遷移金属を多量に含む非晶質の作成と光学的性質(<小特集>セラミック材料小特集)

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In order to design a photo-selective amorphous layer to be used for a solar energy collector, it is of primary importance to study the fundamental characteristics of the amorphous candidate materials for this purpose. In this study in the first place vitrification ranges in the binary and ternary oxide systems containing high concentration of transition metal oxides have been determined by a rapid quenching technique of twin-roller method. Amorphous thin layers were obtained in the range Fe2_O_3=5〜25 mole % in the Fe_2O_3-PbO system, V_2O_5=5〜26 mole % and 35〜40 mole % in the V_2O_5-PbO system, TiO_2=5〜50 mole % in the TiO_2-PbO system. Secondly light transmittance has been measured for the amorphous materials prepared in the systems Fe_2O_3(V_2O_5)-PbO-SiO_2, Fe_2O_3 (V_2O_5)-PbO, Fe_2O_3(V_2O_5)-NaPO_3(P_2O_5) and TiO_2-PbO in the range of visible 400 mμ〜800 mμ, near infrared 800 mμ〜2.5 μ, and infrared to far infrared 5 μ〜25 μ. In the infrared region the absorption peaks associated with Fe-O, V-O, Si-O and P-O vibrations shifted to shorter wave length as PbO was substituted with SiO_2 or P_2O_5 in the Fe_2O_3(V_2O_5)-PbO-SiO_2 system or in the Fe_2O_3 (V_2O_5)-NaPO_3 (P_2O_5) system, while that of Ti-O vibration shifted to longer wave length as PbO content was decreased in the TiO_2-PbO system. From the absorption peaks observed in the near infrared and visible range, it is deduced that low valency ions Fe^<2+>, V^<4+>, V^<3+>, Ti^<3+> exist together with high valency ions Fe^<3+>, V^<5+>, Ti^<4+> and Pb^<2+> in the multi-component amorphous systems. It is interesting to note that the absorption edges in the visible range associated with the transitions of d-electrons in Fe^<2+> and V^<4+> ions shifted to shorter wave length as PbO was substituted with SiO_2 in the Fe_2O_3 (V_2O_5)-PbO-SiO_2, while that of Ti^<3+> to shorter wave length as PbO content was lowered in the TiO_2-PbO system.
社団法人日本材料学会の論文
1982-10-15

遷移金属を多量に含む非晶質の作成と光学的性質(<小特集>セラミック材料小特集)

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