rare earth,rare earth metal,rare earth alloy,rare earth oxide,rare earth boride,rare earth fluoride,rare earth chloride,rare earth carbonate,rare earth nitrate, rare earth acetate,Lanthanum,Cerium,Praseodymium,Neodymium,Samarium,Europium,Gadolinium,Terbium,Dysprosium,Holmium,Erbium,Thulium,Ytterbium,Lutetium,Scandium,Yttrium