Gamma-induced absorption spectra as a new method for RE-ion environment study in fluorophosphate glasses

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• 作者：T.V. Bocharova ; G.O. Karapetyan ; A.M. Mironov ; V.D. Khalilev and N.O. Tagil’ ; tseva
• 刊名：Optical Materials
• 出版年：2006
• 期刊代码：81_09253467
• 类别：ch
• 出版时间：August 2006
• 卷：28
• 期：11
• 页码：1296-1300
• 文件大小：242 K

摘要

Doped fluorophosphate glasses based on pseudo-binary system: barium metaphosphate Ba(PO₃)₂– usovite MgCaSrBaAl₂F₁₄, are studied by means of fluorescence, induced ESR and optical absorption spectra. Doping the glass, containing 5 and 7 mol%Ba(PO₃)₂ with TbF₃ and EuF₃ results in drastic changes of color and paramagnetic center numbers correspondingly. Post-irradiation process results in separation of the spectra analyzed into groups in dependence of Tb³⁺ ion concentration. The crucial concentration, dividing two concentration ranges is not more than 0.02 mol%. It is supposed that the local environment of Tb³⁺ ion doped up to concentration mentioned is preferably phosphate. Estimates of Eu³⁺ ion concentration that have preferably phosphate groupings in their environment result from concentration dependence of centers and produce the value of approximately 0.01 mol%. Close values of two crucial concentrations is interpreted in terms of doped ion segregation model.