| | 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 | |
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