Impurity composition of the samples in the exhibition-collection of extrapure substances: I. samples of elemental substances received in 2007-2015.

Data are presented on the purity of the samples of elemental substances, including isotopically enriched samples, received by the Exhibition-Collection of Extrapure Substances in 2007-2015. During this time period, the permanent exhibition received 26 samples of elemental substances from 11 institutes and research and production centers of Russia. The first samples of high-purity isotopically enriched silicon, germanium, sulfur, and selenium were provided. The total impurity concentration in the best samples is 3 × 10 to n × 10 at %. More than half of the new samples compare well to the current world level. [ABSTRACT FROM AUTHOR]