(CaO, Na_2O)-Fe_2O_3-(SiO_2, B_2O_3, GeO_2)系のガラス化領域とCaO-Fe_2O_3-SiO_2系ガラスの二, 三の物性

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The glass forming regions in the systems of Na_2O-Fe_2O_3-(SiO_2 or B_2O_3) and CaO-Fe_2O_3-(SiO_2, B_2O_3 or GeO_2) Were determined. (Na_2O or CaO)-Fe_2O_3-SiO_2 glasses were found to be capable of containing up to 30 mole % Fe_2 O_3, while (Na_2O or CaO)-Fe_2O_3-(B_2O_3 0r GeO_2) glasses up to 20 mole % Fe_2O_3. The glass forming region in the system (Na_2O or CaO)-Fe_2O_3-(SiO_2 or B_2O_3) was narrower than that in the system (Na_2O or CaO)-Al_2O_3-(SiO_2 0r B_2O_3). Although the density of the CaO-Fe_2O_3-SiO_2 glasses increased linearly with Fe_2O_3 content when CaO/SiO_2 ratio was kept constant, the molar volume increased with Fe_2O_3 content. On the other hand at constant Fe_2O_3 content, the molar volume decreased with increasing CaO/SiO_2 ratio. This implies that Fe_2O_3 tends to loosen the glass structure and CaO to tighten the glass structure in the systems containing less than 40 mole % SiO_2. The dissolution ratio of Ca^2+ ions in water was almost constant for all the glasses studied, while that of Fe_^<3+> ions varied considerably. The dissolution ratio of Fe_^<3+> ions decreased when SiO_2 was replaced by CaO or Fe_2O_3, and it became 1/10 when Fe_2O_3 was partially replaced by CaO. Such changes were considered to be associated with the variation of the coordination number of Fe_^<3+> ions in the glass. The electrical conductivity of the CaO-Fe_2O_3-SiO_2 glasses changed from 10^<-6> to 10^<-11>/ ohm-cm, depending upon the Fe_2O_3 content. This variation may be explained by the change in interatomic distances of iron ions in the glass.
社団法人日本材料学会の論文
1983-03-15

(CaO, Na_2O)-Fe_2O_3-(SiO_2, B_2O_3, GeO_2)系のガラス化領域とCaO-Fe_2O_3-SiO_2系ガラスの二, 三の物性

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