کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10632064 | 992382 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and characterization of Mg2B2O5
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Magnesium borate of the form Mg2B2O5 has been prepared and its structural and thermal properties were studied using X-ray diffraction and differential thermal analysis. An investigation of the electrical and optical properties of Mg2B2O5 system has been carried out. The electrical resistivity of the sample was measured in the temperature range of 170-400Â K. The data analysis revealed an extrinsic nature of the conductivity with two impurity levels located at 0.13 and 0.71Â eV in the temperature ranges of 170-230Â K and 240-400Â K, respectively. The optical transmission and reflection was recorded at 300Â K in the incident photon energy range of 3.0-6.0Â eV. The absorption coefficient data analysis revealed an indirect optical energy band gap of 4.73Â eV. In addition, two impurity levels located at 3.43, and 4.49Â eV were observed in the absorption spectra.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 40, Issue 4, 20 April 2005, Pages 583-589
Journal: Materials Research Bulletin - Volume 40, Issue 4, 20 April 2005, Pages 583-589
نویسندگان
A.F. Qasrawi, T.S. Kayed, A. Mergen, M. Gürü,