Wikipedia

Samarium(III) nitrate

Samarium(III) nitrate is an odorless, white-colored chemical compound with the formula Sm(NO3)3. It forms the hexahydrate, which decomposes at 50°C to the anhydrous form. When further heated to 420°C, it is converted to the oxynitrate, and at 680°C it decomposes to form samarium(III) oxide.[2]

Samarium(III) nitrate
Names
Other names
  • Samarium trinitrate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.713 Edit this at Wikidata
EC Number
  • 233-798-6
  • InChI=1S/3NO3.6H2O.Sm/c3*2-1(3)4;;;;;;;/h;;;6*1H2;/q3*-1;;;;;;;+3
  • [Sm+3].[H]O[H].[H]O[H].[H]O[H].[H]O[H].[H]O[H].[H]O[H].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O
Properties
Sm(NO3)3
Molar mass 336.4 g/mol
Appearance Slightly brown crystals
Odor Odorless
Melting point 78 °C (172 °F; 351 K)[1]
Boiling point 420 °C (788 °F; 693 K)[2] (decomposition)
Soluble[1]
Hazards
GHS labelling:
GHS03: OxidizingGHS05: CorrosiveGHS07: Exclamation markGHS09: Environmental hazard
Danger
H272, H315, H318, H319, H335, H410
P210, P220, P221, P261, P264, P271, P273, P280, P302+P352, P304+P340, P305+P351+P338, P310, P312, P321, P332+P313, P337+P313, P362, P370+P378, P391, P403+P233, 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 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorusSpecial hazards (white): no code
1
0
2
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Synthesis

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Samarium(III) nitrate is produced by the reaction of samarium hydroxide and nitric acid:[citation needed]

Sm(OH)3 + 3HNO3 → Sm(NO3)3 + 3H2O

Uses

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Samarium(III) nitrate is a lewis acid catalyst that is used to produce a nitrate precursor solution that is used as a nanocatalyst in the solid oxide regenerative fuel cells. The nanocatalyst is made by mixing samarium(III) nitrate hexahydrate, strontium nitrate, and cobalt(II) nitrate hexahydrate.[3]

Samarium(III) nitrate is also used for the preparation of samarium doped ceria, which can be used in the fabrication of electrolytes for fuel cells. The samarium doped ceria is produced by mixing cerium(III) nitrate and samarium(III) nitrate together using triethylene glycol as a solvent for 5 hours at 200°C. Then it was dried for 4 hours at 110°C which resulted in a brown solid. Then it was heated up to 500°C for two hours which made the samarium doped ceria.[4]

References

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  1. ^ a b "Samarium Nitrate". ESPI Metals. Retrieved 9 August 2021.
  2. ^ a b Roy L. Wilfong; Louis P. Domingues; LeRoy R. Furlong (1962). Thermal Decomposition of Five Salts of Praseodymium, Neodymium, and Samarium. U.S. Department of the Interior, Bureau of Mines. p. 13.
  3. ^ K. J. Yoon; J. Hong; H. Kim; J. -W. Son; J. -H. Lee; B. –K. Kim. "M. Faruk O¨ ksu¨zo¨mer". High Temperature Energy Materials Research Center Korea Institute of Science and Technology, Seoul 136-791, South Korea: 2. doi:10.1149/06801.3261ecst. {{cite journal}}: Cite journal requires |journal= (help)
  4. ^ Tuba Karaca; Tuba Gu¨rkaynak Altınc¸ekic; M. Faruk O¨ ksu¨zo¨mer (2010). "Synthesis of Nanocrystalline Samarium-Doped CeO2 (SDC) Powders As a Solid Electrolyte By Using a Simple Solvothermal Route". Istanbul University, Faculty of Engineering, Department of Chemical Engineering: 2. doi:10.1149/06801.3261ecst. {{cite journal}}: Cite journal requires |journal= (help)
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