کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10638219 | 995413 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystal orientation dependence of the optical bandgap of (1 â x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 single crystals
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The transmission spectra of rhombohedral 0.71Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 (PMN-0.29PT) and tetragonal PMN-0.38PT single crystals were obtained in the main crystallographic directions ã0Â 0Â 1ã, ã1Â 1Â 0ã and ã1Â 1Â 1ã. The absorption coefficients were computed and the optical bandgaps were calculated in both direct and indirect transitions. The energy of phonons contributing in the indirect transition was also calculated. For PMN-0.38PT single crystal in all the three directions, the values of direct bandgaps Egd are all slightly lower than those of PMN-0.29PT single crystal, while the indirect bandgaps Egi are all higher. For different crystallographic directions, the values of Egi for ã1Â 1Â 0ã-direction are lower compared with ã0Â 0Â 1ã and ã1Â 1Â 1ã directions, both for PMN-0.29PT and PMN-0.38PT single crystals. Some discussions about the B-site cation d-orbits and the O-anion 2p orbits that determine the basic energy level of the single crystals are presented. The optical transition mechanism was also discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 92, Issue 1, 15 July 2005, Pages 123-127
Journal: Materials Chemistry and Physics - Volume 92, Issue 1, 15 July 2005, Pages 123-127
نویسندگان
Xinming Wan, Xiangyong Zhao, H.L.W. Chan, C.L. Choy, Haosu Luo,