rare earth containing

  • Rare earth minerals and classification-Metalpedia

    Rare earth minerals and classification; Rare earth minerals; In the earth's crust, instead of existing as free metals, rare earth elements usually occur in the minerals of mixtures of various rare earth elements and nonmetals. More than 200 kinds of minerals have been discovered to contain essential or significant REE currently, and bastnaesite, monazite and xenotime are the three most ...

  • A Rare-Earth Phosphor Containing One-Dimensional Chains ...

    Feb 06, 1998 · Charge transfer of this type has been noted previously in rare earth compounds, mainly Ce-, Pr-, and Tb-based materials, in which 4+ and 3+ oxidation states are accessible. Although no visible luminescence was observed in any of these materials, none of them allowed the M 4+ cation to exist in a coordination environment where terminal M-O bonds exist.