کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5400561 | 1505912 | 2014 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optical spectroscopy of Pr3+ in the weberite, NaGdSb2O7: High covalence of Pr3+O2â bonding
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Optical spectroscopy of Pr3+ in the weberite, NaGdSb2O7: High covalence of Pr3+O2â bonding Optical spectroscopy of Pr3+ in the weberite, NaGdSb2O7: High covalence of Pr3+O2â bonding](/preview/png/5400561.png)
چکیده انگلیسی
The spectroscopic properties of the Pr3+ ion in NaGdSb2O7 are discussed in this paper. The host crystallizes in the orthorhombic weberite crystal structure with the general formula, A2B2O7. The Pr3+ luminescence is dominated by emission transitions emanating from the 1D2 state. Transient fluorescent decay of the Pr3+ luminescence is indicative of random distribution of Na+ and Gd3+ ions in NaGdSb2O7. The remarkable feature in the spectroscopic properties of the Pr3+ ion is the very low energy of the interconfiguration Pr3+ 4f2â4f15d1 excitation transition (3.63Â eV; 342Â nm). The large red shift of the Pr3+ 4f15d1 configuration is connected with significant covalent contribution to the crystal field and the high covalence of the Pr3+O2â bonding is tentatively assigned to chemical covalent bonding within the A3B tetrahedral moieties which surround the O8h2â anion in the weberite structure. A comparative study of the optical properties of Pr3+ in NaGdSb2O7 and La2Hf2O7, which crystallizes with the pyrochlore structure, is also presented.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 148, April 2014, Pages 262-266
Journal: Journal of Luminescence - Volume 148, April 2014, Pages 262-266
نویسندگان
A.M. Srivastava, S.J. Camardello, H.A. Comanzo, M. Trevisani, M. Bettinelli,