Preparation and characterization of Al and B co-doped cerium containing sol–gel derived silica glasses
Preparation and characterization of Al and B co-doped cerium containing sol–gel derived silica glasses
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Al、B共掺铈溶胶-凝胶二氧化硅玻璃的制备及表征
DOI：
10.1016/s0167-577x(99)00184-6
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发表时间：
2000
影响因子：
3
通讯作者：
D. Ganguli
中科院分区：
文献类型：
--
作者：
A. Patra;G. De;D. Kundu;D. Ganguli
采用溶胶-凝胶法在1000°C下制备了含Ce玻璃。进行两个平行系列的实验，一个在氧气中，另一个在氮气气氛中，用于合成，其中平行系列的玻璃通过添加硼和铝来制备。凝胶的致密化行为进行了研究，通过物理性能测量，以及紫外-可见-近红外光谱和FTIR光谱。玻璃的吸收截止随着气氛从氧到氮的变化以及还随着硼或铝共掺杂的添加而向较短波长的偏移表明Ce 4+离子的浓度降低。这被认为是通过Ce 4+的电子俘获（导致Ce 3+的形成）和非桥氧的空穴俘获来实现的。
Glasses containing Ce were prepared by the sol–gel method at 1000°C. Two parallel series of experiments, one in oxygen and other in nitrogen atmosphere, were carried out for synthesis, where parallel series of glasses were prepared with addition of boron and aluminium. The densification behaviour of the gels has been studied by physical property measurements, as also UV–Visible–NIR and FTIR spectroscopy. The shifting of the absorption cut-off of the glasses towards shorter wavelengths with change in the atmosphere from oxygen to nitrogen and also with addition of boron or aluminium co-doping indicate that the concentration of Ce4+ions is decreased. This is proposed to take place through electron trapping by Ce4+(leading to formation of Ce3+) and hole trapping by non-bridging oxygens.