Lanthanum silicate 2La2O3 · 3SiO3
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Lanthanum silicate 2La2O3·3SiO2 was synthesized; it melts congruently at 2020”. The mean refractive index of crystals of this compound is 1.90.
Lanthanum silicate is characterized by hexagonal syngony. The parameters of its elementary cell were determined.
The elementary cell contains two 2La2O3· 3SiO2 molecules. The pycnometric density of the compound is 5.31 g/cm3; the density calculated from the x-ray data is 5.303 g/cm3.
It is probable that lanthanum silicate belongs to the olivine group and is lanthanum orthosilicate La4(SiO4)3.
KeywordsSilicate Refractive Index Hexagonal Olivine Lanthanum
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