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1996 (1)
1980 (1)
1Author    Hans Georg, Schnering, Manfred WittmannRequires cookie*
 Title    Europium(II)heptaphosphid E11P7 [1]  
 Abstract    The novel polyphosphide EuP7 was prepared under controlled conditions by the reaction of the elements in salt melts at 750-800 K. EuP7 forms black prismatic crystals not attacked by diluted mineral acids and bases. The thermal decomposition yields EuP3 at 700 K and in further steps EuP2, EU3P4 and EuP, respectively. According to the crystal structure as well as the electrical, optical and magnetic properties EuP7 is a semiconductor (EG = 0.9 eV; EG (vert) = 1.1 eV) with divalent europium (y — 7.55 B.M.). The compound crystallizes in the monoclinic space group P2i/n with a — 1148.8(7) pm, b — 570.0(3) pm, c = 1061.0(6) pm, and ß= 106.08°(5); (X-ray diffraction data; 1479 hkl-, R = 0.031). The P-atoms are connected (P-P) = 218.0-223.5 pm) to a 2-dimensional infinite polyanionic structure ^(P? 2 -) with homonuclear 3-bonded and 2-bonded P-atoms in the ratio 5:2. The polyanionic network contains Pß-rings (chair conformation) as well as Ps-rings and P10-rings. The Eu-atoms are bonded to 9 P-atoms (1,4,4-polyhedra) with bond distances ranging from 306.6 to 326.6 pm. The Eu-atoms complete the tetrahedral environment of the P-atoms. 
  Reference    Z. Naturforsch. 35b, 824—831 (1980); eingegangen am 13. März 1980 
  Published    1980 
  Keywords    Rare Earth Metal Polyphosphide, Preparation, Structure, Physical Properties 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0824.pdf 
 Identifier    ZNB-1980-35b-0824 
 Volume    35 
2Author    Hristoph Linke, M. Artin, JansenRequires cookie*
 Abstract    Ag8Ge3O 10 was obtained from a mixture of the binary oxides by solid state reaction in the presence of a small amount of water which is acting as an accelerator. Conditions applied were T = 500 °C and p (0 2) = 1,2 kbar. According to an X-ray crystal structure analysis the title compound contains four crystallographically independent trigermanate [Ge3O 10]8-ions per unit cell (Pc, a = 12.1549(11), b = 10.7375(14), c = 18.5169(20) Ä, ß = 92.326(10)°, 13448 independent reflections, R 1 = 6 ,1 %, wR2 = 13,0%, Z = 8). Thermal decomposition, as recorded by DTA and temperature dependent Guinier photographs, occurs at 520 °C. Ag8Ge3O ,0 is diamagnetic with a molar susceptibility of -330-10" cm3 mol" 1. Darstellung, Kristallstruktur und physikalische Eigenschaften von Oktasilbertrigermanat, Ag8Ge3O10 
  Reference    Z. Naturforsch. 51b, 1591—1597 (1996); eingegangen am 18. April 1996 
  Published    1996 
  Keywords    Octasilver Trigermanate, High Oxygen Pressure Synthesis, Crystal Structure, Physical Properties 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1591.pdf 
 Identifier    ZNB-1996-51b-1591 
 Volume    51