Raman spectroscopic study of non‐stoichiometry in cerianite from critical zone

Raman spectroscopic study of non‐stoichiometry in cerianite from critical zone Full article

Journal

Journal of Raman Spectroscopy
ISSN: 0377-0486 , E-ISSN: 1097-4555

Output data

Year: 2023, Volume: 54, Number: 11, Pages: 1191-1200 Pages count : 10 DOI: 10.1002/jrs.6557

Authors

Zhukova Irina A. ¹ , Stepanov Aleksandr S. ¹ , Malyutina Alexandra ² , Doroshkevich Anna G. ² , Korsakov Andrey V. ² , Jiang Shao‐Yong ¹ , Bakovets Vladimir V. ³ , Pomelova Tatyana A. ³ , Nigmatulina Elena N. ²

Affiliations

1	State Key Laboratory of Geological Processes and Mineral Resources, Collaborative Innovation Center for Exploration of Strategic Mineral Resources, School of Earth Resources China University of Geosciences, Wuhan, China
2	V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russian Federation
3	Nikolaev Institute of Inorganic Chemistry, Russian Academy of Sciences, Novosibirsk, Russian Federation

Cerianite (CeO2) is one of the key minerals controlling the behavior of rare earth elements (REE) in supergene environment, yet little is known about the composition and structure of the mineral. We present Raman spectroscopy and compositional data on regolith cerianite from carbonatite-related supergene REE deposits. Cerianite showed a low content of impurities, distinguishing from high-temperature environments, where the mineral is characterized by elevated concentrations of lanthanides other than Ce. The Raman spectra are characterized by the shift of the dominant peak located at 464–465 cm−1 in stoichiometric CeO2 to the lower wavenumbers of 450–455 cm−1, the widening of this peak with the increasing shift, and the presence of additional peaks at 225–230, 284, and 604–613 cm−1. The independence of the main spectral characteristics from the laser wavelength (tested by three lasers: 488, 532, and 633 nm) suggests that the features are genuine and not produced by REE luminescence. The anhydrous composition of supergene cerianite is indicated by the absence of Raman bands in the water-bearing region of the spectra (2700–3200 cm−1). The spectral features of supergene cerianite, combined with the compositional data, suggest non-stoichiometry in the mineral and the presence of Ce3+ with oxygen vacancies in the mineral structure. Our observations demonstrate the efficiency of Raman spectroscopy for the identification of the non-stoichiometric composition of cerianite and its common occurrence in the critical zone.

Zhukova I.A. , Stepanov A.S. , Malyutina A. , Doroshkevich A.G. , Korsakov A.V. , Jiang S. , Bakovets V.V. , Pomelova T.A. , Nigmatulina E.N.
Raman spectroscopic study of non‐stoichiometry in cerianite from critical zone
Journal of Raman Spectroscopy. 2023. V.54. N11. P.1191-1200. DOI: 10.1002/jrs.6557 WOS Scopus OpenAlex

Submitted:	Oct 21, 2022
Accepted:	May 15, 2023
Published online:	May 31, 2023
Published print:	Nov 2, 2023

Web of science:	WOS:000998920400001
Scopus:	2-s2.0-85161469369
OpenAlex:	W4378800536

DB	Citing
Web of science	1
Scopus	2
OpenAlex	2