Issues

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2019

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vol. 17 /

Issue 4

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E. I. Get'man, S. V. Radio
«Predicting the Substitution of Rare-Earth Elements with Cerium in the Solid Solutions Based on Nanoscale Ln\(_2\)SiO\(_5\) (Ln=Tb–Lu, Y)»
701–710 (2019)

PACS numbers: 61.68.+n, 64.75.Jk, 64.75.Nx, 65.40.G-, 82.33.Pt, 82.60.Lf

Mixing energies (17.2–44.9 kJ/mole), critical temperatures of decomposition (1029–2700 K), and decomposition temperatures for systems of nanoscale REE oxyorthosilicates Ln\(_{1-x}\)[(SiO\(_4)_{0.5}\)O\(_{0.5}\)]:Ce\(_x\) (Ln=Tb-Lu, Y) for compositions with \(\textit{x}\)=0.01, 0.02, 0.05, 0.10, and 0.20, which have luminescent properties, are calculated by means of the crystal-chemical method within the regular-solution approximation. A diagram is presented, which allows to determine decomposition temperature with a given equilibrium substitutional limit (\(\textit{x}\)) or substitutional limit with a given temperature as well as to assess areas of stability, instability, and metastability of solid solutions.

Keywords: solid solution, energy of mixing, isomorphous substitution, oxyorthosilicate of rare-earth elements, cerium

https://doi.org/10.15407/nnn.17.04.701

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© NANOSISTEMI, NANOMATERIALI, NANOTEHNOLOGII G. V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine, 2019
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