Holmium(III) chloride

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Holmium(III) chloride
CAS number 10138-62-2 YesY
14914-84-2 (hexahydrate)
PubChem 24992
Molecular formula HoCl3
Molar mass 271.289 g/mol
Appearance yellow crystals
Density 3.7 g/cm3
Melting point 720 °C[1]
Boiling point 1500 °C (decomp)
Solubility in water dissolves
Crystal structure Monoclinic, mS16
Space group C12/m1, No. 12
Related compounds
Other anions Holmium(III) oxide
Other cations Dysprosium(III) chloride, Erbium(III) chloride
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Holmium(III) chloride is the inorganic compound with the formula HoCl3. It is a common salt but is mainly used in research. It exhibits the same color-changing behavior seen in holmium oxide, being a yellow in natural lighting and a bright pink color in fluorescent lighting.


It forms upon union of the elements, but a more commonly used method involves heating a mixture of holmium(III) oxide and ammonium chloride at 200-250 °C:[2]

Ho2O3 + 6 NH4Cl → 2 HoCl3 + 6 NH3 + 2 H2O


In the solid state it has the YCl3 layer structure. [3]


  1. ^ Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3. 
  2. ^ Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY.
  3. ^ Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford. ISBN 0-19-855370-6