Samarium Elemental Symbol
Samarium



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Samarium Samarium Samario Samário Samario Samarium

Elemental Samarium PictureSamarium is a Block F, Group 3, Period 6 element. Samarium Bohr ModelThe number of electrons in each of Samarium's shells is 2, 8, 18, 24, 8, 2 and its electron configuration is [Xe]4f6 6s2. The samarium atom has a radius of 180.pm and it's Van der Waals radius is 229.pm. In its elemental form, CAS 7440-19-9, samarium has a silvery-white appearance. Samarium was discovered and first isolated by Lecoq de Boisbaudran in 1879. It is named after the mineral samarskite.

Samarium is primarily utilized in the production of samarium-cobalt (Sm2Co17) permanent magnets. It is also used in laser applications and for its dielectric properties. Samarium-cobalt magnets replaced the more expensive platinum-cobalt magnets in the early 1970s. While now overshadowed by the less expensive neodymium-iron-boron magnet, they are still valued for their ability to function at high temperatures. They are utilized in lightweight electronic equipment where size or space is a limiting factor and where functionality at high temperature is a concern. Applications include electronic watches, aeospace equipment, microwave technology and servomotors. Samarium is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity). High Purity (99.999%) Samarium Oxide (Sm2O3)Powder Elemental or metallic forms include pellets, rod, wire and granules for evaporation source material purposes. High Purity (99.999%) Samarium (Sm) Sputtering Target Samarium nanoparticles and nanopowders provide ultra-high surface area which nanotechnology research and recent experiments demonstrate function to create new and unique properties and benefits. Oxides are available in powder and dense pellet form for such uses as optical coating and thin film applications. Oxides tend to be insoluble. Fluorides are another insoluble form for uses in which oxygen is undesirable such as metallurgy, chemical and physical vapor deposition and in some optical coatings. Samarium is also available in soluble forms including chlorides, nitrates and acetates. These compounds can be manufactured as solutions at specified stoichiometries.

Samarium is somewhat toxic. Safety data for Samarium and its compounds can vary widely depending on the form. For potential hazard information, toxicity, and road, sea and air transportation limitations, such as DOT Hazard Class, DOT Number, EU Number, NFPA Health rating and RTECS Class, please see the specific material or compound referenced in the Products tab below.


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Samarium Properties


GENERAL PROPERTIES   PHYSICAL PROPERTIES  
Symbol: Sm Melting Point: 1072 oC, 1961.6 oF, 1345.15 K
Atomic Number: 62 Boiling Point: 1794 oC, 3261.2 oF, 2067.15 K
Atomic Weight: 150.36 Density: 7353 kg/m³
Element Category: Lanthanides Liquid Density @ Melting Point: 7.16 g·cm−3
Group, Period, Block: n/a, 6, f Specific Heat: 0.043 Cal/g/K @ 25 °C
    Heat of Vaporization 46 K-cal/gm atom at 1791°C
CHEMICAL STRUCTURE Heat of Fusion 2.60 Cal/gm mole
Electrons: 62 Thermal Conductivity: 0.133 W/cm/K @ 298.2 K
Protons: 62 Thermal Expansion: (r.t.) (α, poly) 12.7 µm/(m·K)
Neutrons: 88 Electrical Resistivity: 88.0 microhm-cm @ 25°C
Electron Configuration: [Xe] 4f66s2 Electronegativity: 1.2 Paulings
Atomic Radius: 180 pm Tensile Strength: N/A
Covalent Radius: 198±8 pm Molar Heat Capacity: 29.54 J·mol−1·K−1
Van der Waals radius: 229 pm Young's Modulus: (α form) 49.7 GPa
Oxidation States: 4, 3, 2, 1 (mildly basic oxide) Shear Modulus: (α form) 19.5 GPa
Phase: Solid Bulk Modulus: (α form) 37.8 GPa
Crystal Structure: rhombohedral Poisson Ratio: (α form) 0.274
Magnetic Ordering: paramagnetic Mohs Hardness: N/A
1st Ionization Energy: 544.53 kJ mol-1 Vickers Hardness: 412 MPa
2nd Ionization Energy: 1068.10 kJ mol-1 Brinell Hardness: 441 MPa
3rd Ionization Energy: 2257.77 kJ mol-1 Speed of Sound: (20 °C) 2130 m·s−1
       
