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1998 (1)
1996 (1)
1Author    M. Bionducci, F. Buffa, G. Licheri, G. Navarra, B. Bouchet-Fabre, J. M. TonnerreRequires cookie*
 Title    Determination of the Partial Structure Factors of Amorphous CuZr by Anomalous X-Ray Scattering and Reverse Monte Carlo  
 Abstract    Anomalous X-ray Scattering experiments have been performed to study the local order in an amorphous CuZr sample prepared by mechanical alloying. The three partial structure factors were extracted both using a regularization algorithm to solve an ill-conditioned system of linear equations and applying the reverse Monte Carlo technique to the experimental data. Then the short range atomic distributions of similar samples prepared by different methods and investigated by different techniques are compared. 
  Reference    Z. Naturforsch. 51a, 71—82 (1996); received November 15 1995 
  Published    1996 
  Keywords    Amorphous Alloys, Anomalous X-ray Scattering, Regularization Algorithm, Reverse Monte Carlo, Partial Structure Factors 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0071.pdf 
 Identifier    ZNA-1996-51a-0071 
 Volume    51 
2Author    Uwe Hoppe, Günter Walter, Rainer Kranold, Dörte StachelRequires cookie*
 Title    An X-ray Diffraction Study of the Structure of Vitreous P2O5  
 Abstract    Recently, the lengths of the two P-0 bonds in the P0 4 tetrahedron were obtained by neutron diffrac-tion of high real-space resolution. By use of the present X-ray diffraction experiments, the P-P distance belonging to pairs of corner-linked P0 4 units is determined. Using this length of (294 ± 2) pm and tak-ing into account the P-0 bond distance to the bridging oxygen atom of 158 pm, a mean P-O-P angle of 137° ± 3° is calculated. The reverse Monte Carlo simulations fit the neutron and X-ray structure fac-tors. The P-O-P angle distribution obtained this way possesses a mean angle of 141°. An interpretation of the first scattering peaks is presented by analysing the occupancy and the distances of various co-ordination shells by use of model configurations. The low occupancy of the first shells allows the ap-plication of the schematic hole model of Dixmier. The first X-ray diffraction peak at 13 nra" 1 is related to the P-P2nd shell, the shoulder at 20 nm -1 arises from the P-0 2nd shell. The most similar crystalline structure with vitreous P2O5 is the orthorhombic P2O5, form II. But it has more effectively orientated terminal oxygen atoms and, thus, a higher packing than the glass. 
  Reference    Z. Naturforsch. 53a, 93—104 (1998); received December 22 1997 
  Published    1998 
  Keywords    Vitreous P 2 0 5, X-ray Diffraction, Short-range Order, Reverse Monte Carlo 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0093.pdf 
 Identifier    ZNA-1998-53a-0093 
 Volume    53