sulfat.JPG) | |
| Names | |
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| IUPAC name Neodymium(III) trisulfate | |
Other names
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| ChemSpider | |
| ECHA InfoCard | 100.030.225 
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| EC Number |
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| PubChem CID | |
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| CompTox Dashboard (EPA) | |
InChI
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SMILES
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| Properties | |
| Chemical formula | Nd2(SO4)3 |
| Molar mass | 576.7 g/mol |
| Appearance | Pink crystals |
| Density | 2.85 g/cm |
| Melting point | 700 °C (1,292 °F; 973 K) |
| Solubility in water | 8 g/100 ml (20 °C) |
| Solubility | Soluble in sulfuric acid |
| Structure | |
| Crystal structure | Monoclinic |
| Space group | C2/c |
| Lattice constant | a = 13.76 Å, b = 7.20 Å, c = 18.65 Å |
| Explosive data | |
| Shock sensitivity | Not explosive |
| Friction sensitivity | Not explosive |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
| Main hazards | Irritant |
| GHS labelling: | |
| Pictograms | 
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| Hazard statements | H315, H319, H335 |
| Precautionary statements | P261, P280, P304, P305+P351+P338, P340, P405, P501 |
| NFPA 704 (fire diamond) |
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| Flash point | Not flammable |
| Autoignition temperature |
Not flammable |
| Related compounds | |
| Other anions | Neodymium nitrate |
| Other cations | Praseodymium(III) sulfate |
| Related compounds | Neodymium sulfate octahydrate |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references | |
Neodymium(III) sulfate is a salt of the rare-earth metal neodymium that has the formula Nd2(SO4)3. It forms multiple hydrates, the octa-, penta-, and the dihydrate, which the octahydrate is the most common. This compound has a retrograde solubility, unlike other compounds, its solubility decreases with increasing temperature. This compound is used in glass for extremely powerful lasers.
Preparation
Neodymium sulfate is produced by dissolving neodymium(III) oxide in sulfuric acid:
- Nd2O3 + 3 H2SO4 → Nd2(SO4)3 + 3 H2O
It can also be prepared by the reaction of neodymium(III) perchlorate and sodium sulfate.
Properties
Neodymium sulfate octahydrate decomposes at 40 °C to the pentahydrate, which in turn decomposes to the dihydrate at 145 °C. The dihydrate dehydrates to the anhydrous form at 290 °C.
References
- "Neodymium Sulfate | 13477-91-3".
- Donald R. Fitzwater; R. E. Rundle (1952). Structure of Neodymium Sulfate Octahydrate. University of Minnesota: Ames Laboratory, Iowa State College.
- Art. A. Migdisov; V. V. Reukov; A. E. Williams-Jones (2005). "A spectrophotometric study of neodymium(III) complexation in sulfate solutions at elevated temperatures". Geochimica et Cosmochimica Acta. 70 (4): 983–992. doi:10.1016/j.gca.2005.11.001.
- Wendlandt, W W (1958). "The thermal decomposition of yttrium and the rare earth metal sulphate hydrates". J. Inorg. & Nuclear Chem. 7 (1–2): 51–54. doi:10.1016/0022-1902(58)80026-3.
| Neodymium compounds | |
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| Nd(II) | |
| Nd(III) | |
| Nd(IV) | |