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2000 (1)
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1Author    Y. M. Seo, S. K. Song, J. PelzpRequires cookie*
 Title    Impurity Effects on the Local Structure in the Mixed Hexachlorometallate (A 2 BC1 6 : A = K, Rb, B = Sn, Re, and Pb) Studied by the Chlorine NQR  
 Abstract    Chlorine NQR was studied for the isostructural hexachlorometallate mixed system. The study shows that Isomorphic hexachlorometallate solid solutions exhibit often impurity induced local structural order because of their relatively clear local site symmetry. This is manifested in the formation of a few satellite lines near the original resonance line and results from the random distribution of impurities on the lattice sites of the corresponding counterpart ions. Using the point charge model and a simple binomial function for the occupation probability of the guest ions on the host lattice sites, the position and the line intensity could be determined, the results of which are in good agreement with the NQR-observation. The temperature region of lattice dynamics in the crystal seems to shift in proportion to the impurity content. This fact explains the gradual change of the transition temperature in the mixed crystal between two starting materials. 
  Reference    Z. Naturforsch. 55a, 207—211 (2000); received August 23 1999 
  Published    2000 
  Keywords    NQR, Hexahalmetallates, Phase Transition, Mixed Crystals 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0207.pdf 
 Identifier    ZNA-2000-55a-0207 
 Volume    55 
2Author    Hk Müller-Buschbaum, W. SchmachtelRequires cookie*
 Title    Über Erdalkalimetalloxogallate, VI Zum Problem der Mischkristallbildung zwischen CaGa204 und CaAl204 On Alkaline Earth Metal Oxogallates, VI About Mixed Crystal Formation of CaGa204-CaAl204  
 Abstract    Mixed crystals of the formulae CaGaA104 (1) and CaGao.5Al1.5O4 (2) were investigated by X-ray single crystal work. 1 shows a tetrahedral orientation like that of CaGa 2 0 4 (monokl.), 2 another one of CaAl 2 04. A discussion of the different polyhedral arrangement of the stuffed tridymite structures is given. 
  Reference    (Z. Naturforsch. 31b, 1604—1606 [1976]; eingegangen am 2. September 1976) 
  Published    1976 
  Keywords    Aluminium, Calcium, Gallium Oxide, Mixed Crystals, X-ray 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1604.pdf 
 Identifier    ZNB-1976-31b-1604 
 Volume    31 
3Author    F. Von Woedtke, L. Kirsten, H. O. Pperm, AnnRequires cookie*
 Title    Zu den Phasenverhältnissen im System V/Nb/O, III Die Koexistenzbeziehungen der Mischkristallreihe V1_J t  
 Abstract    -NbJC 02 zu den binären und ternären Phasen der Subsysteme V 0 2/N b 02/V20 3 und V 0 2/N b 0 2/V20 5/Nb20 5 The Phase Relations in the System V /N b/O , III C oexistance R elations o f M ixed C rystals V j_ xN bxOT to the Binary and Ternary Phases o f Subsystem s V 0 2/N b 0 2/V 20 3 and V 0 2/N b 0 2/V 20 5/N b 20 5 Mixed crystals V|_^NbA0 2 exist about the whole area of quasibinary line V 0 2-N b02. The phase relations between these compositions V 0 2-N b 02 and the binary and ternary phases of the described subsystems were cleared using chemical transport reactions (CTR) and solid state reactions. A more precise phase diagram of the ternary system V/Nb/O is given for the temperature range of 900 -1000°C. 
  Reference    Z. Naturforsch. 52b, 1155—1164 (1997); eingegangen am 8. Juli 1997 
  Published    1997 
  Keywords    Vanadium Niobium Oxides, Mixed Crystals, Phase Relations, Phase Diagram 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1155.pdf 
 Identifier    ZNB-1997-52b-1155 
 Volume    52