An analytical method for the determination of traces of rare earth elements (REE) as impurities in high pure lanthanum oxide (La O ) 2 3 ́ produced in the Instituto de Pesquisas Energeticas e Nucleares (IPEN) and compared with the oxide of commercial lanthanum as a certified reference is discussed in this work. The REE as impurities in the lanthanum oxide were separated from the matrix by a high...

An analytical method for the determination of traces of rare earth elements (REE) as impurities in highly pure praseodymium oxide ́ (Pr O ) produced at the Instituto de Pesquisas Energeticas e Nucleares (IPEN) and a comparison with commercial praseodymium oxide 6 11 as a certified reference is reported. REE as impurities in praseodymium oxide were separated from the matrix by high-performance li...

Rare earth elements (REE) are widely used in advanced technology. Praseodymium (Pr), neodymium (Nd), samarium (Sm) and dysprosium (Dy) are used in high-power permanent magnets. Ytterbium (Yb), erbium (Er) and holmium (Ho) are used in lasers. Lanthanum (La), gadolinium (Gd), terbium (Tb), europium (Eu) and Yb are components of luminescent and fluorescent phosphors, used in fluorescent lamps, rad...

The paper discusses the geochemistry of major (EPMA) and trace (SIMS) elements in olivine porphyritic, nonporphyritic chondrules, matrix equilibrated ordinary chondrite Saratov (L4). Olivine corresponds to forsterite is rather heterogeneous (Fo 73-77). No differences content chondrule meteorite were found. However, within chondrules varies considerably; high values found from barred chondrules....

Christine Heim*, Klaus Simon, Danny Ionescu, Andreas Reimer, Dirk De Beer, Nadia-Valérie Quéric, Joachim Reitner and Volker Thiel 1 Department of Geobiology, Geoscience Centre, University of Göttingen, Göttingen, Germany 2 Department of Geochemistry, Geoscience Centre, University of Göttingen, Göttingen, Germany 3 Max-Planck-Institute for Marine Microbiology, Microsensor Research Group, Bremen,...

Ion microprobe analyses of oxygen isotope ratios in Early Archean (Hadean) zircons (4.0to 4.4-Ga) reveal variable magmatic O values, including some that are high relative to the mantle, suggesting interaction between magmas and already-formed continental crust during the first 500 million yr of Earth’s history. The high average O value of these zircons is confirmed by conventional analysis. A m...