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1999 (1)
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1Author    P. Schm, O. Bosholm, H. O. Pperm, AnnRequires cookie*
 Title    Untersuchungen zum ternären System Bi/Te/O, II. Thermisches Verhalten und Koexistenzbeziehungen von Bi20 2Te  
 Abstract    Investigations o f the Ternary System Bi/Te/O, II. The Therm al Behaviour and the R elations o f Phase C oexistences o f B i20 2Te The phase Bi20 2Te exists in the pseudobinary system Bi203/Bi2Te3. The thermal behaviour of Bi2Ö2Te was determined by DTA and X-ray analysis: The phase exists up to 620 °C and decomposes into the solid phases Bi12TeO20, Bi10Te2O 19 [1] and liquid BiTe. The relations of the phase coexistences in the pseudobinary system and in the ternary area Bi20 3/Te02/Bi2Te3/Te were investigated by solid state reactions, chemical transport reactions, and by total pressure measurements. 
  Reference    Z. Naturforsch. 52b, 1461—1466 (1997); eingegangen am 2. Oktober 1997 
  Published    1997 
  Keywords    Synthesis, Thermal Properties, Phase Diagram, Chemical Transport Reactions 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1461.pdf 
 Identifier    ZNB-1997-52b-1461 
 Volume    52 
2Author    J. Feller3, H. Oppermann3, R. Kucharkowskib, S. DäbritzcRequires cookie*
 Title    Phasenbeziehungen und Chemischer Transport der Verbindungen im ternären System Re/Mo/O Phase Relations and Chemical Transport of the Compounds in the Ternary System Re/Mo/O  
 Abstract    In the ternary system Re/Mo/O four series of mixed oxides have been prepared by heating of powder samples and by transport reactions. The series are derived from the oxides R e 0 2, M o 0 2, 7 -Mo4O u und //-Mo40 |i and have compositions R e1_ vM ov0 2 (0 < x < 0.37), M o,_> .Re>0 2 (0 < v < 0 .4 2),7 -M o 4_-| Re-| 0 11 (0 < Zj < l),a n d /7-Mo4_.2Re-^Ö |, (0 < z 2 < 1). Contributions to the understanding of the transport mechanism were obtained from thermodynamic calculations. The composition of the mixed crystals obtained have been determined by EPM A and ICP-AES. 
  Reference    Z. Naturforsch. 53b, 397—104 (1998); eingegangen am 21. Januar 1998 
  Published    1998 
  Keywords    Rhenium Molybdenum Mixed Oxides, Chemical Transport Reaction, Phase Diagram 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0397.pdf 
 Identifier    ZNB-1998-53b-0397 
 Volume    53 
3Author    J. Feller1, H. Oppermann, M. Binnewiesb, E. MilkebRequires cookie*
 Title    On the Chemical Transport o f Rhenium and Rhenium Oxides  
 Abstract    Synthesis and single crystal growth by chemical transport reactions o f rhenium and rhenium oxides is reported. Several transport agents like the mercury halides H gC l2, HgBr2, H g l2, tellurium tetrachloride and iodine have been employed the transport o f the rhenium compounds. Mass spectrometric experiments gave informations about the composition o f the gas phase. The transport reactions were traced by calculations based on the knowledge o f the gas phase species and their thermodynamical data. 
  Reference    Z. Naturforsch. 53b, 184—190 (1998); eingegangen am 7. November 1997 
  Published    1998 
  Keywords    Chemical Transport Reaction, Rhenium Oxides, Thermodynamic Calculation, Mass Spectra 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0184.pdf 
 Identifier    ZNB-1998-53b-0184 
 Volume    53 
4Author    Snte, PbteO. Bosholm, H. OppermannRequires cookie*
 Title    Untersuchungen zum chemischen Transport intermetallischer Phasen, I: GeTe, SnTe, PbTe Investigations on the Chemical Transport of Intermetallic Phases, I: GeTe  
 Abstract    GeTe, SnTe, and PbTe have been prepared by chemical transport reactions with iodine as transport agent in the temperature range between T2 (800 -700 °C) and T , (700 -500 °C). The effective transport equilibria were determineted. Total pressure measurements in the system Ge-Te-I give the coexistence equlibria for condensed phases, and also for the gasphase equilibra. GeTe4 exists only as a metastable phase at lower temperatures and decom poses near 260 °C in GeTe and Te. Thermodynamic calculations show satisfactory agreement between calculation and experi­ ment. 
  Reference    Z. Naturforsch. 54b, 737 (1999); eingegangen am 26. Februar 1999 
  Published    1999 
  Keywords    Chemical Transport Reactions, Total Pressure Measurement, Calculation o f CTR, Thermodynamic Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0737.pdf 
 Identifier    ZNB-1999-54b-0737 
 Volume    54 
5Author    Oppermann, S. Herrera, DaoQuoc HuongRequires cookie*
 Title    Untersuchungen zum chemischen Transport von YX3 mit A1X3 und zur Existenz von gasförmigen und festen Komplexen YA13 X12 (X = Br, I) Investigations on the Chemical Transport Reaction of YX3 with A1X3 and on the Existence of Gaseous and Solid Complexes YA13 X 12 (X = Br, I) H  
 Abstract    The dominant gaseous complexes YAl3B r12 and YA13I 12 were generated in the chemical trans­ port reactions of YBr3 with AlBr3 and YI3 with A1I3. The enthalpy of formation Z\H£(YAl3B r12,gi298) = -484,5 ± 6 kcal/mol and the standard entropy S°(YA13B 12 g 298) = 290,0 ± 7,5 cal/K mol have been calculated. It follows from total pressure measurements of mixtures of YBr3 s with AlBr3 1 and YI3 s with A1I3 b respectively, that complexes YAl3B r12 s and YA13I 12 s do not exist up to the boiling points of the aluminium trihalides. 
  Reference    Z. Naturforsch. 53b, 361—366 (1998); eingegangen am 1. Dezember 1997 
  Published    1998 
  Keywords    Chemical Transport Reaction, Yttrium Aluminium Halides, Enthalpy of Formation, Standard Entropy, Total Pressure Measurements 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0361.pdf 
 Identifier    ZNB-1998-53b-0361 
 Volume    53 
6Author    H. Oppermann, B. MarkleinRequires cookie*
 Abstract    The heterogeneous reactions: 0 s 0 4 s = 0 s 0 4 g, 2 0 s 0 2,s = Oss + 0 s 0 4 g, Oss + 3 0 s 0 4 g = 4 0 s 0 3 g, 0 s 0 2s + 0 s 0 4 g = 2 0 s 0 3 g and the homogeneous reaction 0 s 0 4 " = 0 s 0 3 g + '/2 0 2 g were determined by total pressure measurements. From this and from chemical transport reactions of 0 s 0 2 and Os with Osmium tetroxide, the enthalpy of formation of gaseous 0 s 0 3 was computed to Z\H ß(0s03 g i98) = -40,0 ± 3 kcal/mol. 
  Reference    Z. Naturforsch. 53b, 1352—1364 (1998); eingegangen am 3. Juli 1998 
  Published    1998 
  Keywords    Osmium Oxides, Chemical Transport Reactions, Total Pressure Measurements, Enthalpy of Formation, Standard Entropy 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1352.pdf 
 Identifier    ZNB-1998-53b-1352 
 Volume    53