On the Color of Glasses Containing Silver and Titanium

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  • チタンと銀をともに含有するガラスの着色について
  • チタン ト ギン オ トモニ ガンユウ スル ガラス ノ チャクショク ニ ツイテ

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Glass may be colored by titania and silver oxide, and the authors made the experiments in order to know the mutual action on the coloring of glass.<br>Specimens were prepared by adding titania to the maximum limit of glass formation and a small amount of silver oxide to the six kinds of the basic glasses of the systems; silicate, borosilicate, borate, and phosphate.<br>The silicate, borosilicate and borate glasses showed the rapid and stable development of brown to deep red colors even by quenching, which, however, showed no change of color by reheating.<br>Phosphste glasses were colored purple, which also showed no further color development by reheating. The former gave the absorption at 460mμ, while the latter did not show this absorption due to the separation of Ag.<br>The authors attribute the rapid separation of silver to the thermal change of the equilibrium<br>Ti3+_??_Ti4+<br>which acts as a thermoredusing agent during the cooling of glass, and accordingly the reaction<br>Ag++Ti3+→Ag°+Ti4+<br>takes place.<br>The change of the absorption spectrum from ordinary silver containing glasses may be interpreted by the separation of TiO2 around the micro-crystal of silver.

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