کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5399808 | 1505906 | 2014 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Local lattice distortion induced by substitution of Si for Ge in Li2CaGe1âxSixO4 solid solutions
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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: Local lattice distortion induced by substitution of Si for Ge in Li2CaGe1âxSixO4 solid solutions Local lattice distortion induced by substitution of Si for Ge in Li2CaGe1âxSixO4 solid solutions](/preview/png/5399808.png)
چکیده انگلیسی
Possible reasons for essential differences in values of the total crystal field splitting and centroid shift of Ce3+ 5d configuration for isostructural Li2CaGeO4 and Li2CaSiO4 were analyzed by means of X-ray diffraction method and luminescent spectroscopy. It was found that the increase in Si concentration in Ce3+-doped Li2CaGe1âxSixO4 solid solutions leads to increasing of noncubic crystal field splitting parameter (â) of the Ce3+ 5d configuration, indicating to an enhancement of distortion from the cubic symmetry of the calcium dodecahedral site upon going from Li2CaGeO4 to Li2CaSiO4. The results of X-ray diffraction analysis of Li2CaGe1âxSixO4 show that the linear decrease of the unit-cell parameters with increasing Si-content is followed by complex changes in the geometry of the Ca polyhedra. Changes in the electronic structure with the composition of the solid solutions are also discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 154, October 2014, Pages 496-501
Journal: Journal of Luminescence - Volume 154, October 2014, Pages 496-501
نویسندگان
I.V. Berezovskaya, I.V. Zatovsky, I.V. Ogorodnyk, A.S. Voloshinovskii, N.P. Efryushina, V.P. Dotsenko,