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'Electron Paramagnetic Resonance' in keywords Facet   Publication Year 1998  [X]
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1Author    C. B. Azzoni, M. C. Mozzati, A. Paleari, V. Massarotti, D. Capsoni, M. BiniRequires cookie*
 Title    Magnetic Order in Li-Mn Spinels  
 Abstract    Magnetic measurements were carried out on different samples of Lithium-Manganese spinel LiMn 2 0 4 , great care having been taken to avoid the presence of spurious magnetic phases, such as Mn 3 0 4 . Sus-ceptibility data, showing deviations from paramagnetic behaviour at about 40 K, were analyzed in terms of local magnetic interactions, taking into account the structural and transport properties of these com-pounds. The magnetic response of pure and stoichiometric samples suggests that the onset of a long-range magnetic ordering is hindered by the topological frustration of the antiferromagnetic octahedral sublattice of the spinel. 
  Reference    Z. Naturforsch. 53a, 693—698 (1998); received April 25 1998 
  Published    1998 
  Keywords    Magnetic Susceptibility, Electron Paramagnetic Resonance, Lithium Manganese Oxides, Lithium Manganese Spinel 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0693.pdf 
 Identifier    ZNA-1998-53a-0693 
 Volume    53 
2Author    C. B. Azzoni, M. C. Mozzati, A. Paleari, V. Massarotti, M. Bini, D. CapsoniRequires cookie*
 Title    Evidence of a Cationic Substitution Domain in Lithium-Manganese Spinels  
 Abstract    Magnetic susceptibility measurements and electron paramagnetic resonance spectra of samples prepared from the reactive system Mn0/Li 2 C0 3 with different starting Li cationic fraction x are analyzed, taking into account the structural and compositional information provided by x-ray diffrac-tion. Parent phases, as Mn 2 0 3 , Mn 3 0 4 and Li 2 Mn0 3 , arise together with the lithium-manganese spinel as a result of Li-deficiency or Li-excess with respect to the x = 0.33 composition pertinent to the stoichiometric LiMn 2 0 4 spinel. The data show that the spinel phase can sustain a partial Li-Mn substitution in the cation sites, according to compositional models described, for x > 0.33, by Lii +y Mnit 3y Mnf+ 2y 0 4 (Li-rich spinel) and, for x < 0.33, by Lii_| J/ |Mn^|Mn^| y |Mnfi| I/ |0 4 (Li-poor spinel). Paramagnetic resonance data of the Li-poor spinel phase are analyzed to discuss the possible oxidation state of Mn in the tetrahedral site. 
  Reference    Z. Naturforsch. 53a, 771—778 (1998); received June 22 1998 
  Published    1998 
  Keywords    Stoichiometric LiMn 2 0 4 Spinel Phase, Magnetic Susceptibility, Electron Paramagnetic Resonance 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0771.pdf 
 Identifier    ZNA-1998-53a-0771 
 Volume    53