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1999 (1)
1998 (1)
1Author    C. B. Azzoni, M. C. Mozzati, A. Paleari, M. Bini, D. Capsoni, G. Chiodelli, V. MassarottiRequires cookie*
 Title    Stoichiometry Effects on the Electrical Conductivity of Lithium-Manganese Spinels  
 Abstract    The electrical conductivity of lithium-manganese spinels is analyzed in samples with different starting Li cationic fraction x. Li-rich spinels, resulting from Li-Mn substitution around the stoi-chiometric value (x= 0.333), show conductivity values higher than that observed in stoichiometric LiMn 2 0 4 . Besides, a conductivity drop, associated with a structural phase transition at about 290 K in LiMn 2 0 4 , progressively disappears by decreasing x, while it is absent in Li-rich samples. Stoi-chiometry effects on the concentration of charge carriers and on the available sites for the hopping transport process are evaluated, as well as the effects due to coexisting insulating phases. The role of the Jahn-Teller effect on the conductivity behaviour of stoichiometric and Li-poor spinels is also considered. 
  Reference    Z. Naturforsch. 54a, 579—584 (1999); received May 15 1999 
  Published    1999 
  Keywords    Electrical Conductivity, Lithium Manganese Oxides, LiMn 2 0 4 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0579.pdf 
 Identifier    ZNA-1999-54a-0579 
 Volume    54 
2Author    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