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

Abstract

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^–5 to n × 10^–4 at %. More than half of the new samples compare well to the current world level.