کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7992795 | 1516149 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dielectric relaxations in pure, La-doped, and (La, Co)-codoped BiFeO3: Post-sintering annealing studies
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Dielectric relaxations in pure, La-doped, and (La, Co)-codoped BiFeO3: Post-sintering annealing studies Dielectric relaxations in pure, La-doped, and (La, Co)-codoped BiFeO3: Post-sintering annealing studies](/preview/png/7992795.png)
چکیده انگلیسی
Pure, La-doped, and (La,Co)-codoped BiFeO3 ceramic samples were prepared by solid-state reaction. By means of dielectric permittivity, electric modulus spectroscopy, and impedance analysis, the dielectric properties of the samples were systematically investigated in the temperature range of 140-330â¯K and frequency range of 20-107â¯Hz. Three, two, and one dielectric relaxations were found in pure, La-doped, and (La,Co)-codoped samples, respectively, in the investigated temperature window. Post-sintering annealing studies reveal that both p- and n-types carriers coexist in the samples with the p-type carriers (holes) being the major carriers acting as relaxing species. The dielectric properties are determined by the competition between the n-type carriers (electrons) and the holes. La-doping and (La,Co) dual doping enhance the role played by the holes. Impedance analysis shows that the low-temperature (high-frequency) relaxation is a polaronic relaxation resulting from the hoping motion of holes inside grains. The middle-temperature (frequency) and high-temperature (low-frequency) relaxations are Maxwell-Wagner relaxations caused by the hoping motion of holes blocked by grain boundaries and sample-electrode contacts, respectively. These results underscore the role of sample preparing conditions in the dielectric properties of BiFeO3 and suggest that optimizing the preparing procedures would be a promising strategy to achieve superior properties of BiFeO3.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 745, 15 May 2018, Pages 401-408
Journal: Journal of Alloys and Compounds - Volume 745, 15 May 2018, Pages 401-408
نویسندگان
Q.Q. Wang, C.C. Wang, N. Zhang, H. Wang, Y.D. Li, Q.J. Li, S.G. Huang, Y. Yu, Y.M. Guo, Z.Q. Lin,