It is used for optical glass, illuminant materials, alloy materials, katalyst etc. very good priceCe2O3,% ≤0.002Pr6O11,% ≤0.002Nd2o3,% ≤0.001Sm2O3,% ≤0.001Y2O3,% ≤0.001Fe2O3,% ≤0.0005 Name: Lanthanum Oxide (99.9-99.99%) StandardGB/T 4154-1993 Main ContentLa2O3/TREO(%) 99.995TREO(%) 99(ppm) RE impurities(ppm) Non-RE impurities Item Index Item IndexCeO20.0005Fe2O30.0003Pr6O110.0005SiO2—Nd2O30. ...