کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10713957 | 1025561 | 2012 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effects of Cr-doping on the room temperature ferromagnetism of chemically synthesized CeO2âδ nanoparticles
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
We report an investigation of the nature of room-temperature ferromagnetism enhancement in Ce1âxCrxO2âδ nanoparticles (0.00â¤xâ¤0.05), synthesized by a sol-gel-based method. Energy-dispersed X-ray spectrometry (EDS) analysis was used to estimate the dopant concentrations. The average crystallite sizes and particle size were estimated by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. Both studies showed a gradual decrease in the size of the crystallites and particles for x>0.01. Cr can substitute for Ce in the crystal lattice, and the Raman measurements indicated that structural defects in the samples increased as a function of the Cr content in the CeO2 crystal lattice. The surface topography, examined by scanning electron microscopy (SEM), showed that the undoped sample has a porous and loosely organized structure, whereas the Cr-doped samples exhibited a dense and compact structure. Magnetic measurements of the Ce1âxCrxO2âδ samples at 27 oC showed a maximum remanent magnetization value of 0.01 emu/g for x=0.05. The nature and enhancement of room-temperature ferromagnetism was interpreted by taking into account the exchange interaction between Cr3+ ions and oxygen vacancies in CeO2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 407, Issue 16, 15 August 2012, Pages 3218-3221
Journal: Physica B: Condensed Matter - Volume 407, Issue 16, 15 August 2012, Pages 3218-3221
نویسندگان
N.S. Ferreira, L.G. Abraçado, M.A. Macêdo,