Wikipedia

Neodymium(III) sulfate

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.

Neodymium(III) sulfate[1]
Several dozen pink, similar-sized rectangular crystals
Neodymium sulfate crystals
Names
IUPAC name
Neodymium(III) trisulfate
Other names
  • Neodyous sulfate
  • Neodymium sulfate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.225 Edit this at Wikidata
EC Number
  • 233-262-1
UNII
  • 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
  • [O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Nd+3].[Nd+3]
Properties
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)
8 g/100 ml (20 °C)
Solubility Soluble in sulfuric acid
Structure[2]
Monoclinic
C2/c
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:
GHS07: Exclamation mark
H315, H319, H335
P261, P280, P304, P305+P351+P338, P340, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 0: Will not burn. E.g. waterInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
1
0
1
Flash point Not flammable
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).

Preparation

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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

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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

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  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.
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