ABSTRACT

A multicomponent rare-earth disilicate (Gd_1/6Tb_1/6Dy_1/6Tm_1/6Yb_1/6Lu_1/6)₂Si₂O₇ has been designed and successfully synthesized following the strategy of high entropy engineering. The as-prepared single-phase 6RE-disilicate possesses a new γ-type crystal structure (monoclinic, P2₁/c) beyond the α-, β- and δ-type parent structures of six single RE disilicates. Six-species RE cations are homogeneously distributed on RE lattice sites and our multicomponent disilicate demonstrates outstanding thermal stability from room temperature up to around 1900°C. This work extends the knowledge of strategic multicomponent modification of complex ceramics with extremely high phase stability.

摘要

按照高熵工程策略设计并成功合成了多组分稀土二硅酸盐（Gd _1/6 Tb _1/6 Dy _1/6 Tm _1/6 Yb _1/6 Lu _1/6）₂ Si ₂ O _7。。制备的单相6RE-二硅酸盐具有新的γ型晶体结构（单斜晶系，P 2 ₁ / c）以外的六个单一RE二硅酸盐的α，β和δ型母体结构。六种RE阳离子均匀地分布在RE晶格部位，我们的多组分二硅酸盐在室温到1900°C的温度下均具有出色的热稳定性。这项工作扩展了具有极高相稳定性的复杂陶瓷战略多组分改性的知识。