Predicting Phase Stability of Materials Based on (Sc_(1-x)Ln_x)(SiO_4)_(0.5)O_(0.5), Ln= Tb - Lu and Y Solid Solutions

摘要

1 Introduction Solid solutions based on scandium oxyorthosilicate, Sc_2SiO_5, are promising materials for creating new efficient lasers for medicine, laser location [1], military equipment, telecommunications, metal cutting [2], environmental monitoring [3-5], and other purposes. They serve as matrices (host materials), while the triple-charged Ln~(3+) ions, which are contained in small amounts (up to 5 at.%), act as activators (dopants). In addition to oxyorthosilicates containing only scandium cations in their matrices [6, 7], we also studied materials based on "mixed" oxyorthosilicates with two different cations-scandium and rare-earth elements (REEs), which represent solid solutions of Sc_2SiO_5-Ln_2SiO_5 systems [8-11]. The use of "mixed" scandium and REE oxyorthosilicates is stipulated by the desire to obtain materials with better properties compared to Ln_2SiO_5, and which are less expensive compared to Sc_2SiO_5 since the cost of scandium is higher than one of REE.