Holmium oxychloride

Holmium oxychloride
Names
	Other names Holmium oxide chloride; Holmium(III) oxychloride;
Identifiers
3D model (JSmol)	Interactive image;
	InChI InChI=1S/ClH.Ho.O/h1H;;/q;+3;-2/p-1 Key: PSLCQZBYWJDMHI-UHFFFAOYSA-M;
	SMILES [Cl-].[Ho+3].[O-2];
Properties
Chemical formula	ClHoO
Molar mass	216.38 g·mol−1
Appearance	crystals
Density	7.23 g/cm3
Structure
Crystal structure	tetragonal
Space group	P4nmm
Related compounds
Related compounds	Praseodymium oxychloride; Neodymium oxychloride; Lanthanum oxychloride; Plutonium oxychloride;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Holmium oxyfluoride is an inorganic compound of holmium, oxygen, and chlorine with the chemical formula HoOCl.^[1]^[2]

Synthesis

Decomposition of holmium(III) chloride crystallohydrate by heating:

HoCl₃·6H₂O → HoOCl + 2HCl + 5H₂O

The compound forms crystals of the tetragonal system, space group P4nmm.^[3]

^ Koch, Charles William (1953). Thermodynamics of the Trichlorides and Oxychlorides of Some of the Lanthanide and Actinide Elements (thesis). Radiation Laboratory, University of California. p. 82. Retrieved 15 July 2025.
^ Kong, Lingxin; Ouchi, Takanari; Okabe, Toru H. (15 May 2021). "Deoxidation of Ti using Ho in HoCl3 flux and determination of thermodynamic data of HoOCl". Journal of Alloys and Compounds. 863 156047. doi:10.1016/j.jallcom.2020.156047. ISSN 0925-8388. Retrieved 15 July 2025.
^ Donnay, Joseph Désiré Hubert (1973). Crystal Data: Inorganic compounds. National Bureau of Standards. p. 121. Retrieved 15 July 2025.