Lutetium Elemental Symbol

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Lutécium Lutetium Lutezio Lutécio Lutecio Lutetium

Lutetium (Lu) atomic and molecular weight, atomic number and elemental symbolLutetium is a Block F, Group 3, Period 6 element. The number of electrons in each of Lutetium's shells is 2, 8, 18, 32, 9, 2 and its electron configuration is [Xe] 4f15 5d1 6s2. Lutetium Bohr ModelIn its elemental form, CAS 7439-94-3, lutetium has a silvery-white appearance. The lutetium atom has a radius of and it's Van der Waals radius is Lutetium is the last member of the rare earth series. Unlike most rare earths it lacks a magnetic moment. It has the smallest metallic radius of any rare earth and it is perhaps the least naturally abundant of the lanthanides. The most common source of commercially produced Lutetium is the mineral monazite. Elemental LutetiumLutetium was first discovered by George Urbain and Carl Auer von Welsbach in 1906. The name Lutetium originates from the Latin word Lutetia meaning Paris.

Lutetium is the ideal host for x-ray phosphors because it produces the densest known white material, lutetium tantalate (LuTaO4). It is utilized as a dopant in matching lattice parameters of certain substrate garnet crystals, such as indium-gallium-garnet (IGG) crystals due its lack of a magnetic moment. Lutetium is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity). High Purity (99.999%) Lutetium Oxide (Lu2O3) PowderElemental or metallic forms include pellets, rod, wire and granules for evaporation source material purposes. Lutetium 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. FluoridesHigh Purity (99.999%) Lutetium (Lu) Sputtering Target are another insoluble form for uses in which oxygen is undesirable such as metallurgy, chemical and physical vapor deposition and in some optical coatings. Lutetium is also available in soluble forms including chlorides, nitrates and acetates. These compounds can be manufactured as solutions at specified stoichiometries.

Lutetium is not toxic in its elemental form, however, safety data for lutetium 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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Lutetium Properties

Symbol: Lu Melting Point: 1663 oC, 3025.4 oF, 1936.15 K
Atomic Number: 71 Boiling Point: 3402 oC, 6155.6 oF, 3675.15 K 
Atomic Weight: 174.97 Density: 9.840 gm/cc
Element Category: Lanthanides Liquid Density @ Melting Point: 9.3 g·cm−3
Group, Period, Block: n/a, 6, d Specific Heat: 0.037 Cal/g/K @ 25°C
    Heat of Vaporization 90 K-Cal/gm atom at 3395°C
CHEMICAL STRUCTURE Heat of Fusion 4.60 Cal/gm mole
Electrons: 71 Thermal Conductivity: 0.164 W/cm/K @ 298.2 K
Protons: 71 Thermal Expansion: (r.t.) (poly) 9.9 µm/(m·K)
Neutrons: 104 Electrical Resistivity: 79.0 microhm-cm @ 25°C
Electron Configuration: [Xe] 4f145d16s2 Electronegativity: 1.2 Paulings
Atomic Radius: 174 pm Tensile Strength: N/A
Covalent Radius: 187±8 pm Molar Heat Capacity: 26.86 J·mol−1·K−1
Van der Waals radius: 221 pm Young's Modulus: 68.6 GPa
Oxidation States: 3, 2, 1 (weakly basic oxide) Shear Modulus: 27.2 GPa
Phase: Solid Bulk Modulus: 47.6 GPa
Crystal Structure: hexagonal close-packed Poisson Ratio: 0.261
Magnetic Ordering: paramagnetic Mohs Hardness: N/A
1st Ionization Energy: 523.52 kJ mol-1 Vickers Hardness: 1160 MPa
2nd Ionization Energy: 1341.16 kJ mol-1 Brinell Hardness: 893 MPa
3rd Ionization Energy: 2022.29 kJ mol-1 Speed of Sound: N/A
CAS Number: 7439-94-3 Abundance in typical human body, by weight: N/A
ChemSpider ID: 22371 Abundance in typical human body, by atom: N/A
PubChem CID: 23929 Abundance in universe, by weight: 0.1 ppb
MDL Number: MFCD00011098 Abundance in universe, by atom: 0.001 ppb
EC Number: 231-103-0 Discovered By: Georges Urbain and Carl Auer von Welsbach
Beilstein Number: N/A Discovery Date: 1906
SMILES Identifier: [Lu]  
InChI Identifier: InChI=1S/Lu Other Names: Lutezio, Lutécio

