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2010 | 117 | 3 | 471-477

Article title

Absorption Studies on Some Silicate and Cabal Glasses Containing NiO or Fe_{2}O_{3} or Mixed NiOi + Fe_{2}O_{3}

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Abstracts

EN
Ultraviolet and visible absorption of some sodium and potassium silicate and cabal glasses containing nickel oxide, ferric oxide or both nickel and ferric oxides together have been investigated. In alkali silicate glasses, nickel ions reveal no ultraviolet absorption bands but they show characteristic visible absorption bands due to octahedral and tetrahedral coordinations while iron ions show weak visible absorption bands which are related to ferric ions mostly in tetrahedral state, especially at high alkali oxide content; also iron ions reveal charge transfer ultraviolet absorption bands which are assigned mostly to ferric ions with few ferrous contributions. The proportion of tetrahedral state increases with the increase in the alkali oxide content for the two transition metal oxides. In cabal glasses, nickel ions tend to exist mostly in octahedral state, while ferric ions exist mostly in octahedral and some in tetrahedral form, all the absorption obtained are attributed to their respective energy levels. The ratio of the different coordinations states are discussed in relation to the glass composition.

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Contributors

author
  • Faculty of Education, Suez Canal University, Arish, Egypt
author
  • Faculty of Education, Suez Canal University, Arish, Egypt
author
  • Faculty of Education, Suez Canal University, Arish, Egypt
author
  • Faculty of Education, Suez Canal University, Arish, Egypt

References

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bwmeta1.element.bwnjournal-article-appv117n308kz
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