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1995 (1)
1990 (1)
1Author    D. Siebert, R. Miller, S. Fiechter, P. Dulski, A. HartmannRequires cookie*
 Title    An EPR Investigation of Cr 3+ and Ni 2 + in Synthetic Pyrite Crystals  
 Abstract    In many synthetic pyrite single crystals of high quality and purity we could detect Cr 3 + and Ni 2 + by EPR at 78 K as unwanted impurities. The assignment was possible by means of the isotopes Cr 53 and Ni 61 , occurring in natural abundance. The paramagnetic centers exhibit unusual g-values. In case of Ni 2+ a ligand hyperfine interaction could be observed beside the normal hyperfine interaction with the Ni 61 nucleus. For some crystals the Cr 3+ signal intensity could be increased up to ten times by temperature increasement from 78 K to about 100 K. At 78 K the Cr 3+ intensity was quenched by IR irradiation. 
  Reference    Z. Naturforsch. 45a, 1267—1272 (1990); received August 4 1990 
  Published    1990 
  Keywords    Pyrite, EPR, Paramagnetic ions, Conductivity 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-1267.pdf 
 Identifier    ZNA-1990-45a-1267 
 Volume    45 
2Author    M. Schüler, J. Dahlem, D. SiebertRequires cookie*
 Title    E P R I  
 Abstract    n v e s tig a tio n o f S y n th e tic , D o p e d F e S 2 a n d R u S 2 S in g le C r y s ta ls . Synthetic FeS2 and RuS2 single crystals were prepared by the flux method using PbCl2, bismut, and tellurium as different solvents. FeS2 and some RuS2 samples were doped with elementary vanadium, other RuS2 crystals with manganese and nickel. The EPR spectra revealed Mn2+ in the low-spin state and Ni2+. The lineshape of the Mn sextet turned out to be asymmetrical. In some RuS2 samples we detected an isotropic structureless rather narrow signal with a linewidth down to 0.05 mT and attributed it to the conductivity. Its lineshape becomes symmetrical and Lorentzian by grinding the samples to a polycrystalline powder. The EPR parameters of appropriate spin-Hamiltonians were determined. The intensities of the allowed and forbidden lines depended very differently on the microwave power due to different degrees of saturation. 
  Reference    Z. Naturforsch. 50a, 1159—1164 (1995); received October 17 1995 
  Published    1995 
  Keywords    FeS2, RuS2, EPR, paramagnetic ions, conductivity 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-1159.pdf 
 Identifier    ZNA-1995-50a-1159 
 Volume    50