is clearly seen that refractive index and E gap respond conversely to the change of BO/NBO ratio.…”

“…where α 0 is a constant and E u is the width of Urbach energy, the width of the band tail energy near the fundamental absorption edge arising from static disorder of glass structure or the extent of band tail in electronic density state in the region of the forbidden energy gap [47,55,56]. Figure 11 presents the plot of lnα as function of photon energy (hv).…”