Holmium(III) fluoride
3D model (JSmol)
ECHA InfoCard 100.033.942 Edit this at Wikidata
EC Number
  • 237-352-1
  • InChI=1S/3FH.Ho/h3*1H;/q;;;+3/p-3
  • F[Ho](F)F
Molar mass 221.93
Appearance yellowish powder
Density 7.64g/cm3[1]
Melting point 1145 °C[2]
Boiling point >2200 °C[1]
GHS labelling:
GHS06: ToxicGHS07: Exclamation mark
H301, H311, H315, H319, H331, H335
P261, P264, P270, P271, P280, P301+P310, P302+P352, P304+P340, P305+P351+P338, P311, P312, P321, P322, P330, P332+P313, P337+P313, P361, P362, P363, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Holmium(III) fluoride is an inorganic compound with a chemical formula of HoF3.


Holmium(III) fluoride can be produced by reacting holmium oxide and ammonium fluoride, then crystallising it from the ammonium salt formed in solution:[3]

Ho2O3 + 6NH4F ⟶ 2HoF3 + 6NH3 + 2H2O

It can also be prepared by directly reacting holmium with fluorine:[4]

2Ho + 3F2 → 2HoF3


Holmium(III) fluoride is a yellowish powder that is insoluble in water.[5] It has an orthorhombic crystal system (corresponding to β-YF3[6]) with the space group Pnma (space group no. 62).[7] However, there is also a trigonal low-temperature form of the lanthanum(III) fluoride type.[3]


  1. ^ a b "Holmium Fluoride".
  2. ^ Shaimuradov, I. B.; Reshetnikova, L. P.; Novoselova, A. V. Phase diagram of the potassium fluoride-holmium fluoride system. Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy, 1974. 10 (8). 1468-1471. ISSN 0002-337X.
  3. ^ a b Janiak, Christoph; Meyer, Hans-Jürgen; Gudat, Dietrich; Alsfasser, Ralf (2012-01-27). Riedel Moderne Anorganische Chemie (in German). Walter de Gruyter. ISBN 978-3-11-024901-9.
  4. ^ "Chemical reactions of Holmium". Webelements. Retrieved 2009-06-06.
  5. ^ Holmium(III) fluoride at AlfaAesar, accessed on 2023-12-22 (PDF) (JavaScript required).[dead link]
  6. ^ Sobolev, Boris P. (2001). The rare earth trifluorides Introduction to materials science of multicomponent metal fluoride crystals. Arxius de les seccions. Barcelona: Institut d'Estudis Catalans. ISBN 978-84-7283-610-5.
  7. ^ Ans, Jean d'; Lax, Ellen (1998). Taschenbuch für Chemiker und Physiker (in German). Springer. ISBN 978-3-540-60035-0.