کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5025248 | 1470580 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of Co2+ substitution on MgAl2O4 studied by infrared reflectance spectroscopy
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موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی (عمومی)
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چکیده انگلیسی
Infrared reflectivity spectra are measured in the frequency range between 10 and 15,500 cmâ1 at room temperature for cobalt substituted nanocrystalline magnesium aluminates MgAl2âxCoxO4 (x = 0.0, 0.5, 1.0, 1.5, 2.0). Four optical phonon modes manifesting the spinel structure have been observed and analyzed using the Lorentz oscillator model. The resonant frequency, oscillator strength and the damping factor of these modes were extracted from Lorentz oscillator fit to measured spectra. The observed reflectivity spectra exhibit a typical semiconductor behavior. Born and Szigeti effective charges have been estimated and the results are discussed to understand polarization and ionicity of MgAl2âxCoxO4 system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optik - International Journal for Light and Electron Optics - Volume 147, October 2017, Pages 180-186
Journal: Optik - International Journal for Light and Electron Optics - Volume 147, October 2017, Pages 180-186
نویسندگان
Javed Ahmad, Maria Sabir, M. Qadeer Awan, Shafiq Anwar, M. Ehsan Mazhar, R. Arif Khalil, Syed Hamad Bukhari,