Compounds, inorganic or organic, of rare-earth metals; Compounds of europium, holmium, erbium, thulium, ytterbium, lutetium or yttrium

INORGANIC CHEMICALS; ORGANIC OR INORGANIC COMPOUNDS OF PRECIOUS METALS, OF RARE-EARTH METALS, OF RADIOACTIVE ELEMENTS OR OF ISOTOPES

Compounds, inorganic or organic, of rare-earth metals, of yttrium or of scandium or of mixtures of these metals