Lutetium Products

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


Recent Research & Development for Lutetium

  • Jingjing Yang, Fang Wu, Zheng Zhu, Lan Yao, Hongzhang Song, Xing Hu, Thermoelectrical properties of lutetium-doped Bi2Te3 bulk samples prepared from flower-like nanopowders, Journal of Alloys and Compounds, Volume 619, 15 January 2015
  • N.I. Matskevich, Th. Wolf, Thermochemical investigation of YBa2Cu3O7−δ superconductor doped by lutetium, Journal of Alloys and Compounds, Volume 614, 25 November 2014
  • V.V. Novikov, N.V. Mitroshenkov, A.V. Matovnikov, D.V. Avdashchenko, A.V. Morozov, L.M. Pavlova, V.B. Koltsov, Low-temperature thermal properties and features of the phonon spectrum of lutetium tetraboride, Journal of Alloys and Compounds, Volume 613, 15 November 2014
  • Toshihiko Shimizu, Kohei Yamanoi, Ren Arita, Tatsuhiro Hori, Kazuhito Fukuda, Yuki Minami, Marilou Cadatal-Raduban, Nobuhiko Sarukura, Tsuguo Fukuda, Mitsuru Nagasono, Tetsuya Ishikawa, Optical property of Ce3+-doped lutetium lithium fluoride for the short-wavelength device application, Optical Materials, Volume 36, Issue 12, October 2014
  • S. Kardellass, C. Servant, N. Selhaoui, A. Iddaoudi, Thermodynamic evaluations of the iron–lutetium and iron–thulium systems, Calphad, Volume 46, September 2014
  • A. Samaniego, K. Gusieva, I. Llorente, S. Feliu Jr., N. Birbilis, Exploring the possibility of protective surface oxides upon Mg alloy AZ31 via lutetium additions, Corrosion Science, Available online 23 August 2014
  • Junlang Li, Jian Xu, Ying Shi, Hongfang Qi, Jianjun Xie, Fang Lei, Fabrication and microstructure of cerium doped lutetium aluminum garnet (Ce:LuAG) transparent ceramics by solid-state reaction method, Materials Research Bulletin, Volume 55, July 2014
  • H. Przybylińska, A. Wittlin, Chong-Geng Ma, M.G. Brik, A. Kamińska, P. Sybilski, Yu. Zorenko, M. Nikl, V. Gorbenko, A. Fedorov, M. Kučera, A. Suchocki, Rare-earth antisites in lutetium aluminum garnets: Influence on lattice parameter and Ce3+ multicenter structure, Optical Materials, Volume 36, Issue 9, July 2014
  • Ceyda Bozoğlu, Mürsel Arıcı, Ahmet Lütfi Uğur, Ali Erdoğmuş, Atıf Koca, Electrochemical and spectroelectrochemical properties of methylendioxy-phenoxy-substituted novel lutetium (III) mono- and bis-phthalocyanines, Synthetic Metals, Volume 190, April 2014
  • Sebahattin Karadağ, Ceyda Bozoğlu, M. Kasım Şener, Atıf Koca, Synthesis and electrochemical properties of a double-decker lutetium(III) phthalocyanine bearing electropolymerizable substituents on non-peripheral positions, Dyes and Pigments, Volume 100, January 2014

Lutetium Isotopes

Naturally occurring lutetium (Lu) has 1 stable isotope, 175Lu.

Nuclide Symbol Isotopic Mass Half-Life Nuclear Spin
175Lu 174.9407718 Observationally Stable 7/2+