Abstract
Kinetic order-disorder phase transitions (space group space group \( I\bar 4 \) ↔ space group I41/a) have been considered for nonactivated and activated scheelite compounds (Na0.5Gd0.5)WO4 (NGW), (Na0.5Gd0.5)MoO4 (NGM), (Na0.5La0.5)WO4(NLW), and (Na0.5La0.5)MoO4 (NLM) synthesized by the Czochralski method and structural and growth sources of crystal dissymmetrization have been suggested. For NGW, it was shown that an increase in the difference between the content of Gd and Na in two positions of the structure with space group \( I\bar 4 \) and their ratio leads to an increase in the deviation from centrosymmetry. On the basis of available literature data and our results, it was demonstrated that the degree of order depends on the initial composition of the reaction mixture, crystal growth and cooling rates, activator concentrations, and postgrowth treatment conditions. The inconsistency between X-ray diffraction data and asynchronous second harmonic generation studies was explained by the possibility of formation of centrosymmetric superstructures and/or local ordering of atoms.
Similar content being viewed by others
References
V. K. Trunov, V. A. Efremov, and Yu. A. Velikodnyi, Crystal Chemistryt and Properties of Double molybdates and Tungstates (Nauka, Leningrad, 1986) [in Russian].
H. Li, G. Hong, and S. Yue, Zhongguo Xitu Xuebao 8, 37 (1990).
S. B. Stevens, C. A. Morrison, T. H. Allik, et al., Phys. Rev. B: Condens. Matter. 43(10), 7386 (1991).
R. G. Teller, Acta Crystallogr., Sect. C: Cryst. Struct. Commun. 48C, 2101 (1992).
G. M. Kuz’micheva, E. V. Zharikov, K. A. Subbotin, et al., Neorg. Mater. 41(9), 1133 (2005) [Inorg. Mater. 41 (9), 998 (2005)].
G. M. Kuz’micheva, A. V. Eremin, V. B. Rybakov, et al., Zh. Neorg. Khim. 54(6), 918 (2009) [Russ. J. Inorg. Chem. 54 (6), 854 (2009)].
Shigeomi Takai, Shinichi Touda, Kenichi Oikawa, et al., Solid State Ionics 148, 123 (2002).
Qisheng Lin, Xiqi Feng, and Jiutong Chen, J. Alloys Comp. 307, 245 (2000).
E. V. Zharikov, G. M. Kuz’micheva, D. A. Lis, et al., Neorg. Mater. 39(2), 200 (2003) [Inorg. Mater. 39 (2), 151 (2003)].
C. Cascales, M. D. Serrano, F. Esteban-Betegyn, et al., Phys. Rev. B: Condens. Matter 74, 174114–1 (2006).
E. I. Suvorova, G. M. Kuz’micheva, A. V. Morozkin, et al., Neorg. Mater. 42(2), 287 (2007) [Inorg. Mater. 42 (2), 287 (2007)].
G. M. Kuz’micheva, V. B. Rybakov, E. V. Zharikov, et al., Neorg. Mater. 42(2), 303 (2006) [Inorg. Mater. 42 (2), 303 (2006)].
A. Boultif and D. Louer, J. Appl. Crystallogr. 37, 724 (2004).
A. C. T. North, D. C. Phillips, and F. C. Mathews, Acta Crystallogr., Sect. A Found. Crystallogr. 24(3), 351 (1968).
L. J. Farrugia, J. Appl. Crystallogr. 32, 837 (1999).
G. M. Sheldrick, Acta Crystallogr. Sect. A Found. Crystallogr. 64, 112 (2008).
D. N. Nikogosyan, Nonlinear Optical Crystals: A Complete Survey, Springer Handbook of Condenced Matter and Materials Data (Springer, Berlin, 2005).
A. A. Chernov, Usp. Fiz. Nauk 100, 277 (1970).
A. Putnis and J. D. C. McConnell, Principles of Mineral Behaviour (Blackwell, Oxford, 1980).
Author information
Authors and Affiliations
Additional information
Original Russian Text © G.M. Kuz’micheva, V.B. Rybakov, V.L. Panyutin, E.V. Zharikov, K.A. Subbotin, 2010, published in Zhurnal Neorganicheskoi Khimii, 2010, Vol. 55, No. 9, pp. 1534–1539.
Rights and permissions
About this article
Cite this article
Kuz’micheva, G.M., Rybakov, V.B., Panyutin, V.L. et al. Symmetry of (Na0.5R0.5)MO4 crystals (R = Gd, La; M = W, Mo). Russ. J. Inorg. Chem. 55, 1448–1453 (2010). https://doi.org/10.1134/S0036023610090196
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0036023610090196