Abstract
Potassium and rare-earth (Eu, Sm, Yb, Ce) silicate and aluminosilicate crystals are hydrothermally synthesized under isothermal conditions at 500°C and a pressure of 100 MPa. The chemical and structural formulas of the synthesized compounds HK6Eu[Si10O25], K7Sm3[Si12O32], K2Sm[AlSi4O12] · 0.375H2O, K4Yb2[Si8O21], and K4Ce2[Al2Si8O24] are determined. In addition, a synthesis product with Eu, in which the dominant phase is assumed to be K3Eu3+[Si6O15] · 2H2O, is studied. The oxidation state of lanthanides in the silicates under study is determined based on X-ray absorption near-edge structure spectroscopy. The Eu L 3-, Sm L 3-, Yb L 3-, and Ce L 3-edge X-ray absorption spectra of the studied silicates and reference samples are recorded using a Rigaku R-XAS laboratory spectrometer. As reference samples, Eu2+S, Eu3+F3, Eu 3+2 O3, Sm 3+2 O3, Yb 3+2 O3, Yb3+F3, Yb3+Cl3, Ce 3+2 O3, and Ce4+O2 are used. Comparison of the absorption edge energies of lanthanide silicates and reference samples shows that Eu, Sm, Yb, and Cе in all the samples studied are in the oxidation state 3+. The synthesized silicates will supplement our knowledge of possible rare-earth minerals existing in hydrothermal systems, which is important for analyzing the distribution spectra of rare elements, which are widely used for diagnostics of geochemical processes and determination of sources of ore materials.
Similar content being viewed by others
References
Geochemistry and Mineralogy of Rare Earth Elements. Reviews in Mineralogy, Ed. by B. R. Lipin and G. A. McKay (Book Crafters, Inc., Cheilsea, Michigan, 2006), Vol. 21, pp. 1–348.
S. A. Repina, Geokhim., No. 9, 919 (2011).
S. M. Aksenov, R. K. Rastsvetaeva, V. A. Rassylov, N. B. Bolotina, V. K. Taroev, and V. L. Tauson, Micropor. Mesopor. Mater. 182, 95 (2013).
L. Suvorova, V. Taroev, A. Kashaev, A. Vasiljv, T. Malcherec, and J. Goettlicher, in Proceedings of the 3rd Conference on X-ray Analysis (Ulaanbaatar Univ. Press, 2012), p. 143.
S. M. Aksenov, V. A. Rassulova, R. K. Rastsvetaeva, and V. K. Taroev, Crystallogr. Rep. 58 (6), 835 (2013).
R. K. Rastsvetaeva, S. M. Aksenov, and V. K. Taroev, Crystallogr. Rep. 55 (6), 1012 (2010).
A. A. Kashaev and A. N. Sapozhnikov, Kristallografiya 23 (5), 956 (1978).
A. A. Kashaev, Dokl. Akad. Nauk SSSR 293 (6), 1468 (1987).
G. Bunker, Introduction to XAFS: A Practical Guide to X-ray Absorption Fine Structure Spectroscopy (Cambridge Univ. Press, 2011).
A. V. Soldatov, Zh. Strukt. Khim. 49, 111 (2008).
A. V. Soldatov, G. Yu. Smolentsev, A. N. Kravtsova, V. L. Mazalova, I. E. Shtekhin, and T. S. Belikova, Zavod. Lab., Diagn. Mater. 74 (10), 28 (2008).
N. D. Tailby, A. M. Walker, A. J. Berry, J. Hermann, K. A. Evans, J. A. Mavrogenes, H. St. C. O’Neill, I. S. Rodina, A. V. Soldatov, D. Rubatto, and S. R. Sutton, Geochim. Cosmochim. Acta 75, 905 (2011).
I. S. Rodina, A. N. Kravtsova, M. A. Soldatov, A. V. Soldatov, and A. J. Berry, J. Phys.: Conf. Ser. 190, 012181 (2009).
I. S. Rodina, A. N. Kravtsova, A. V. Soldatov, and A. Dzh. Berri, Opt. Spectrosc. 111 (6), 936 (2011).
I. S. Rodina, A. N. Kravtsova, A. V. Soldatov, G. E. Yalovega, Yu. V. Popov, and N. I. Boiko, Opt. Spectrosc. 115 (6), 856 (2013).
http://nanospectr.sfedu.ru.
http://nano.sfedu.ru/ckp_r.html.
V. B. Nalbandyan, E. A. Zvereva, G. E. Yalovega, I. L. Shukaev, A. P. Ryzhakova, A. A. Guda, A. Stroppa, S. Picozzi, A. N. Vasiliev, and M.-H. Whangbo, Inorg. Chem. 52 (20), 11850 (2013).
M. A. Evsyukova, G. Yalovega, A. Balerna, A. P. Menushenkov, Ya. V. Rakshun, and A. A. Teplov, Physica B 405, 2122 (2010).
G. V. Fetisov, Synchrotron Radiation: Methods of Investigation of the Structure of Compounds (Fizmatlit, Moscow, 2007) [in Russian].
Procedure of determination of the oxidation state of atoms in nanomaterials based on the X-ray absorption spectroscopy (document MVI 13–2009). The procedure was developed by Southern Federal University and certified by Federal State Establishment “Rostov Center of Standardization, Metrology and Certification” of Federal Agency for Technical Regulation and Metrology (certificate No. 13/2009 from 09.12.2009).
Y. Takahashi, G. R. Kolonin, G. P. Shironosova, I. I. Kupriyanova, T. Uruga, and H. Shimizu, Mineralog. Mag. 69 (2), 179 (2005).
T. Yamamoto and A. Yukumoto, Bunseki Kagaku 62 (6), 555 (2013).
J. Pellicer-Porres, A. Segura, G. Martinez-Criado, U. R. Rodriguez-Mendoza, and V. Lavin, J. Phys.: Condens. Matter 25, 025303 (2013).
H. Yamaoka, M. Taguchi, A. M. Vlaicu, H. Oohashi, K. Yokoi, D. Horiguchi, T. Tochio, Y. Ito, K. Kawatsura, K. Yamamoto, A. Chainani, S. Shin, M. Shiga, and H. Wada, J. Phys. Soc. Jap. 75 (3), 034702 (2006).
T. Yamamoto, T. Matsuyama, T. Tanaka, T. Funabiki, and S. Yoshida, Phys. Chem. Chem. Phys. 1, 2841 (1999).
H. Zao, J. Hu, Q. Zhang, J. Bao, W. Liu, Ch. Gao, and Y. Luo, J. Appl. Polym. Sci. 100, 1294 (2006).
I. Narai-Sabo, Inorganic Crystallochemistry (Izdatel’stvo Akademii Nauk Vengrii, Budapest, 1969).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © A.N. Kravtsova, A.A. Guda, A.V. Soldatov, J. Goettlicher, V.K. Taroev, A.A. Kashaev, L.F. Suvorova, V.L. Tauson, 2015, published in Optika i Spektroskopiya, 2015, Vol. 119, No. 6, pp. 975–980.
Rights and permissions
About this article
Cite this article
Kravtsova, A.N., Guda, A.A., Soldatov, A.V. et al. X-ray spectral diagnostics of synthetic lanthanide silicates. Opt. Spectrosc. 119, 982–986 (2015). https://doi.org/10.1134/S0030400X15110156
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0030400X15110156