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1996 (2)
1994 (1)
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1Author    Peter Rögner, Klaus-Jürgen RangeRequires cookie*
 Title    Strukturverfeinerung von Rubidiumperrhenat bei 297 und 159 K Structure Refinement of Rubidium Perrhenate at 297 and 159 K  
 Abstract    The scheelite-type structure of rubidium per­ rhenate, R b R e 0 4, has been confirmed and refined from single-crystal X-ray data at two tempera­ tures. The com pound crystallizes tetragonally, space group I4,/a, with a = 5,8401(5), c = 13,265(2) A at 297(1) K, and a = 5,8289(7), c = 13,109(2) A at 159(3) K, respectively. Except for a significant decrease in the anisotropic displace­ ment factors, the changes in the structural para­ meters at low temperature are rather small. Im Zusam m enhang mit unseren Untersuchun­ gen zu tem peraturinduzierten Phasenumwandlun­ 
  Reference    Z. Naturforsch. 48b, 233—234 (1993); eingegangen am 30. September 1992 
  Published    1993 
  Keywords    Rubidium Perrhenate, Structure Refinement, Scheelite-Type Structure 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0233_n.pdf 
 Identifier    ZNB-1993-48b-0233_n 
 Volume    48 
2Author    Danita De, W. Aal, *. Klaus-Jürgen, R. AnRequires cookie*
 Title    Structure Refinem ent o f Potassium Periodate at 297 and 150 K  
 Abstract    The scheelitetype structure of potassium perio­ date, K I 0 4, has been confirmed and refined from single-crystal X-ray data at two temperatures. The compound crystallizes tetragonally, space group 14,/a, with a = 5.726(1), c = 12.607(4) Ä at 297(1) K, and a = 5.704(3), c = 12.478(8) A at 150(1) K, respectively. Except for a significant decrease in the anisotropic displacement factors, the changes in the structural parameters at low temperature are rather small. 
  Reference    Z. Naturforsch. 51b, 444—446 (1996); eingegangen am 4. August 1995 
  Published    1996 
  Keywords    Potassium Periodate, Structure Refinement, Scheelite-Type Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0444_n.pdf 
 Identifier    ZNB-1996-51b-0444_n 
 Volume    51 
3Author    D.Anita De, W. Aal, K. Laus-Jürgen, RangeRequires cookie*
 Title    Structure R efinem en t o f Rubidium P eriodate at 297 and 150 K  
 Abstract    The scheelite-type structure of rubidium perio­ date, R b I0 4, has been confirmed and refined from single-crystal X-ray data at two temper­ atures. The compound crystallizes tetragonally, 
  Reference    Z. Naturforsch. 51b, 1365—1367 (1996); received March 18 1996 
  Published    1996 
  Keywords    Rubidium Periodate, Structure Refinement, Scheelite-Type Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1365_n.pdf 
 Identifier    ZNB-1996-51b-1365_n 
 Volume    51 
4Author    J.-Ch Buhl, C. Mundus, J. Löns, W. HoffmannRequires cookie*
 Title    On the Enclathration of N aB(O H )4 in the /J-Cages of Sodalite: Crystallization Kinetics and Crystal Structure  
 Abstract    The hydrothermal formation of sodium hydroxyborate enclathrated sodalite synthesized from an initial ternary mixture of mullite, cristobalite and corundum has been investigated. Depending on temperature and pressure the compound Na7-5[AlSi04]6[B(0H)4]1.5 • 2 H 20 could be synthesized in form of polycrystalline powder as well as in form of single crystals. The kinetics of the sodalite growth could be determined at 423 K and 473 K. 29Si-and 27A1 MAS NMR was shown to be the preferred method to describe the conversion into sodalite quantitatively. Evidence for the first formation of polycrystalline sodalite has been found after the total dissolution of mullite and cristobalite. Single crystal X-ray diffraction data were used for the structure determination and refinement. The position and orientation of the hydroxyborate anions within the sodalite's /J-cages could only be found in the course of a "rigid body" refinement with constraints for the B(OH)4 tetrahedron. The boron atoms are located in an off-centre position within the sodalite cages. One out of the four oxygen atoms of the hydroxyborate group is positioned near the centre of a face of the sodium tetrahedron, whereas the three remaining oxygen atoms are near to the middle of its edges. 
  Reference    Z. Naturforsch. 49a, 1171—1178 (1994); received September 26 1994 
  Published    1994 
  Keywords    Sodalite solid solution, Crystallization kinetics, IR-spectroscopy, MAS NMR, Structure refinement 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1171.pdf 
 Identifier    ZNA-1994-49a-1171 
 Volume    49