کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9761774 | 1498428 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electric conductions in La0.9Sr0.1GaO3âδ and La0.9Sr0.1Ga0.9Mg0.1O3âδ
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Electric conductions in La0.9Sr0.1Ga1âxMgxO3âδ (LSGM; x=0 and 0.1) have been elucidated by ac and dc methods as a function of temperature. Using complex-plane impedance analyses and dielectric relaxation processes along with dc results, activation energy for electric conduction, migration energy of O2â ions (EM), and energy required to create a free mobile oxygen vacancy which assists O2â migration (EO) within intragrains and in boundaries have been obtained separately. Dielectric dispersion due to a distribution of relaxation times in boundaries is observed. The activation energy for each electric conduction is nearly equal to sum of EM and EO. Lattice distortion due to a large difference in ionic radii of Mg2+ and Ga3+ brings about high migration energy within intragrains in x=0.1 specimen compared with that of x=0. Such high migration energy has an adverse effect on improvement of ionic conductivities but excess oxygen vacancies compensate this adverse effect. In boundaries, disturbances in coulombic potential fields due to disordered ionic arrangements discourage ionic conductions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 176, Issues 3â4, 31 January 2005, Pages 245-251
Journal: Solid State Ionics - Volume 176, Issues 3â4, 31 January 2005, Pages 245-251
نویسندگان
M. Kurumada, H. Hara, F. Munakata, E. Iguchi,