Abstract
Nanostructuring in fluorite-like Ca1 − x La x F2 + x is shown to be associated with the precipitation of an CuAu-ordered phase. The shape of the precipitates is governed by the energetics of the {001} and {111} faces of tetragonal inclusions in highly anisotropic media and is nearly cuboctahedral. The misfit strain relaxes through the generation of twins, which nucleate along the intersection lines of {001} and {111} faces. The twins impede facial development and further growth and ordering of precipitates, thereby freezing the precipitation process in its initial stage. For this reason, the phase segregation is difficult to reveal, and Ca1 − x La x F2 + x crystals appear homogeneous.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Adams, D.M., Inorganic Solids: An Introduction to Concepts in Solid-State Structural Chemistry, London: Wiley, 1974.
Sobolev, B.P., The Rare Earth Trifluorides: Part I. The High Temperature Chemistry of the Rare Earth Trifluorides, Barcelona: Inst. d’Estudis Catalans, 2001.
Tret’yakov, Yu.D., Khimiya nestekhiometricheskikh oksidov (Chemistry of Nonstoichiometric Oxides), Moscow: Mosk. Gos. Univ., 1974.
Maksimov, S.K., Avilov, A.S., Sobolev, B.P., and Herrero, P., Anomalies of Properties and Structure of M1 − x R x F2 + x Crystals, Proc. 5th Int. Conf. Single Crystal Growth and Heat & Mass Transfer, Obninsk, 2003, vol. 2, pp. 379–388.
Maksimov, S.K., Nanostructuring of Nonstoichiometric Ba1 − x La x F2 + x , Izv. Vyssh. Uchebn. Zaved., Elektron., 2006, no. 5, pp. 7–12.
Hirsch, P.B., Howie, A., Nicholson, R.B., et al., Electron Microscopy of Thin Crystals, London: Butterworths, 1965.
Krivoglaz, M.A. and Smirnov, A.F., Teoriya uporyadochivayushchikhsya splavov (Theory of Ordering Alloys), Moscow: Fizmatgiz, 1958.
Watanabe, C., Monzen, R., Nagayoshi, H., and Onaka, S., Elastic State of Rod-Shaped Ag Precipitates in a Cu-5.7 wt% Ag Single Crystal, Philos. Mag. Lett., 2006, vol. 86, pp. 65–73.
Sankarasubramanian, R., Jog, C.S., and Abinandanan, T.A., Symmetry-Breaking Transitions in Equilibrium Shapes of Coherent Precipitates: Effect of Elastic Anisotropy and Inhomogeneity, Metall. Trans. A, 2002, vol. 33, no. 4, pp. 1083–1090.
Shutilov, V.A., Osnovy fiziki ul’trazvuka (Fundamentals of Ultrasound Physics), Leningrad: Leningr. Gos. Univ., 1980.
Sobolev, B.P., Golubev, A.M., Krivandina, E.A., et al., Ba1 − x R x F2 + x (R = Gd-Lu) Distorted Fluorite Phases Prepared from Incongruent BaF2-RF3 Melts: I. Preparation and Some Properties of Ba0.75R0.25F2.25 Crystals, Kristallografiya, 2002, no. 2, pp. 237–248.
Author information
Authors and Affiliations
Additional information
Original Russian Text © S.K. Maksimov, K.S. Maksimov, 2007, published in Neorganicheskie Materialy, 2007, Vol. 43, No. 5, pp. 626–631.
Rights and permissions
About this article
Cite this article
Maksimov, S.K., Maksimov, K.S. Mechanism of nanostructuring in fluorite-like Ca1 − x La x F2 + x . Inorg Mater 43, 551–556 (2007). https://doi.org/10.1134/S0020168507050202
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1134/S0020168507050202