材料科学
稀土
天体生物学
土(古典元素)
地球科学
地球化学
地质学
冶金
物理
数学物理
标识
DOI:10.1016/0272-8842(82)90022-0
摘要
Binary systems of the type Ln 2 O 3 SiO 2 were studied. Three types of compounds were established for them: Ln 2 O, SiO 4 (1:1) diorthosilicate, Ln 2 Si 2 O 7 (1:2), and the apatite-like silicate, Ln 4.67 O [SiO 4 ] 3 (7:9), the latter being stable for the large cations. Systematization of the physical-chemical properties of rare-earth silicates was made. Based on the model of ideal solutions the liquidus curves were calculated for several Ln 2 O 3 Ln 2 O 3 SiO 2 systems. The solid solution limits were determined for complex systems formed by rare-earth and alkaline-earth silicates. A series of rare-earth single crystals of simple and complex composition were grown by crystallization from molten solutions. Classification of the same type compounds into structural groups (morphotropic series) was made and partecipation of the 4f-orbitals in bondings was considered. The spectral-luminiscence characteristics of the rare-earth silicates are given.
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