کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9761811 | 1498429 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The system Al2O3 and (Sr,Mg)-doped LaGaO3: phase composition and electrical properties
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Mixtures of α-Al2O3 and La0.8Sr0.2Ga0.8Mg0.2O3âδ, with α-Al2O3 concentrations ranging from 1 to 20 wt.%, were uniaxially and isostatically pressed and finally sintered at 1500 °C for 4 h. The phase composition and microstructure were investigated by X-ray powder diffraction and scanning electron microscopy techniques. The electrical properties were studied by complex impedance spectroscopy in a wide range of temperatures (200-800 °C) in air. In the sintered bodies pure α-Al2O3 was not detected; the partial substitution of Al for Ga was suggested entailing the formation of the solid solutions of perovskite-type (La0.8Sr0.2)(Ga1âxâyAlxMgy)O3âδ and La0.8Sr0.2Ga1âxAlxO3âδ. α-Al2O3 added to La0.8Sr0.2Ga0.8Mg0.2O3âδ inhibited the grain growth of the majority phase. Under isothermal conditions, the electrical conductivity decreases with increasing alumina content, while the activation energies increase.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 176, Issues 1â2, 14 January 2005, Pages 81-88
Journal: Solid State Ionics - Volume 176, Issues 1â2, 14 January 2005, Pages 81-88
نویسندگان
I. Natali Sora, R. Pelosato, G. Dotelli, C. Schmid, R. Ruffo, C.M. Mari,