Optical properties of Cr3+ ion in lithium metasilicate Li2O · SiO2 transparent glass–ceramics
Optical properties of Cr3+ ion in lithium metasilicate Li2O · SiO2 transparent glass–ceramics
复制标题
DOI：
10.1016/j.jnoncrysol.2008.01.025
复制
发表时间：
2008-06
影响因子：
3.5
通讯作者：
S. Morimoto;Sasithorn Khonthon;Y. Ohishi
中科院分区：
文献类型：
--
作者：
S. Morimoto;Sasithorn Khonthon;Y. Ohishi
研究了Cr ~（3+）离子在Li_2O·SiO_2透明微晶玻璃中的光学性质。析出的主晶相为偏硅酸锂（Li 2 O·SiO2）晶体。结晶度为65-75%，晶粒尺寸为20- 35 nm。结晶后颜色从翠绿色绿色急剧变为深粉色。新的和强的吸收带出现，吸收强度增加约10倍的玻璃。这些新的吸收带被发现是来自于Cr 3+离子在八面体网站的偏硅酸锂晶格。Cr ~（3+）离子取代了三个Li ~+离子，占据了硅酸锂晶体[SiO_4] n链之间的畸变八面体位置。配位场参数可以估计为：10 Dq =13088 cm−1，B= 453 cm −1，Dq/B=2.89和C= 2036 cm −1。与翠绿色绿色玻璃不同，深粉色微晶玻璃中没有检测到以1250 nm为中心的近红外发光。
The optical properties of Cr3+ions in lithium metasilicate (Li2O·SiO2) transparent glass–ceramics were investigated. The main crystalline phase precipitated was the lithium metasilicate (Li2O·SiO2) crystal. The percent crystallinity and crystalline size were ranging 65–75% and 20–35nm, respectively. The color changes drastically to deep pink from emerald green upon crystallization. New and strong absorption bands appeared and the absorption intensity increases by about 10 times that in glass. These new absorption bands are found to be derived from Cr3+ions in octahedral sites in the lithium metasilicate crystal lattice. Cr3+ions substitute for three Li+ions and occupy the distorted octahedral site between single [SiO4]nchains of lithium metasilicate crystal. The ligand field parameters can be estimated: 10Dq=13088 cm−1, B=453cm−1, Dq/B=2.89 and C=2036cm−1. The near-infrared luminescence centered at 1250nm was not detected in the deep pink glass–ceramics unlike emerald green glass.