Abstract
In this study, the first of the proposed cycle, the conditions and the mechanism of nucleation and formation of particles of the Pb2MoO5 phase in PbMoO4 crystals, which are due to the physicochemical features of the heating, melting, and solidification of PbMoO4, are considered. It is shown that preferred evaporation of one of the composite components of this compound, MoO3, leads to the violation of the initial stoichiometry and formation of excess PbO in a charge at the synthesis stage and in a melt during the crystal growth. The formation of the Pb2MoO5 phase in crystals with excess PbO occurs during their postgrowth cooling at temperatures below 930°C (eutectics between PbMoO4 and Pb2MoO5). The results of the differential thermal analysis, X-ray diffraction analysis, high-temperature powder diffraction study, and annealing of crystals in specific media confirm the solid-state mechanism of the formation of the Pb2MoO5 phase in PbMoO4 crystals.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
S. K. Filatov, High-Temperature Crystal Chemistry (Nedra, St. Petersburg, 1990) [in Russian].
E. K. Kazenas and D. M. Chizhikov, Pressure and Composition of Vapor over Oxides of Chemical Elements (Nauka, Moscow, 1976), p. 108 [in Russian].
I. F. Kononyuk, V. A. Shnyp, and M. I. Borisyuk, Izv. Akad. Nauk SSSR, Neorg. Mater. 5(8), 1422 (1969).
A. N. Zobnina and I. P. Kislyakov, Izv. Akad. Nauk SSSR, Neorg. Mater. 2(12), 2199 (1966).
A. N. Zobnina, S. I. Kopeikin, and I. P. Kislyakov, Izv. Akad. Nauk SSSR, Neorg. Mater. 8(12), 2149 (1972).
Zh. G. Bazarova, M. V. Mokhosoev, É. A. Kirillov, and K. N. Fedorov, Izv. Akad. Nauk SSSR, Neorg. Mater. 14(8), 1504 (1979).
T. M. Yanushkevich, Candidate’s Dissertation in Chemistry (Ural State Univ., Sverdlovsk, 1973).
Ye. V. Tkachenko, L. M. Fedorova, V. T. Gabrielyan, et al., Main Regularities of Three-Phase Interaction of PbO and MoO 3, Available from ONIITÉKhIM, No. 3278/79 (Cherkassy, 1980).
Ye. V. Tkachenko, L. M. Fedorova, V. T. Gabrielyan, et al., Zh. Neorg. Khim. 25(6), 1443 (1980).
L. M. Fedorova, Candidate’s Dissertation in Chemistry (Ural State Univ., Sverdlovsk, 1983).
A. V. Denisov, V. T. Gabrielyan, O. S. Grunskii, and E. N. Kotel’nikova, in Proceedings of International Conference on Crystallogenesis and Mineralogy (St. Petersburg, 2001), p. 88.
P. P. Budnikov and A. M. Ginstling, Reactions in Solid Mixtures (Stroiizdat, Moscow, 1971) [in Russian].
V. T. Gabrielyan, L. M. Feodorova, Ye. V. Tkachenko, et al., Cryst. Res. Technol. 21(4), 439 (1986).
Author information
Authors and Affiliations
Additional information
__________
Translated from Kristallografiya, Vol. 50, No. 2, 2005, pp. 363–371.
Original Russian Text Copyright © 2005 by Gabrielyan, Grunski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\), Gukasov, Denisov, Nikogosyan, Fedorova.
Rights and permissions
About this article
Cite this article
Gabrielyan, V.T., Grunskii, O.S., Gukasov, A.A. et al. Physical and physicochemical processes accompanying powder synthesis, growth of PbMoO4 crystals, and their annealing in various media: I. Solid-state mechanism of the formation of the Pb2MoO5 microheterogeneous phase in PbMoO4 crystals. Crystallogr. Rep. 50, 327–334 (2005). https://doi.org/10.1134/1.1887909
Received:
Issue Date:
DOI: https://doi.org/10.1134/1.1887909