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<p>This study investigated the vitrification range and the thermal property changes of 45Bi<sub>2</sub>O<sub>3</sub>–55SiO<sub>2</sub> (BiS) solder glass by the substitution of B<sub>2</sub>O<sub>3</sub> and ZnO. The glass composition (mol%) is as follows: (55 − x)SiO<sub>2</sub>–(45 − x)Bi<sub>2</sub>O<sub>3</sub>–yB<sub>2</sub>O<sub>3</sub>–zZnO (2x = y + z; 10 ≤ y ≤ 80, 10 ≤ z ≤ 40). The vitrification range extended to 60&#xa0;mol% for B<sub>2</sub>O<sub>3</sub> and 30&#xa0;mol% for ZnO. When 10&#xa0;mol% B<sub>2</sub>O<sub>3</sub> was substituted, trigonal [BO<sub>3</sub>] units with a two-dimensional character were preferentially formed, causing partial loosening of the glass network; as a result, the glass transition temperature (T<sub>g</sub>) decreased and the coefficient of thermal expansion (CTE) increased. With increasing B<sub>2</sub>O<sub>3</sub> content, the fractions of Q<sup>2</sup> and Q<sup>3</sup> silicate species and [BiO<sub>3</sub>] units increased together with [BO<sub>3</sub>] and [BO<sub>4</sub>] units, leading to network stabilization, higher T<sub>g</sub>, lower CTE. When ZnO was substituted, T<sub>g</sub> decreased and CTE increased compared to BiS, and even as the content increased, the thermal expansion coefficient did not become lower than that of BiS. ZnO acted as a network modifier when 10&#xa0;mol% was substituted, generating a looser glass network. Above 20&#xa0;mol%, ZnO partially behaved as an intermediate oxide and induced partial stabilization of the glass network. Nevertheless, because ZnO mainly exhibits modifier characteristics while SiO<sub>2</sub> is a strong network former, the CTE remained higher than that of BiS glass. Thus, B<sub>2</sub>O<sub>3</sub> substitution in BiS glass had a stronger structural effect on the glass network than ZnO substitution and induced more pronounced changes in thermal properties.</p>

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Effect of ZnO and B2O3 on the thermal properties of Bi2O3-SiO2 solder glasses

  • 期刊论文

  • 发表日期：

    2026年4月8日

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  • Sung Hyun Woo,
  • Jihun Jung,
  • Jung Heon Lee,
  • Hyeong-Jun Kim

摘要

This study investigated the vitrification range and the thermal property changes of 45Bi2O3–55SiO2 (BiS) solder glass by the substitution of B2O3 and ZnO. The glass composition (mol%) is as follows: (55 − x)SiO2–(45 − x)Bi2O3–yB2O3–zZnO (2x = y + z; 10 ≤ y ≤ 80, 10 ≤ z ≤ 40). The vitrification range extended to 60 mol% for B2O3 and 30 mol% for ZnO. When 10 mol% B2O3 was substituted, trigonal [BO3] units with a two-dimensional character were preferentially formed, causing partial loosening of the glass network; as a result, the glass transition temperature (Tg) decreased and the coefficient of thermal expansion (CTE) increased. With increasing B2O3 content, the fractions of Q2 and Q3 silicate species and [BiO3] units increased together with [BO3] and [BO4] units, leading to network stabilization, higher Tg, lower CTE. When ZnO was substituted, Tg decreased and CTE increased compared to BiS, and even as the content increased, the thermal expansion coefficient did not become lower than that of BiS. ZnO acted as a network modifier when 10 mol% was substituted, generating a looser glass network. Above 20 mol%, ZnO partially behaved as an intermediate oxide and induced partial stabilization of the glass network. Nevertheless, because ZnO mainly exhibits modifier characteristics while SiO2 is a strong network former, the CTE remained higher than that of BiS glass. Thus, B2O3 substitution in BiS glass had a stronger structural effect on the glass network than ZnO substitution and induced more pronounced changes in thermal properties.