Holmium single crystal 67Ho164.930

We are a leading manufacturer and supplier of research materials

Holmium 67Ho164.930

Holmium was discoverd in 1878 by P.T. Cleve at Uppsala, Sweden, and independently by M. Delafontaine and J.L. Soret at Geneva, Switzerland.

[Greek: Holmia = Sweden]
  French: holmium
  German: holmium
  Italian: olmio
  Spanish: holmio

Description: Holmium is a silvery metal of the so-called rare earth group (more correctly termed the lanthanides). It is slowly attacked by oxygen and water, and dissolves in acids. Holmium is used as a flux concentrator for high magnetic fields.

Holmium single crystal properties


State: Single crystal
Crystal structure: hexagonal
Production method: Floating zone
Standard size: diameter 7-8mm
thickness 1mm
Orientation: (0001)
Orientation accuracy: <2°, <1°, <0.4° or <0.1°
Polishing: as cut, one or two sides polished
Roughness of surface: <0.03 µm
Purity: 99.99%



Further Materials properties


Crystal structure: (cell dimensions/pm), space group
a-Ho h.c.p. (a=357.73, c=561.58), P63/mmc
b-Ho b.c.c. (a=396), Im3m
T(a -> a)= just below melting point
High pressure form: (a=334, c=2410), R3m
X-ray diffractions mass absorption coefficients: CuKa 128 (µ/r) / cm2g-1
MoKa 73.9 (µ/r) / cm2g-1
Neutron scattering length: 0.808 b/10-12 cm
Thermal neutron capture cross-section: 65 sa / barns
Density: 8.8 kg/m-3 [293 K]; 2390 [liquid at m.p.]
Melting point: 1473.85 °C / 1747 °K
Boiling point: 2694.85 °C / 2968 °K
Molar volume: 18.75 cm3
Thermal conductivity: 16.2 [300 K] Wm-1K-1
Coefficient of linear thermal expansion: 9.5 x 10-6 K-1
Electrical resistivity: 87.0 x 10-8 [293 K] Wm
Mass magnetic susceptibility: +5.49 x 10-6(s) kg-1m3
Young's modulus: 64.8 GPa
Rigidity modulus: 26.3 GPa
Bulk modulus: 40.2 GPa
Poisson's ratio: 0.231 GPa
Radi: Ho3+ 89; atomic 177; covalent 158
Electronegativity: 1.23 (Pauling); 1.10 (Allred); £3.3 eV (absolute)
Effective nuclear charge: 2.85 (Slater); 8.44 (Clementi); 11.60 (Froese-Fischer)
Number of Isotopes (incl. nuclear isomers): 39
Isotope mass range: 148 -> 170



Biological data


Biological role: none, but acts to stimulate metabolism
Toxic intake: n.a.
Lethal intake: LD50 (chloride, oral, mouse)=7200 mg kg-1
Hazards: Holmium is mildly toxic by ingestion
Level in humans  
Organs: n.a., but low
Daily dietary intake: n.a.
Total mass of element in average
[70 kg] person:


Geological data


Minerals:Many minerals are known, and aluminium is present in many other minerals
MineralFormulaDensityHardnessCrystal apperance
Bastnäsite  (Ce, La etc.) Co3F  4.9  4 - 4.5  hex., vit./greasy yellow
Monazite  (Ce, La, Nd, Th etc.) PO4  5.20  5 - 5.5  mon., waxy/vit., yellow-brown


Chief ore: monazite, bastnäsite
World production: c. 10 tonnes/year
Main mining areas: USA, Brazil, India, Sri Lanka, Australia, China
Reserves: 4 x 105 tonnes
Specimen: available as ingots or granules. Safe.


Sun: n.a.
Earth's crust: 1.4 ppm
Atlantic surface: 2.4 x 10-7 ppm
Atlantic deep: 2.9 x 10-7 ppm
Pacific surface: 1.6 x 10-7 ppm
Pacific deep: 5.8 x 10-7 ppm
Residence time: n.a.
Classification: recycled
Oxidation state: III


Other sizes and specifications on request

Overview of elements with access to our shop

1 18
2 13 14 15 16 17
Li Be B C
Na Mg 3 4 5 6 7 8 9 10 11 12 Al Si P S
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se
Rb Sr Y Zr Nb Mo
Ru Rh Pd Ag Cd In Sn Sb Te I
Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi
Ce Pr Nd
Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Get our latest news and special sales
You may unsubscribe at any moment. For that purpose, please find our contact info in the legal notice.
Tel.: +49 (0) 2461 - 9352 - 0
Fax: +49 (0) 2461 - 9352 - 11