酸化物ガラス及び融液の化学反応と塩基度概念による評価の研究 : 多成分ケイ酸塩ガラスのNMR(第58回日本セラミックス協会学術賞受賞研究総説)

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Multi-component silicate glasses containing alumina and alkaline earth metal oxides have been used for optical glasses. In these glasses competitive reactions between various kinds of network-forming and network-modifying oxides occur, so that it is effective to differentiate these reactions in terms of an acid-base concept. In this report the reactivities of alkali or alkaline earth oxide with P_2O_5, Al_2O_3, B_2O_3 and SiO_2 are discussed based on the result of high-resolution solid state NMR. In alkali aluminoborosilicate glasses the population of four-coordinated boron atom, N_4 are expressed well by r/ (1 - r). However, in the case of alkaline earth aluminoborosilicate glasses, the deviation from the line of r/ (1 - r) increases in the order of BaO < SrO < CaO < MgO, where r = ([M_2O] or [MO] - [A_12O_3]) / ([M_2O] or [MO] - [Al_2O_3] + [B_2O_3]). Alkaline earth oxide reacts with Al_2O_3 first. Subsequently, residual one reacts with B_2O_3 or SiO_2. Weak base such as MgO reacts mainly with weak acids such as SiO_2 rather than B_2O_3. On the other hand, a strong base such as BaO reacts mainly with B_2O_3. The equilibrium constant of the reaction, Si (Q_3) + B (Q_3) =Si (Q_4) + B (Q_4), can be determined. When K_2O and CaO are contained in aluminoborosilicate glasses, it is possible to predict the distribution of the structural units by using the equilibrium constant of individual basic oxide.
社団法人日本セラミックス協会の論文
2004-09-01

酸化物ガラス及び融液の化学反応と塩基度概念による評価の研究 : 多成分ケイ酸塩ガラスのNMR(第58回日本セラミックス協会学術賞受賞研究総説)

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