Yttrium oxyfluoride

Yttrium oxyfluoride is an inorganic chemical compound with the formula YOF.^[2] Under normal conditions, the compound is a colorless solid.^[3]

Yttrium oxyfluoride

Identifiers
3D model (JSmol)	Interactive image
PubChem CID	161123050
InChI InChI=1S/FH.O.Y/h1H;;/q;-2;+3/p-1 Key: ULEWOPXGNWLKFY-UHFFFAOYSA-M
SMILES [Y+3].[O-2].[F-]
Properties
Chemical formula	YOF
Molar mass	123.903 g/mol
Appearance	white powder
Density	5.18 g/cm3
Structure
Crystal structure	tetragonal
Space group	P4/nmm[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Yttrium oxyfluoride may be formed in the decomposition of crystalline hydrate of yttrium fluoride upon heating to 900 °C in a vacuum:

${\displaystyle {\mathsf {2YF_{3}\cdot 1/2H_{2}O\ {\xrightarrow {\tau ,900^{o}C}}\ YOF+YF_{3}+2HF}}}$

Yttrium oxyfluoride can also be made by hydrolysis of yttrium fluoride with superheated steam at 800 °C:

${\displaystyle {\mathsf {2YF_{3}+H_{2}O\ {\xrightarrow {800^{o}C}}\ YOF+2HF}}}$

Physical properties

Yttrium oxyfluoride forms colorless crystals of tetragonal crystal system; its cell parameters are: a = 0.3910 nm, c = 0.5431 nm. According to hexagonal crystal family, the cell parameters are: a = 0.38727 nm, c = 1.897 nm, Z = 6.

Applications

Stable yttrium oxyfluoride material is used for inner walls of plasma process equipment.^[4][5]