加熱処理したＮａ２Ｏ‐ＢａＯ‐Ａｌ２Ｏ３‐ＴｉＯ２系ガラスのフォトクロミズムとその原因

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タイトル別名
  • Photochromism and Its Origin of Heat-Treated Na<sub>2</sub>O-BaO-Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> Glasses
  • カネツ ショリシタ Na2O BaO Al2O3 TiO2ケイ ガラス ノ フ

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抄録

Glasses with various compositions in the systems (nNaO0.5+mBaO)-AlO1.5-TiO2, where n/m is 1/0, 2/1, 1/1, 1/2 or 0/1 (Fig. 1), were heated to various temperatures from 650°C to 950°C at a rate of 5°C/min in a SiC furnace, and then cooled outside the furnace. All the glasses examined darkened on 60 min-irradiation of 365nm light of 6 W ultraviolet lamp, after heated to certain temperatures depending on their compositons (Table 1). The darkening of one of the heat-treated specimens, A 3 in Table 1, was enhanced by the addition of a small amount of FeO1.5 or ZnO, whereas it was suppressed by the addition of CeO2 (Table 2, Figs. 2 and 3). On the surfaces of all the heat-treated specimens showing photochromism, an unknown crystalline phase named X in Table 3 was detected. All the specimens containing the X phase, however, did not always show the photochromism (Table 3). Consequently, the cause of the photochromism of the heat-treated glasses described above was attributed to defects, probably induced by impurities, in the X phase precipitated on the surfaces of the glasses. The X phase was observed on the surfaces of both the BaO-free glasses and Na2O-free glasses (Table 3). The fluorescence X-ray analysis of powders of a NaO0.5-BaO-AlO1.5-TiO2 glass (A 9 in Table 1), which had been heated to 700°C (Fig. 5 (A)) and immersed in a 2 N NaOH solution at 95°C for 100h (Fig. 5 (B)) showed that the X phase is deficient in Al and rich in Ti (Table 4). The X phase was, therefore, considered to be mostly composed of TiO2. The structure of the X phase was identified as one of the cubic structures in Pa 3, P 4132, P 4232, Pn 3m and P*3* diffraction groups with a lattice constant of a=11.54Å by indexing the powder diffraction peaks of this phase (Fig. 4).

収録刊行物

  • 窯業協會誌

    窯業協會誌 90 (1048), 698-703, 1982

    公益社団法人 日本セラミックス協会

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