Ni含有ガラスと透明結晶化ガラスの光吸収及び発光スペクトルとその配位数との関係

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概要

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• The absorption and emission spectra of Ni-doped glasses and transparent glass-ceramics are discussed in relation to its coordination number. The results evidenced that the color changed drastically to deep pink from yellow for the lithium metasilicate crystal based transparent glass-ceramics and to blue from brown for the spinel crystal based transparent glass-ceramics after crystallization, respectively. The absorption spectra of lithium metasilicate and Spinel glasses suggest the existence of a tetrahedral Ni^<2+> ion and a trigonal bipyramid Ni^<2+> ion. On the contrary, tetrahedral Ni^<2+> ions in the lithium metasilicate transparent glass-ceramics and the octahedral Ni^<2+> ion in Spinel transparent glass-ceramics are dominant. The emission at around 580nm was observed in Spinel transparent glass-ceramics under the excitation of 380nm, however, a very weak or no emission was observed in the lithium metasilicate glass, lithium metasilicate transparent glass-ceramics and Spinel glass under the excitation of 430nm. This emission might be due to a ^1T_1(D)→^3A_2(F) transition after the excitation from ^3A_2(F) to ^3T_1(P) of the octahedral Ni^<2+> ions. In addition, only Spinel transparent glass-ceramics exhibits a broad NIR emission at around 1220nm under the excitation of a 974nm laser diode. This emission may be due to ^3T_2 (F)→^3A_2(F) transition. It is considered that the tetrahedral Ni^<2+> ion is located between the chains in the lithium metasilicate crystal.

• 2006-09-01

著者

• KHONTHON Sasithorn

  School of Ceramic Engineering, Institute of Engineering, Suranaree University of Technology

• Ohishi Yasutake

  Department Of Future-oriented Basic Science And Materials Toyota Technological Institute

• MORIMOTO Shigeki

  School of Ceramic Engineering, Institute of Engineering, Suranaree University of Technology

• Morimoto Shigeki

  School Of Ceramic Engineering Institute Of Engineering Suranaree University Of Technology

• Khonthon Sasithorn

  School Of Ceramic Engineering Institute Of Engineering Suranaree University Of Technology

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• Ni含有ガラスと透明結晶化ガラスの光吸収及び発光スペクトルとその配位数との関係
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