| | 1 | Author
| U. Petasch, C. Hennig, H. Oppermann | Requires cookie* | | | Title
| U  | | | | Abstract
| n te r s u c h u n g e n z u m q u a s ib in ä r e n S y s te m B i2T e3 /B iC l3 Investigations on the Pseudobinary System Bi2Te3/BiCl3 The phase diagram of the pseudobinary sytem Bi2Te3/BiCl3 was investigated by DTA, total pressure measurements, and X-ray phase analysis. Only BiTeCl exists as a ternary phase in this system. The compound melts incongruently at 430 °C. The heat of formation and the standard entropy of BiTeCl were calculated from vapor pressure data: AH°b (BiTeCl, f, 298) = (-39,5 ± 1,6) kcal/mol; S° (BiTeCl, f, 298) = (34,4 ± 2,7) cal/K mol. The heat of formation of BiCl3 was determined on the basis of the heat of solution of BiCl3 and Bi20 3, and the heat of formation of Bi20 3: z\Hß (BiCl3, f, 298) = (-95,9 ± 0,9) kcal/mol. | | | |
Reference
| Z. Naturforsch. 54b, 234—238 (1999); eingegangen am 9. Oktober 1998 | | | |
Published
| 1999 | | | |
Keywords
| Bismuth Telluride Chloride, Phase Diagram, Total Pressure Measurements, Calorimetry, Thermodynamic Data | | | |
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| default:Reihe_B/54/ZNB-1999-54b-0234.pdf | | | | Identifier
| ZNB-1999-54b-0234 | | | | Volume
| 54 | |
| 2 | Author
| U. Petasch, H. Oppermann | Requires cookie* | | | Title
| Untersuchungen zum quasibinären System Bi2Te3/BiBr3 Investigations on the Pseudobinary System Bi-,Te3/BiBr3 | | | | Abstract
| The phase diagram of the pseudobinary sytem Bi2Te3/BiBr3 was investigated by DTA, total pressure measurements and X-ray phase analysis. Only BiTeBr exists as a ternary phase in this system. The compound melts congruently at 526 °C. The heat of formation and standard entropy were calculated from vapor pressure data: Z\H(BiTeBr, f, 298) = (-30,4 ± 1,4) kcal/mol; S°(BiTeBr, f, 298) = (36,2±2,9) cal/K mol. | | | |
Reference
| Z. Naturforsch. 54b, 487—190 (1999); eingegangen am 15. Januar 1999 | | | |
Published
| 1999 | | | |
Keywords
| Bismuth Telluride Bromide, Phase Diagram, Barogram, Total Pressure Measurements, Thermodynamic Data | | | |
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| default:Reihe_B/54/ZNB-1999-54b-0487.pdf | | | | Identifier
| ZNB-1999-54b-0487 | | | | Volume
| 54 | |
| 3 | Author
| Snte, PbteO. Bosholm, H. Oppermann | Requires 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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| default:Reihe_B/54/ZNB-1999-54b-0737.pdf | | | | Identifier
| ZNB-1999-54b-0737 | | | | Volume
| 54 | |
| 4 | Author
| Oppermann, S. Herrera, DaoQuoc Huong | Requires 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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| default:Reihe_B/53/ZNB-1998-53b-0361.pdf | | | | Identifier
| ZNB-1998-53b-0361 | | | | Volume
| 53 | |
| 5 | Author
| H. Oppermann, B. Marklein | Requires cookie* | | | Title
| | | | | 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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| default:Reihe_B/53/ZNB-1998-53b-1352.pdf | | | | Identifier
| ZNB-1998-53b-1352 | | | | Volume
| 53 | |
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