Yttrium oxyfluoride is an
inorganic chemical compound with the formula . 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:
::
Yttrium oxyfluoride can also be made by hydrolysis of yttrium fluoride with
superheated steam
Superheated steam is steam at a temperature higher than its vaporization point at the absolute pressure where the temperature is measured.
Superheated steam can therefore cool (lose internal energy) by some amount, resulting in a lowering of its ...
at 800 °C:
::
Physical properties
Yttrium oxyfluoride forms colorless crystals of
tetragonal crystal system
In crystallography, the tetragonal crystal system is one of the 7 crystal systems. Tetragonal crystal lattices result from stretching a cubic lattice along one of its lattice vectors, so that the cube becomes a rectangular prism with a square ...
; 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.
References
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Yttrium compounds
Oxyfluorides