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

  • 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
  • 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.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
  • B. Renganathan, D. Sastikumar, R. Srinivasan, A.R. Ganesan, Nanocrystalline samarium oxide coated fiber optic gas sensor, Materials Science and Engineering: B, Volume 186, August 201
  • Adam Strzep, Witold Ryba-Romanowski, Radoslaw Lisiecki, Xiaodong Xu, Jun Xu, Juqing Di, Spectroscopic characterization of CaNb2O6 single crystal doped with samarium ions, Journal of Luminescence, Volume 151, July 2014
  • Daogao WU, Shihong YAN, Zhiqiang WANG, Zhiqi ZHANG, Ruiying MIAO, Xiaowei ZHANG, Dehong CHEN, Effect of samarium on microstructure and corrosion resistance of aged as-cast AZ92 magnesium alloy, Journal of Rare Earths, Volume 32, Issue 7, July 2014
  • Xuechao HU, Huizhong YAN, Baoquan LI, Jin LI, Li WANG, Wei XIONG, Effect of the partial substitution of samarium for lanthanum on the structure and electrochemical properties of La15Fe77B8-type hydrogen storage alloys, Journal of Rare Earths, Volume 32, Issue 6, June 2014
  • B. Sathyamoorthy, P.M. Md Gazzali, C. Murugesan, G. Chandrasekaran, Electrical properties of samarium cobaltite nanoparticles synthesized using Sol–Gel autocombustion route, Materials Research Bulletin, Volume 53, May 2014
  • Xiangyu Xia, Amirreza Sanaty-Zadeh, Chuan Zhang, Alan A. Luo, Xiaoqin Zeng, Y. Austin Chang, Donald S. Stone, Thermodynamic modeling and experimental investigation of the magnesium–zinc–samarium alloys, Journal of Alloys and Compounds, Volume 593, 25 April 2014
  • Kinshuk Dasgupta, D.K. Singh, D.K. Sahoo, M. Anitha, A. Awasthi, H. Singh, Application of Taguchi method for optimization of process parameters in decalcification of samarium–cobalt intermetallic powder, Separation and Purification Technology, Volume 124, 18 March 2014
  • Parvinder Kaur, Simranpreet Kaur, Gurinder Pal Singh, D.P. Singh, Cerium and samarium codoped lithium aluminoborate glasses for white light emitting devices, Journal of Alloys and Compounds, Volume 588, 5 March 2014
  • Dian-Yu Chen, Jian-Hua Zou, Wu-Xiang Li, Bo Xu, Qiao-Yun Li, Gao-Wen Yang, Juan Wang, Ya-Mei Ding, Ying Zhang, Xiao-Feng Shen, Synthesis, crystal structure and catalytic property of a samarium complex with Hpytza [Hpytza = 5-(3-pyridyl) tetrazole-2-acetic acid], Inorganic Chemistry Communications, Volume 40, February 2014
  • Xianglan XU, Hong HAN, Jianjun LIU, Wenming LIU, Wenlong LI, Xiang WANG, Promotional effects of samarium on Co3O4 spinel for CO and CH4 oxidation, Journal of Rare Earths, Volume 32, Issue 2, February 2014
  • Zhang Hongsong, Yan Shuqing, Chen Xiaoge, Preparation and thermophysical properties of fluorite-type samarium–dysprosium–cerium oxides, Journal of the European Ceramic Society, Volume 34, Issue 1, January 2014
  • Yuanliang Li, Ranran Wang, Xuegang Ma, Zhongqiu Li, Rongli Sang, Yuanfang Qu, Dielectric behavior of samarium-doped BaZr0.2Ti0.8O3 ceramics, Materials Research Bulletin, Volume 49, January 2014
  • B.A. Sava, M. Elisa, L. Boroica, R.C.C. Monteiro, Preparation method and thermal properties of samarium and europium-doped alumino-phosphate glasses, Materials Science and Engineering: B, Volume 178, Issue 20, 1 December 2013
  • I.G. Fomina, Zh.V. Dobrokhotova, ?.B. Ilyukhin, G.G. Aleksandrov, V.O. Kazak, ?.?. Gehman, N.N. Efimov, A.S. Bogomyakov, Y.S. Zavorotny, V.I. Gerasimova, V.M. Novotortsev, I.L. Eremenko, Binuclear samarium(III) pivalates with chelating N-donors: Synthesis, structure, thermal behavior, magnetic and luminescent properties, Polyhedron, Volume 65, 28 November 2013
  • Wen-Xian Li, Shu-Yan Feng, Yu Liu, Jing Zhang, Xiao-Dong Xin, Bo-Yang Ao, Ying-Jie Li, Fluorescence enhancement of samarium (III) perchlorate by 1,10-phenanthroline on Phenylnaphthoylmethyl sulfoxide complex and luminescence mechanism, Journal of Luminescence, Volume 143, November 2013
  • Zhi HU, Hong YAN, Yuan-sheng RAO, Effects of samarium addition on microstructure and mechanical properties of as-cast Al-Si-Cu alloy, Transactions of Nonferrous Metals Society of China, Volume 23, Issue 11, November 2013
  • José M. Carretas, Sónia Barroso, Jinlan Cui, Adelaide Cruz, Isabel C. Santos, Ana M. Martins, Diamine bis(phenolate) samarium complexes: Synthesis and structures, Inorganica Chimica Acta, Volume 407, 1 October 2013

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+