Holmium (III) fluoride
Crystal structure | ||||||||||||||||
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__ Ho 3+ __ F - | ||||||||||||||||
Crystal system | ||||||||||||||||
Space group |
Pnma (No. 62) |
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General | ||||||||||||||||
Surname | Holmium (III) fluoride | |||||||||||||||
other names |
Holmium trifluoride |
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Ratio formula | HoF 3 | |||||||||||||||
Brief description |
yellowish powder |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 221.93 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
7.64 g cm −3 |
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Melting point |
1143 ° C |
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boiling point |
> 2200 ° C |
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solubility |
almost insoluble in water |
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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 . |
Holmium (III) fluoride is an inorganic chemical compound of holmium from the group of fluorides .
Extraction and presentation
Holmium (III) fluoride can be obtained by reacting ammonium fluoride with holmium (III) oxide and thermal decomposition of the ammonium salt formed.
properties
Holmium (III) fluoride is a yellowish powder that is insoluble in water. It has an orthorhombic crystal system (corresponding to beta- yttrium (III) fluoride ) with the space group Pnma (space group no. 62) . However, there is also a trigonal low-temperature form of the lanthanum (III) fluoride type.
Individual evidence
- ↑ a b c d e f Americanelements: Holmium Fluoride
- ↑ a b Materion: Materion Advanced Chemicals Inc. ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ↑ a b data sheet holmium (III) fluoride at AlfaAesar, accessed on August 30, 2012 ( PDF )(JavaScript required) .
- ↑ a b c data sheet Holmium (III) fluoride, anhydrous, powder, 99.99% trace metals basis from Sigma-Aldrich , accessed on August 19, 2012 ( PDF ).
- ^ Karl A. Gschneidner, Jean-Claude G. Bünzli: Handbook on the Physics and Chemistry of Rare Earths . Elsevier, 2003, ISBN 0-444-51323-X , pp. 202 ( limited preview in Google Book search).
- ^ A b Christoph Janiak, Hans-Jürgen Meyer, Dietrich Gudat, Ralf Alsfasser: Riedel Modern Inorganic Chemistry . Walter de Gruyter, 2012, ISBN 3-11-024901-4 , p. 371 ( limited preview in Google Book search).
- ↑ Boris Petrovich Sobolev: The Rare Earth Trifluorides: Introduction to materials science of ... Institut d'Estudis Catalans, 2001, ISBN 84-7283-610-X , p. 176 ( limited preview in Google Book search).
- ^ Jean D'Ans, Ellen Lax: Pocket book for chemists and physicists . Springer DE, 1997, ISBN 3-540-60035-3 , pp. 488 ( limited preview in Google Book search).