Neodymium(III) sulfate

Neodymium(III) sulfate ^[1]

Octahydrate
Names
IUPAC name Neodymium(III) trisulfate
Other names Neodyous sulfate Neodymium sulfate
Identifiers
CAS Number	10101-95-8
3D model (JSmol)	Interactive image
ChemSpider	21241399
ECHA InfoCard	100.030.225
EC Number	233-262-1
PubChem CID	165814
UNII	4Q1946CN7K
CompTox Dashboard (EPA)	DTXSID00890625
InChI InChI=1S/2Nd.3H2O4S/c;;3*1-5(2,3)4/h;;3*(H2,1,2,3,4)/q2*+3;;;/p-6 Key: OJSWEKSDNUORPG-UHFFFAOYSA-H
SMILES [O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Nd+3].[Nd+3]
Properties
Chemical formula	Nd2(SO4)3
Molar mass	576.7 g/mol
Appearance	Pink crystals
Density	2.85 g/cm3
Melting point	700 °C (1,292 °F; 973 K)
Solubility in water	8 g/100 ml (20 °C)
Solubility	Soluble in sulfuric acid
Structure [2]
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
Hazard statements	H315, H319, H335
Precautionary statements	P261, P280, P304, P305+P351+P338, P340, P405, P501
NFPA 704 (fire diamond)	1 0 1
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 [77 °F], 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. ^[3] 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. ^[4]

References

1. "Neodymium Sulfate | 13477-91-3".
2. Donald R. Fitzwater; R. E. Rundle (1952). Structure of Neodymium Sulfate Octahydrate. University of Minnesota: Ames Laboratory, Iowa State College.
3. 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.
4. 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.