Calcium, Lanthanide, and Zirconium Vanadates with the Zircon Structure: Preparation, Structure, and Behavior during Heating

A. K. Koryttseva; Корытцева А. К.; E. Yu. Borovikova; Боровикова Е. Ю.; A. I. Beskrovnyi; Бескровный А. И.; V. А. Turchenko; Турченко В. А.; K. E. Smetanina; Сметанина К. Е.; A. A. Murashov; Мурашов А. А.; A. V. Nokhrin; Нохрин А. В.; N. S. Litonova; Литонова Н. С.; A. I. Orlova; Орлова А. И.; D. M. Korshunov; Коршунов Д. М.

doi:10.31857/S0002337X23060106

Calcium, Lanthanide, and Zirconium Vanadates with the Zircon Structure: Preparation, Structure, and Behavior during Heating

Authors: Koryttseva A.K.¹, Borovikova E.Y.², Beskrovnyi A.I.³, Turchenko V.А.³, Smetanina K.E.¹, Murashov A.A.¹, Nokhrin A.V.⁴, Litonova N.S.⁴, Orlova A.I.¹, Korshunov D.M.⁵
Affiliations:
1. Lobachevsky State University
2. Faculty of Geology, Moscow State Universit
3. Joint Institute for Nuclear Research
4. Lobachevsky State University of Nizhny Novgorod
5. Geological Institute, Russian Academy of Sciences
Issue: Vol 59, No 6 (2023)
Pages: 646-653
Section: Articles
URL: https://journals.rcsi.science/0002-337X/article/view/140192
DOI: https://doi.org/10.31857/S0002337X23060106
EDN: https://elibrary.ru/ETRZNZ
ID: 140192

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Abstract
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Abstract

Using coprecipitation, we have synthesized LnVO4 (simple) and CaLnZr(VO4)3 (Ln = Nd, Sm, Eu, Gd, Dy, Yb) (ternary) lanthanide orthovanadates; a La0.3Nd0.5Sm0.1Eu0.1VO4 solid solution, modeling the composition of the lanthanides in radioactive waste (all crystallizing in the zircon structure, sp. gr. I41/amd); and LaVO4, crystallizing in the monazite structure. Their unit-cell parameters have been shown to increase systematically with increasing lanthanide ionic radius. Their mid- and far-IR vibrational spectra suggest that their symmetry is lower than that of classical zircon. The synthesized compounds are stable up to 900°C. Their average thermal expansion coefficients lie in the range (6–11) × 10–6 K–1.

Keywords

lanthanides, vanadates, zircon

References

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