کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7907898 | 1510760 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Luminescence of Mn4+ ions in CaTiO3 and MgTiO3 perovskites: Relationship of experimental spectroscopic data and crystal field calculations
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Luminescence of Mn4+ ions in CaTiO3 and MgTiO3 perovskites: Relationship of experimental spectroscopic data and crystal field calculations Luminescence of Mn4+ ions in CaTiO3 and MgTiO3 perovskites: Relationship of experimental spectroscopic data and crystal field calculations](/preview/png/7907898.png)
چکیده انگلیسی
Herein, the synthesis, structural and crystal field analysis and optical spectroscopy of Mn4+ doped metal titanates ATiO3 (A = Ca, Mg) are presented. Materials of desired phase were prepared by molten salt assisted sol-gel method in the powder form. Crystallographic data of samples were obtained by refinement of X-ray diffraction measurements. From experimental excitation and emission spectra and structural data, crystal field parameters and energy levels of Mn4+ in CaTiO3 and MgTiO3 were calculated by the exchange charge model of crystal-field theory. It is found that crystalline field strength is lower (Dq = 1831 cmâ1) in the rhombohedral Ilmenite MgTiO3 structure due to the relatively longer average Mn4+O2â bond distance (2.059 Ã
), and higher (Dq = 2017 cmâ1) in orthorhombic CaTiO3 which possess shorter average Mn4+O2â bond distance (1.956 Ã
). Spectral positions of the Mn4+2Eg â 4A2g transition maxima is 709 nm in MgTiO3 and 717 nm in CaTiO3 respectively in good agreement with calculated values.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 74, December 2017, Pages 46-51
Journal: Optical Materials - Volume 74, December 2017, Pages 46-51
نویسندگان
Vesna ÄorÄeviÄ, Mikhail G. Brik, Alok M. Srivastava, Mina MediÄ, Predrag VuliÄ, Estelle Glais, Bruno Viana, Miroslav D. DramiÄanin,