IDENTIFIERS   MISCELLANEOUS  
CAS Number: 7440-19-9 Abundance in typical human body, by weight: N/A
ChemSpider ID: 22391 Abundance in typical human body, by atom: N/A
PubChem CID: 23951 Abundance in universe, by weight: 5 ppb
MDL Number: MFCD00011233 Abundance in universe, by atom: 0.04 ppb
EC Number: 231-128-7 Discovered By: Lecoq de Boisbaudran
Beilstein Number: N/A Discovery Date: 1879
SMILES Identifier: [Sm]  
InChI Identifier: InChI=1S/Sm Other Names: Samario
InChI Key: KZUNJOHGWZRPMI-UHFFFAOYSA-N  
       
       
       
       
       

Samarium Products

Metal Forms  •  Compounds  •  Alloys  •  Oxide Forms  •  Organometallic Compounds
Sputtering Targets  •  Nanomaterials  •  Semiconductor Materials •  Isotopes



Recent Research & Development for Samarium

  • Sara Karimi Behzad, Ezzatollah Najafi, Mostafa M. Amini, Mohammad Janghouri, Ezeddin Mohajerani, Seik Weng Ng, Yellow-green electroluminescence of samarium complexes of 8-hydroxyquinoline, Journal of Luminescence, Volume 156, December 2014
  • Ying-Hui Li, Jian-Feng Huang, Jia-Yin Li, Li-Yun Cao, Jing Lu, Jian-Peng Wu, A hydrothermal assisted method to prepare Samarium Tungstate sheets at lowered reaction temperature, Materials Letters, Volume 135, 15 November 2014
  • Yaru Ni, Jing Tao, Junyang Jin, Chunhua Lu, Zhongzi Xu, Feng Xu, Jiamei Chen, Zhitao Kang, An investigation of the effect of ligands on thermal stability of luminescent samarium complexes, Journal of Alloys and Compounds, Volume 612, 5 November 2014
  • Qinghua Li, Yongbiao Yuan, Taihuei Wei, Yue Li, Zihan Chen, Xiao Jin, Yuancheng Qin, Weifu Sun, The origin of efficiency enhancement of inorganic/organic Hybrid solar Cells by robust samarium phosphate nanophosphors, Solar Energy Materials and Solar Cells, Volume 130, November 2014
  • Akihito Nishii, Kenji Shinozaki, Tsuyoshi Honma, Takayuki Komatsu, Morphology and Orientation of ß-BaB2O4 Crystals Patterned by Laser in the Inside of Samarium Barium Borate Glass, Journal of Solid State Chemistry, Available online 6 October 2014
  • Tyler T. Norton, Bo Lu, Y.S. Lin, Carbon dioxide permeation properties and stability of samarium-doped-ceria carbonate dual-phase membranes, Journal of Membrane Science, Volume 467, 1 October 2014
  • S.A. Muhammed Ali, Ros Emilia Rosli, Andanastuti Muchtar, Abu Bakar Sulong, Mahendra Rao Somalu, Edy Herianto Majlan, Effect of sintering temperature on surface morphology and electrical properties of samarium-doped ceria carbonate for solid oxide fuel cells, Ceramics International, Available online 22 September 2014
  • Cuiping MAO, Bin ZHANG, Xiaoning TANG, Huan LI, Suqiong HE, Optimized preparation of zinc-inorganic antibacterial material containing samarium using response surface methodology, Journal of Rare Earths, Volume 32, Issue 9, September 2014
  • S.N. Savvin, A.V. Shlyakhtina, I.V. Kolbanev, A.V. Knotko, D.A. Belov, L.G. Shcherbakova, P. Nuñez, Zr-doped samarium molybdates — potential mixed electron–proton conductors, Solid State Ionics, Volume 262, 1 September 2014
  • Jiang WU, Guoliang ZHANG, Jie LIU, Hongbing GAO, Chunxiang SONG, Haoran DU, Li ZHANG, Zhongping GONG, Yuguang LÜ, Synthesis, characteristics, and antibacterial activity of a rare-earth samarium/silver/titanium dioxide inorganic nanomaterials, Journal of Rare Earths, Volume 32, Issue 8, August 2014

Samarium Isotopes


Samarium (Sm) has five stable isotopes: 144Sm, 149Sm, 150Sm, 152Sm and 154Sm.

Nuclide Symbol Isotopic Mass Half-Life Nuclear Spin
144Sm 143.911999 Observationally Stable 0+
149Sm 148.9171847 Observationally Stable 7/2-
150Sm 149.9172755 Observationally Stable 0+
152Sm 151.9197324 Observationally Stable 0+
154Sm 153.9222093 Observationally Stable 0+