کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7744205 | 1498219 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ruddlesden-Popper phases Sr3Ni2-xAlxO7-δ and some doped derivatives: Synthesis, oxygen nonstoichiometry and electrical properties
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The Ruddlesden-Popper phases Sr3Ni2-xAlxO7-δ (0.5â¯<â¯Ñ
â¯â¤â¯0.75) were synthesized in the system Sr-Al-Ni-O for the first time. They show 2P/RS structure, in which two perovskite layers (P) are stacked in between rock-salt layers (RS). The composition Sr3Ni2-xAlxO7-δ with xâ¯=â¯0.5 was stabilized by partial substitution of Sr2+ for Ba2+ to give Sr2.8Ba0.2Ni1.5Al0.5O7-δ. This substitution allowed to reduce the synthesis duration and to lower its temperature. The study of specific electrical resistivity of Sr3Ni2-xAlxO7-δ (0.5â¯<â¯Ñ
â¯â¤â¯0.75) and Sr2.8Ba0.2Ni1.5Al0.5O7-δ (xâ¯=â¯0.5) showed that it decreased with decreasing aluminum content. The specific resistivity of yttrium-modified phases Sr2.8-yYyBa0.2Ni1.5Al0.5O7-δ was found to decrease with increasing y and reaches a minimum value for Ñâ¯=â¯0.1. Oxygen nonstoichiometry of limiting representatives in single phase range 0.5â¯<â¯xâ¯â¤â¯0.75 was estimated by iodometric titration at 20â¯Â°C, which gave the oxygen deficiency δ of 1.02 (xâ¯=â¯0.75) and 0.78 (xâ¯=â¯0.5), showing the decrease of δ with decreasing aluminum content. The temperature range of semiconductor-to-metal transition (350-450â¯Â°C) was determined by thermal analysis and electrical measurements. All synthesized compounds were analyzed by X-ray powder diffraction for identification of crystalline phases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 324, 15 October 2018, Pages 241-246
Journal: Solid State Ionics - Volume 324, 15 October 2018, Pages 241-246
نویسندگان
Inga M. Kharlamova, Leonid V. Makhnach, Alexandra E. Usenka, Alexander S. Lyakhov, Ludmila S. Ivashkevich, Vladimir V. Pankov,