Mn-substituted cerium oxide nanostructures and their magnetic properties

Journal Article · Wed Aug 15 00:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.04.008· OSTI ID:22804088

Alla, S. K. ^[1]; Kollu, P. ^[2]; Meena, Sher Singh ^[3]; Poswal, H. K.; Mandal, R. K.

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1. Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi, 221005 (India)
2. Department of Physics, University of Hyderabad, Hyderabad, 500046 (India)
3. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085 (India)

Highlights: • Mn{sub x}Ce{sub 1-x}O{sub 2} (0.1 ≤ x ≤ 0.5) nanostructures were prepared by one step microwave refluxing method. • The saturation magnetization values for the samples rose with increased Mn content. • The oxygen vacancies inherently played crucial role in increasing the magnetization values. - Abstract: In this study, we report the magnetic properties of nanostructured Mn{sub x}Ce{sub 1-x}O{sub 2} (0 0.1 ≤ x ≤ 0.5) materials, synthesized via microwave refluxing technique. Phase purity of the samples was investigated using the structural characterization techniques such as X-ray diffraction (XRD) and transmission electron microscopy (TEM). These analyses indicated the substitution of Ce-ions with Mn-ions in the lattice. The progressive increase in the oxygen vacancies with increased dopant concentration was demonstrated by Raman, UV–vis and photoluminescence spectroscopic studies. X-ray photoelectron spectroscopy analysis further supported the presence of Mn{sup 2+}, Ce{sup 3+} and Ce{sup 4+} ions as well as oxygen vacancies in the samples. The Mn substituted CeO{sub 2} nanostructures were found to exhibit room temperature ferromagnetism (RTFM). There was a continuous improvement in the saturation magnetization (M{sub S}) values with increased Mn concentration. This might be due to the prevalence of surface oxygen vacancies and the systematic rise in their concentration with increased dopant content.

• OSTI ID: 22804088
• Journal Information: Materials Research Bulletin, Vol. 104; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
CERIUM IONS
CERIUM OXIDES
CONCENTRATION RATIO
DOPED MATERIALS
FERROMAGNETISM
MAGNETIC PROPERTIES
MAGNETIZATION
MANGANESE IONS
MICROWAVE RADIATION
NANOSTRUCTURES
OXYGEN
PHOTOLUMINESCENCE
RAMAN SPECTROSCOPY
TEMPERATURE RANGE 0273-0400 K
TRANSMISSION ELECTRON MICROSCOPY
VACANCIES
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY