کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5460187 | 1516193 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Comparative study of magnetic and optical properties of Bi0.95La0.05Fe0.8M0.2O3 (MÂ =Â Cr, Co, Al) ceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Bi0.95La0.05Fe0.8M0.2O3 (MÂ =Â Cr, Co, Al) ceramics have been prepared by high pressure synthesis and their structure, magnetic, thermal, and optical properties have been investigated. X-ray diffraction suggests the pure phase formation with rhombohedral structure in all samples. The structural distortion induced by dopants is further analyzed by Raman spectra. The SEM investigation reveals that Cr and Al substitution does not affect the morphologies of Bi0.95La0.05FeO3 ceramics, while Co substitution significantly reduces the grain sizes and uniforms the morphology. The effect of substitution on the magnetic properties of Bi0.95La0.05FeO3 is different depending on M due to different mechanisms. More interestingly, Co substitution induces a change in the spin structure from a cycloidal space modulated spin structure to a collinear G-type antiferromagnetic structure, which results in obviously enhanced magnetization at room temperature. Optical studies show a sharp absorption in the visible region for all samples. The band gap values of Bi0.95La0.05FeO3 and Bi0.95La0.05Fe0.8M0.2O3 ceramics with MÂ =Â Cr, Co, and Al are estimated to be 2.30, 2.06, 2.12 and 2.27Â eV, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 701, 15 April 2017, Pages 170-176
Journal: Journal of Alloys and Compounds - Volume 701, 15 April 2017, Pages 170-176
نویسندگان
Xingquan Zhang, Chunmei Zhang, Ruishi Xie, Baogang Guo, Hailong Hu, Guohua Ma,