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Reference.org
Ytterbium(III) fluoride
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<p>Ytterbium(III) fluoride (YbF3) is an <a href="/facts/Inorganic/TfFfzxSz">inorganic</a> <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> that is insoluble in water. Like other Ytterbium compounds, it is a rather unremarkable white substance. Ytterbium fluoride has found a niche usage as a radio-opaque agent in the dental industry to aid in the identification of fillings under X-ray examination. </p>