Praseodymium (III) sulfide
General | |||||||||||||||||||
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Surname | Praseodymium (III) sulfide | ||||||||||||||||||
other names |
Dipraseodymium trisulfide |
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Molecular formula | Pr 2 S 3 | ||||||||||||||||||
Brief description |
green solid |
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properties | |||||||||||||||||||
Molar mass | 378.01 g mol −1 | ||||||||||||||||||
Physical state |
firmly |
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density |
5.1 g cm −3 |
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Melting point |
1765 ° C |
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safety instructions | |||||||||||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Praseodymium (III) sulfide is an inorganic chemical compound from the group of sulfides .
Extraction and presentation
Praseodymium (III) sulfide can be obtained by reacting praseodymium (III) oxide with hydrogen sulfide .
It is also possible to display it by reacting elementary praseodymium with sulfur in an evacuated glass tube which is placed in a 2-zone oven. The zone temperatures are 400 ° C and 100 ° C. After all the sulfur has reacted, the ampoule is tempered at 1000 ° C and the compound is obtained in polycrystalline form:
Rod-shaped single crystals up to 1 cm long can be obtained by modifying the synthesis from the elements. For this purpose, in addition to praseodymium and sulfur, elemental iodine is added to the ampoule to be evacuated. In the 2-zone furnace, the primary product is now produced . If the compound obtained is heated in the ampoule to 1100 to 1200 ° C and held there for at least 20 hours, the compound decomposes and praseodymium (III) sulfide single crystals grow in a melt of praseodymium (III) iodide . After opening the ampoule, adhering iodide to the single crystals can be rinsed off with water or a water-ethanol mixture:
properties
Praseodymium (III) sulfide is a green solid (as a γ modification). The compound comes in three modifications. The α-form has an orthorhombic crystal structure with the space group Pnma (space group no. 62) , the β-form has a tetragonal crystal structure with the space group I 4 1 / acd (no. 142) and the γ-form has a cubic crystal structure with the Space group I 4 3 d (No. 220) . The compound decomposes at 1650 ° C in vacuo, forming the monosulphide.
Individual evidence
- ^ A b c Edwin B. Faulkner, Russell J. Schwartz: High Performance Pigments . John Wiley & Sons, 2009, ISBN 3-527-62692-1 , pp. 28 ( limited preview in Google Book search).
- ^ A b William M. Haynes: CRC Handbook of Chemistry and Physics, 93rd Edition . CRC Press, 2012, ISBN 1-4398-8049-2 , pp. 4–84 ( limited preview in Google Book Search).
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
- ↑ Georg Brauer , with the collaboration of Marianne Baudler a . a. (Ed.): Handbook of Preparative Inorganic Chemistry . 3rd, revised edition. tape I . Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , pp. 1098 .
- ^ A b A. W. Sleight and DP Kelly: Rare-earth sesquisulfides, Ln 2 S 3 . In: Aaron Wold and John K. Ruff (Eds.): Inorganic Syntheses . tape 14 . McGraw-Hill Book Company, Inc., 1973, ISBN 07-071320-0 ( defective ) , p. 152-155 (English).
- ↑ JB Goodenough, A. Hamnett, G. Huber, F. Hullinger, M. Leiß, SK Ramasesha, H. Werheit: Physics of Non-Tetrahedrally Bonded Binary Compounds III / Physik Der nicht ... Springer, 1984, ISBN 3- 540-12744-5 , pp. 332 ( limited preview in Google Book search).
- ↑ G. Meyer, Lester R. Morss: Synthesis of Lanthanide and Actinide Compounds . Springer, 1991, ISBN 0-7923-1018-7 , pp. 335 ( limited preview in Google Book search).