Tungsten and oxygen
Tungsten and oxygen
Because of its bright yellow color it is used as a
pigment in oil and water colors. It is employed in a wide variety of catalysts,
most recently in catalysts for the control of air pollution and industrial
hygiene.
WO3 is also used as an addition to VO2 in "smart windows."
Thermochromism is the ability of a material to be transparent for infrared rays
below a certain transition temperature and to reflect above, due to a
crystallographic phase transition. The process is strictly reversible and there
is almost no influence on visible light. VO2 has a transition temperature at 68℃, which can be lowered by doping with WO3.
Glass coated with a thin film of the above mixed oxide is called a "smart window"
and is a promising candidate for use in automobiles and buildings for heat protection.
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