Email this article Phase Formation in the TiO2–H2SO4–HF–Nd(NO3)3–H2O System at 20°C
- Authors: Godneva M.M.1, Rys’kina M.P.1, Mikhailova N.L.1, Kuznetsov V.Y.1
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Affiliations:
- Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center
- Issue: Vol 64, No 2 (2019)
- Pages: 262-269
- Section: Physicochemical Analysis of Inorganic Systems
- URL: https://journal-vniispk.ru/0036-0236/article/view/169255
- DOI: https://doi.org/10.1134/S0036023619020086
- ID: 169255
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Abstract
The phases NdF3 (I), x (II), NdTi2O4.75F0.5(SO4)0.5 · 3H2O (III), NdTiF3(SO4)2 · 6H2O (NdTiOF(SO4)2 · 6H2O) (IV), Nd2(SO4)3 · 8H2O (V), and Nd2(SO4)3 · 4H2O (VI) formed in sulfuric acid and fluorine-containing solutions during the synthesis of materials from feedstocks and the purification and separation of metals were separated. The regions of their existence were schematically presented. Particles with a “core-shell” structure were detected. The compounds were studied by elemental, crystallooptic, X-ray diffraction, and thermal analyses. The composition was determined for phase III (from thermogravimetric (TG) data) and spherolith-like particles of H6NdF7.8(SO4)0.5 · 3.75H2O (VII) (by X-ray diffraction microanalysis). Freshly separated particles evolved HF. Phase IV corresponding to NdTiF3(SO4)2 · 6H2O (according to TG data) acquired the composition and form of the known NdTiOF(SO4)2 · 6H2O phase after storage.
About the authors
M. M. Godneva
Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center
Author for correspondence.
Email: motov@chemy.kolasc.net.ru
Russian Federation, Akademgorodok, Apatity, Murmansk oblast, 184209
M. P. Rys’kina
Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center
Email: motov@chemy.kolasc.net.ru
Russian Federation, Akademgorodok, Apatity, Murmansk oblast, 184209
N. L. Mikhailova
Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center
Email: motov@chemy.kolasc.net.ru
Russian Federation, Akademgorodok, Apatity, Murmansk oblast, 184209
V. Ya. Kuznetsov
Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center
Email: motov@chemy.kolasc.net.ru
Russian Federation, Akademgorodok, Apatity, Murmansk oblast, 184209
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