کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5439131 | 1398191 | 2017 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Tuning room temperature Tp and MR of La1-y(Cay-xSrx)MnO3 polycrystalline ceramics by Sr doping
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Polycrystalline Srâdoped La1-y(Cay-xSrx)MnO3 (LCSMO, y=3/8) ceramics with x=0, y/25, 2y/25, 3y/25, 4y/25, y/3, y/2, and 2y/3 were prepared by solâgel methods. X-ray diffraction patterns results indicated that all the bulk samples were single phase without any impurities. The structure of the samples transformed from orthorhombic phase (space group of Pnma) to rhombohedral phase (space group of R3Ì
c) when the Sr content (x) was equal to or greater than y/2. With the increasing of x content, the temperature coefficient of resistance (TCR) and magnetic resistance (MR) decreased gradually. However, the metal to insulator transition temperature (Tp) and the MR reached at 300.4Â K and 12% at 300Â K for the LCSMO (x=4y/25) sample, respectively, which meant the LCSMO material could be used as a candidate for photoelectric (uncooled bolometer or infrared detectors, etc.) or magnetic devices (uncooled magnetic sensors, etc.) at room temperature. Visibly, the results indicated that the room temperature modulation of Tp and MR was observed when the site of the Ca2+ ion was substituted by the Sr2+ ion in LCSMO (y=3/8) polycrystalline ceramics. This gave rise to the increasing size of the Aâsite average cationic radius and improving of the Mn4+ ion concentration through double exchange between the Mn3+ and Mn4+ ions, leading to enhance the electrical and magnetic properties of LCSMO ceramics.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 5, 1 April 2017, Pages 4594-4598
Journal: Ceramics International - Volume 43, Issue 5, 1 April 2017, Pages 4594-4598
نویسندگان
Shuang Zhao, Xuejiao Yue, Xiang Liu,