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1994 (1)
1Author    N. E. Ainbinderl, G. A. Volgina, E. A. Kravchenko, A. N. Osipenko, \.A A Gippius, SuanHai Fam, A. A. Bush3Requires cookie*
 Title    209Bi N Q R Powder Spectra Influenced by Local and Applied Magnetic Fields  
 Abstract    Several experimental techniques have shown evidence for the existence of internal magnetic fields of the order of 200 G in oc-Bi20 3 [1]. The asymmetrical 209Bi N Q R lineshapes in Bi30 4Br also point to a source of poorly resolved splitting present in this compound. In order to obtain further insight into the origin of the local magnetic fields in these compounds the 209Bi N Q R lineshapes of polycrystalline a-Bi20 3 and Bi30 4Br were recorded in weak (below 500 G) static magnetic fields. A calculation of the expected powder lineshapes in a-Bi20 3 under the influence of the internal and applied magnetic fields up to 1 kG was made. The results of the computer simulation are compared with the lineshapes recorded. From the 209Bi lineshapes ob­ served in the experiment, the local magnetic field at one of the two Bi-sites in Bi30 4Br was estimated. 
  Reference    Z. Naturforsch. 49a, 425—432 (1994); received December 15 1993 
  Published    1994 
  Keywords    209Bi N Q R, Internal magnetic field, Lineshape, Applied magnetic field, Computer simulation 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0425.pdf 
 Identifier    ZNA-1994-49a-0425 
 Volume    49 
2Author    E. A. Kravchenko, V. G. Orlov, SuanHai Fam, YuF. KarginRequires cookie*
 Title    Bi NQR and Magnetic Properties of Bismuth Oxide-Based Compounds  
 Abstract    The NQR line shapes of 209 Bi in the a-Bi 2 0 3 -based mixed oxides Bi 2 0 3 • 2M 2 0 3 (M = Al, Ga). Bi 2 0 3 • 3Ge0 2 , and 2Bi 2 0 3 • 3Ge0 2 are recorded in zero and weak magnetic fields (// ext < 500 Oe) and compared with the results of computer simulation. Splittings and line shape asymmetry, exhibited by the resonances, suggest that internal magnetic fields, similar to those earlier reported for a-Bi 2 0 3 and Bi 3 0 4 Br, may exist in these compounds. In the spectra of single crystal Bi 4 Ge 3 0 12 , the line multiplicity in external magnetic fields is higher than simulated, which might results from domains in the crystal. In external magnetic fields a notable increase in the line intensity was observed, the effect depend-ing on the mutual orientation of the EFG axes and the fields perturbing the nuclear spin system. 
  Reference    Z. Naturforsch. 53a, 504—513 (1998); received January 26 1998 
  Published    1998 
  Keywords    209 Bi NQR, Internal Magnetic Field, Line Shape, Applied Magnetic Field, Computer Simulation 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0504.pdf 
 Identifier    ZNA-1998-53a-0504 
 Volume    53