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'magnesium' in keywords Facet   Publication Year 2001  [X]
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1Author    Ratikanta Mishra, Rolf-Dieter Hoffmann, Rainer PöttgenRequires cookie*
 Title    New Magnesium Compounds /fcE2Cu2Mg (RE = Y, La -Nd, Sm, Gd -Tm, Lu) with Mo2FeB2 Type Structure  
 Abstract    The title compounds were synthesized by reaction of the elements in sealed tantalum tubes in a water-cooled sample chamber in a high-frequency furnace. These magnesium intermetallics crystallize with the tetragonal Mo2FeB2 type structure, space group PMmbm. The lattice pa­ rameters of all compounds were refined from X-ray powder data. Single crystal X-ray data yielded a = 792.09(6), c = 396.31(8) pm, wR2 = 0.0396, 315 F 2 values for La2Cu2Mg, a = 778.30(5), c = 384.04(5) pm, wR2 = 0.0954, 214 F 2 values for Nd2Cu2Mg, and a = 762.65(5), c = 374.09(3) pm, wR2 = 0.0566, 186 F 2 values for Y2Cu2Mg with 12 variable parameters for each refinement. The /?£, 2Cu2Mg structures can be described as an intergrowth of distorted A1B2 and CsCl related slabs of compositions RECui and REMg. Chemical bonding in La2Cu2Mg was investigated on the basis of extended Hückel calculations and compared to isotypic La2Cu2ln. This structure was also refined from single crystal X-ray data: PMmbm, a = 780.8(2), c = 400.1(2) pm, wR2 = 0.0351, 211 F 2 values and 12 variable parameters. 
  Reference    Z. Naturforsch. 56b, 239—244 (2001); received January 25 2001 
  Published    2001 
  Keywords    Intermetallic Compounds, Magnesium, Crystal Structure 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0239.pdf 
 Identifier    ZNB-2001-56b-0239 
 Volume    56 
2Author    Comet Gmbh, Pyrotechnik ApparatebauRequires cookie*
 Title    Fluoreliminierung aus Graphitfluorid mit Magnesium Defluorination of Graphite Fluoride Applying Magnesium Emst-Christian Koch  
 Abstract    Consolidated stoichiometric mixtures of graphite fluoride (1) and magnesium (2) upon igni­ tion under argon atmosphere (0,1 MPa) yield very high flame temperature of ~ 5600 K as determined by infrared emission spectroscopy. The combustion product was analysed by X-ray powder diffraction and revealed the presence of magnesium fluoride and graphite as well as structurally low ordered carbon. A possible reaction mechanism is discussed. 
  Reference    Z. Naturforsch. 56b, 512—516 (2001); eingegangen am 5. März 2001 
  Published    2001 
  Keywords    Graphite Fluoride, Defluorination, Magnesium 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0512.pdf 
 Identifier    ZNB-2001-56b-0512 
 Volume    56