Erbium, atomic composition

By using the intensity difference curve the light atom interactions can be eliminated and the RDF, including only interactions involving the metal ions, can be calculated. The results, referred to the erbium(III) solutions, are shown in Fig. 23 for three nitrate solutions of different compositions, including the 2.9 M solution illustrated in Fig. 22. The intramolecular N03 interactions together with all other nonmetal interactions are now eliminated and the first coordination peak appears as a separate peak. Its shape, however, depends on the composition of the solution, contrary to what was found for perchlorate solutions of similar compositions, and in comparison with these it is significantly broadened. For the 1 M solutions the difference is small but it becomes much more pronounced, when the concentration of nitrate ions is in-... 

For example, the isotopic composition and the atomic weight of neodyminm," dysprosium and erbium have been determined using synthetic mixtnres prepared gravimetrically from highly enriched isotopes of neodymium in the form of oxides of weU defined pnrity by TIMS. No natnral isotopic variation was found in terrestrial neodymium, dysprosium or erbium samples. These isotopic compositions of Dy and Er measnred by TIMS are accepted as the best measurements from a single terrestrial source as noted in the table of isotopic composition of elements, 2001. °... 

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