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'Electron Paramagnetic Resonance' in keywords Facet   section ZfN Section A  [X]
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1999 (1)
1998 (2)
1991 (1)
1Author    B. Karabulut, R. Tapramaz, A. BulutRequires cookie*
 Title    EPR Studies of Cu 2+ in dl-Aspartic Acid Single Crystals  
 Abstract    EPR studies of Cu 2+ doped dl-Aspartic Acid [NH 2 CH(CH 2 COOH)COO] powder and single crystal have been carried out at 113 and 300 K. The principal hyperfine and g values, covalancy parameter, mixing coefficients and Fermi-contact term of the complex were obtained, and the ground-state wavefuntion of the Cu 2+ ion in the lattice has been constructed. 
  Reference    Z. Naturforsch. 54a, 256—260 (1999); received January 11 1999 
  Published    1999 
  Keywords    Electron Paramagnetic Resonance, dl-Aspartic Acid, Amino Acid 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0256.pdf 
 Identifier    ZNA-1999-54a-0256 
 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 
3Author    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 
4Author    A. B. Vassilikou-Dova, K. EftaxiasRequires cookie*
 Abstract    In clear, blue, transparent bipyramidal crystals of the rare mineral benitoite, BaTiSi30 9, para­ magnetic defects have been investigated by electron paramagnetic resonance at room temperature and 9.43 GHz. They are attributed to Sn3+ and Fe3 + . A pair of satellites recorded for a wide angular rage around B0 || c (~40°) and a relative intensity of ~ 13% to the central signal is most likely due to hyperfine interaction with 117Sn and 119Sn isotopes. Attempts to bleach the colour of the crystal were unsuccessful. 
  Reference    Z. Naturforsch. 46a, 579—582 (1991); received February 18 1991 
  Published    1991 
  Keywords    Electron paramagnetic resonance, Radiation defects, Minerals, Sn3 +, Fe3 + 
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 TEI-XML for    default:Reihe_A/46/ZNA-1991-46a-0579.pdf 
 Identifier    ZNA-1991-46a-0579 
 Volume    46