Summary
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1.
The phase diagrams of the binary systems Dy2O3-SiO2 and Er2O3-SiO2 were studied and constructed.
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2.
Compounds of the types oxyorthosilicates (Dy2O[SiO4] and Er2O[SiO4), orthosilicates (Dy4[SiO4]3 and Er4SiO4 3), and pyrosilicates zed. The properties of these compounds were studied.
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3.
The compound Er2[Si2O7], in contrast to other pyrosilicates of rare earth elements with atomic number lower than that of erbium, melts without decomposition and has higher birefringence.
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4.
The limits of the separation regions in the studied systems were established, and their upper critical points were determined.
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5.
Dysprosium oxide polymorphism was detected. Erbium oxide is not polymorphic.
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Toropov, N.A., Galakhov, F.Y. & Konovalova, S.F. Silicates of the rare earth elements communication 5. phase diagrams of the Dy2O3-SiO2 and Er2O3-SiO2 systems. Russ Chem Bull 10, 1271–1277 (1961). https://doi.org/10.1007/BF00910094
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DOI: https://doi.org/10.1007/BF00910094