TITLE

Relationship between the surface chemical states and magnetic properties of CeO2 nanoparticles

AUTHOR(S)
Li, Mingjie; Ge, Shihui; Qiao, Wen; Zhang, Li; Zuo, Yalu; Yan, Shiming
PUB. DATE
April 2009
SOURCE
Applied Physics Letters;4/13/2009, Vol. 94 Issue 15, p152511
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Hydrogen reduction treatments with variations in isothermal reduction temperature, duration, and partial pressure of hydrogen (PH2) are carried out on CeO2 nanoparticles (NPs) to investigate the relationship between the surface chemical states and magnetic properties of the samples. The phenomenon of surface reduction degree dependence of the ferromagnetism of CeO2 NPs is observed. Semiquantitative calculated concentrations of surface Ce3+ ions from x-ray photoelectron spectroscopy data demonstrate that ferromagnetism does not relate to the surface oxygen vacancies but to the surface Ce3+/Ce4+ pairs. The higher the number of surface Ce3+/Ce4+ pairs, the more robust the ferromagnetism appears.
ACCESSION #
37831795

 

Related Articles

  • Shape-influenced magnetic properties of CoO nanoparticles. Kundu, Subrata; Nelson, A.; McCall, S.; Buuren, Tony; Liang, Hong // Journal of Nanoparticle Research;May2013, Vol. 15 Issue 5, p1 

    Using a wet chemical approach, CoO nanospheres, nanorings, nanoflowers, and nanowires of different sizes were generated. Among those, nanorings show ferromagnetic behavior below 6 K while the nanospheres remain paramagnetic. X-ray photoelectron spectroscopy for Co 2p, 3p, and 3s core-levels...

  • Study on the oxygen vacancy redistribution and the mechanism of electrical manipulation of ferromagnetism in diluted magnetic oxides. Shuxia Ren; Jingyu Dong; Wei Chen; Liyong Zhang; Jiajun Guo; Li Zhang; Jing Zhao; Xu Zhao // Journal of Applied Physics;2015, Vol. 118 Issue 23, p233902-1 

    Electrical manipulation of room temperature ferromagnetism (RTFM) has been observed in several kinds of transition metal doped diluted magnetic oxide films. We demonstrate using X-ray photoelectron spectroscopy that the redistribution of the oxygen vacancies in a film under an electric field...

  • Spatially resolved measurements of the ferromagnetic phase transition by ac-susceptibility investigations with x-ray photoelectron emission microscope. Römer, F. M.; Kronast, F.; Heyne, L.; Hassel, C.; Banholzer, A.; Kläui, M.; Meckenstock, R.; Lindner, J.; Farle, M. // Applied Physics Letters;3/22/2010, Vol. 96 Issue 12, p122501 

    Spatially resolved ac susceptibility measurements on epitaxial Fe films are performed as a function of temperature using a conventional soft-x-ray photoelectron emission microscope. A magnetic contrast is observed at sample locations where the magnetic film undergoes a para/ferromagnetic phase...

  • Preparation of Mn-doped BaTiO3 nanoparticles and their magnetic properties. Tong, Xiaoran; Lin, Yuan-Hua; Zhang, Songyin; Wang, Yao; Nan, Ce-Wen // Journal of Applied Physics;Sep2008, Vol. 104 Issue 6, p066108 

    Mn-doped BaTiO3 nanoparticles have been synthesized using a hydrothermal method. Phase composition, microstructure, and Raman spectroscopy analysis indicate that a double-phase structure containing both cubic and tetragonal structures can be obtained. Electron paramagnetic resonance and x-ray...

  • Synthesis and Characterization of Dendrimer-Encapsulated Iron and Iron-Oxide Nanoparticles. Baykal, A.; Toprak, M.; Durmus, Z.; Senel, M.; Sozeri, H.; Demir, A. // Journal of Superconductivity & Novel Magnetism;Jul2012, Vol. 25 Issue 5, p1541 

    In this paper, a series of iron (Fe) containing nanoparticles were prepared by employing PAMAM (Poly(amidoamine), dendrimers with different generations (G0-G3) as templates and sodium borohydride as a reducing agent. The products have been characterized by TEM, FT-IR, XRD, VSM, TGA, and XPS. XRD...

  • Enhanced hydrogenation and reduced lattice distortion in size selected Pd-Ag and Pd-Cu alloy nanoparticles. Sengar, Saurabh K.; Mehta, B. R.; Kulriya, P. K.; Khan, S. A. // Applied Physics Letters;10/21/2013, Vol. 103 Issue 17, p173107 

    Important correlation between valence band spectra and hydrogenation properties in Pd alloy nanoparticles is established by studying the properties of size selected and monocrystalline Pd, Ag, Cu, Pd-Ag, and Pd-Cu nanoparticles. The X-ray photoelectron spectroscopy and elastic recoil detection...

  • Oxygen vacancy enhanced room temperature magnetism in Al-doped MgO nanoparticles. Mishra, Debabrata; Mandal, Balaji P.; Mukherjee, Rupam; Naik, Ratna; Lawes, Gavin; Nadgorny, Boris // Applied Physics Letters;5/6/2013, Vol. 102 Issue 18, p182404 

    We have measured the room temperature magnetization in Al-substituted magnesium oxide, Mg(Al)O nanoparticles with Al fractions of up to 5 at. %. All samples, including undoped MgO nanoparticles, exhibit weak room temperature ferromagnetism, with the saturation magnetization reaching a maximum of...

  • Investigating thermal stability of structural defects and its effect on d0 ferromagnetism in undoped SnO2. Kamble, Vinayak B.; Bhat, S. V.; Umarji, A. M. // Journal of Applied Physics;Jun2013, Vol. 113 Issue 24, p244307 

    The effect of annealing on structural defects and d0 ferromagnetism in SnO2 nanoparticles prepared by solution combustion method is investigated. The as-synthesized SnO2 nanoparticles were annealed at 400-800 °C for 2 h, in ambient conditions. The crystallinity, size, and morphology of the...

  • Observation of room temperature ferromagnetism in pure LaO nanoparticles. Xu, Qiang; Gao, Daqiang; Zhang, Jing; Yang, Zhaolong; Zhang, Zhipeng; Rao, Jinwei; Xue, Desheng // Applied Physics A: Materials Science & Processing;Sep2014, Vol. 116 Issue 3, p1293 

    In this paper, we report the observation of intrinsic room temperature ferromagnetism in pure LaO nanoparticles. Magnetism measurement indicates that all of the samples exhibit room temperature ferromagnetism and the saturation magnetization for the samples decreases with the increase in...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics