کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7990117 | 1516126 | 2018 | 54 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Role of Gd-doping in conduction mechanism of BFO-PZO nanocrystalline composites: Experimental and first-principles 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: Role of Gd-doping in conduction mechanism of BFO-PZO nanocrystalline composites: Experimental and first-principles studies Role of Gd-doping in conduction mechanism of BFO-PZO nanocrystalline composites: Experimental and first-principles studies](/preview/png/7990117.png)
چکیده انگلیسی
In this paper, in the conduction behaviour of Gd-doped 0.4BiGdxFe(1-x)O3-0.6PbZrO3 (BFO-PZO) with xâ¯=â¯0.0, 0.05, 0.10, 0.15, 0.20 composites, synthesized by solid-state reaction (mixed oxide) technique, was investigated. X-ray diffraction study with Rietveld refinement method revealed the formation of rhombohedral (R3c) phase. Dielectric constant and dielectric loss studies as a function of frequency reveal dispersion due to Maxwell-Wagner type of interfacial polarization while weak ferroelectric hysteresis loops have been recorded for all the samples. Complex impedance spectroscopy technique-based impedance, electrical modulus, and electrical conductivity of the composites revealed non-Debye type relaxation mechanism. Correlated barrier hopping (CBH) mechanism dominates in all the composites exhibiting high value of density of states (1023â¯eVâ1â¯cmâ1) which increased further after doping with Gd. It was seen that doping of Gd affects the activation energy of these composites which was complemented by performing density functional theory calculations. Bader charge calculation was performed to understand the chemical environment and charge transfer upon doping. In addition, a small change in the bandgap was found which may cause the change in activation energy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 768, 5 November 2018, Pages 198-213
Journal: Journal of Alloys and Compounds - Volume 768, 5 November 2018, Pages 198-213
نویسندگان
Ambika Ray, Tanmoy Basu, Banarji Behera, Mathan Kumar, Ranjit Thapa, Pratibindhya Nayak,