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2001 (1)
1997 (1)
1Author    C. H. Och, C. R.Requires cookie*
 Title    Alkalimetall-Oxosilicate A6[Si30 9] und A 6[Si20 7] (A = Rb, Cs): Darstellung und Kristallstruktur  
 Abstract    The A lkaline M etal O xo-Silicates A 6[Si30 9] and A 6[Si20 7] (A = Rb, Cs): P rep aratio n and Crystal Structure The title compounds were synthesized via reaction of quartz and A 0 2 (A = Rb, Cs) with the elem ental alkali metals. Their crystal structures were determ ined on the basis o f single crystal X-ray data. A ll compounds crystallize in the m onoclinic system with space group P2j/c and lattice constants a = 656.0(l)/684.7(3), b = 1329.7(3)/1375.7(4), c = 1647.6(3)/1703.6(8) pm, ß = 107.78(3)/108.23(2)°, Z = 4 (A 6[Si30 9], A = Rb/Cs) and a = 668.59(8)/711.4(1), b = 911.37(9)/952.1(2), c = 1121.09(9)/1192.7(7) pm, ß = 125.52(9)/126.22(3)°, Z = 2 (A 6[Si20 7], A = Rb/Cs) respectively. The rubidium and cesium compounds are isotypic with the corre­ sponding potassium silicates. 
  Reference    Z. Naturforsch. 56b, 423 (2001); eingegangen am 8. Februar 2001 
  Published    2001 
  Keywords    Silicates, Disilicates, Cyclotrisilicates 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0423.pdf 
 Identifier    ZNB-2001-56b-0423 
 Volume    56 
2Author    Pb2ln2si209, J.-P Werner, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Kenntnis eines synthetischen Kentrolits/Melanotekits des Indiums: On an Synthetic Kentrolite/Melanotekite of Indium: Pb2In2Si20 9  
 Abstract    Single crystals of Pb2In2Si20 9 have been prepared by crystallisation from melts of Pb(N 03)2, ln20 3 and S i0 2. The compound crystallizes with orthorhombic symmetry, space group C2v-Pna2| with the lattice constants a = 10.529(1),/?= 11.372(1) and c = 7.019(3) A, Z = 4. Despite the fact that the Kentrolite/Melanotekite structure is characterized by dissimilar occupied split positions of lead, Pb2In2Si20 9 shows completely filled and ordered point positions. The location of a dot like lone pair of Pb~+ is estimated by Coulomb term calculations of lattice energy. The results are discussed with respect to published Pb-lone pair distances using the electronic polarizability coefficient of the lone pair cation or simple geometrical considerations. 
  Reference    Z. Naturforsch. 52b, 1213—1218 (1997); eingegangen am 8. Juli 1997 
  Published    1997 
  Keywords    Lead, Indium, Silicate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1213.pdf 
 Identifier    ZNB-1997-52b-1213 
 Volume    52