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1987 (1)
1Author    Wolfgang Hönle, Arndt Simon, Gabriele GerlachRequires cookie*
 Title    Darstellung, Kristallstruktur und Eigenschaften von ß-Ga 2 Br 4 Preparation, Crystal Structure and Properties of y3-Ga 2 Br 4  
 Abstract    The compounds Ga 2 Br 4 (a+ß) have been prepared by reacting GaBr 3 with Ga metal without a solvent or in a hydrocarbon medium. a-Ga 2 Br 4 is isotypic with Ga 2 Cl 4 , and /3-Ga 2 Br 4 with Ga 2 I 4 . Both forms have to be formulated as Ga + (GaBr 4)~ according to their crystal structures. The first order phase transition a—*ß has been investigated by means of DTA and temperature dependent X-ray powder photographs. The crystal structure of /3-Ga 2 Br 4 has been refined with single crystal data (R3c; a = 2163.4(8) pm; c = 869.2(4) pm; Z = 18; R = 0.037). Main building units are GaBr 4 " tetrahedra (d(Ga —Br) = 232.9 pm), connected in three dimensions by capped trigonal prisms (6+2+1) around Ga + . The crystal chemical relationships between y3-Ga 2 Br 4 and Ga 2 I 4 are discussed. 
  Reference    Z. Naturforsch. 42b, 546 (1987); eingegangen am 13. November 1986 
  Published    1987 
  Keywords    Phase Transition, DTA Investigation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0546.pdf 
 Identifier    ZNB-1987-42b-0546 
 Volume    42