Yttrium oxyfluoride

Yttrium oxyfluoride is an inorganic chemical compound with the formula Template:Chem2. Under normal conditions, the compound is a colorless solid.

Synthesis

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

$\mathrm{𝟤}𝖸{𝖥}_{\mathrm{𝟥}}\mathsf{\cdot }\mathrm{𝟣}/\mathrm{𝟤}{𝖧}_{\mathrm{𝟤}}𝖮\stackrel{\tau ,900^{o}C}{\to }𝖸𝖮𝖥\mathsf{+}𝖸{𝖥}_{\mathrm{𝟥}}\mathsf{+}\mathrm{𝟤}𝖧𝖥$

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

$\mathrm{𝟤}𝖸{𝖥}_{\mathrm{𝟥}}\mathsf{+}{𝖧}_{\mathrm{𝟤}}𝖮\stackrel{800^{o}C}{\to }𝖸𝖮𝖥\mathsf{+}\mathrm{𝟤}𝖧𝖥$

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.