Lanthanum silicate 2La2O3 · 3SiO3

Summary

1.
Lanthanum silicate 2La₂O₃·3SiO₂ was synthesized; it melts congruently at 2020”. The mean refractive index of crystals of this compound is 1.90.
2.
Lanthanum silicate is characterized by hexagonal syngony. The parameters of its elementary cell were determined.
3.
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.
4.
It is probable that lanthanum silicate belongs to the olivine group and is lanthanum orthosilicate La₄(SiO₄)₃.

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C. E. Curtis and J. R. Johnson, J. Am. Ceram. Soc. 40, 1, 15 (1957).
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N. V. Belov, Crystallography 3, 3, 250 (1958).
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Institute of Silicate Chemistry of the Academy of Sciences of the USSR, USSR
N. A. Toropov & I. A. Bondar'

Authors

N. A. Toropov
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I. A. Bondar'
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Toropov, N.A., Bondar', I.A. Lanthanum silicate 2La₂O₃ · 3SiO₃ . Russ Chem Bull 8, 528–530 (1959). https://doi.org/10.1007/BF00917716

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