Synthesis and spectroscopic properties of (Cr 4+) doped sol-gels
Synthesis and spectroscopic properties of (Cr 4+) doped sol-gels
复制标题
(Cr 4 )掺杂溶胶-凝胶的合成及光谱性质
DOI：
10.1016/0022-3093(96)00336-5
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发表时间：
1996
影响因子：
3.5
通讯作者：
R. Alfano
中科院分区：
文献类型：
--
作者：
P. Devi;H. Gafney;V. Petričević;R. Alfano
采用低温溶胶-凝胶法制备了Cr ~（4+）掺杂的多元凝胶和橄榄石基陶瓷粉体。虽然吸收光谱表明四面体配位的Cr 4+的存在下，在硅酸盐-铝酸盐和锗酸盐玻璃，没有表现出近红外发射在室温下。Cr（III）掺杂的Mg 2SiO 4、Ca 2GeO 4和铝酸盐MAlO 2（M = Li、Na和K）产生具有指示八面体配位的Cr（III）的吸收光谱的透明材料。加热这些透明材料产生粉末，其表现出四面体配位的Cr（IV）的吸收和近红外发射光谱特征。
The low temperature sol-gel process has been used for the preparation of Cr4-doped multicomponent gels and olivine group ceramic powders. Although absorption spectra indicate the presence of tetrahedrally coordinated Cr4+in the silicate-aluminate and germanate glasses, none exhibit near-IR emissions at room temperature. Cr(III) doping of Mg2SiO4, Ca2GeO4and the aluminates MAlO2(M = Li, Na and K) yield transparent materials with absorption spectra indicative of octahedrally coordinated Cr(III). Heating these transparent materials produces powders that exhibit absorption and near-IR emissions spectra characteristic of tetrahedrally coordinated Cr(IV).