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Название: 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
Автор: Gabrielyan, V. T.
Grunskiǐ, O. S.
Gukasov, A. A.
Denisov, A. V.
Nikogosyan, N. S.
Fedorova, L. M.
Дата публикации: 2005
Издатель: Pleiades Publishing Ltd
Аннотация: In this study, the first of the proposed cycle, the conditions and the mechanism of nucleation and formation of particles of the Pb2MoO 5 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. © 2005 Pleiades Publishing, Inc.
Ключевые слова: ANNEALING
CRYSTAL GROWTH
CRYSTALS
MATHEMATICAL MODELS
PHASE TRANSITIONS
PHOTOLUMINESCENCE
SOLIDIFICATION
STOICHIOMETRY
X RAY DIFFRACTION
INTENSIVE MELT EVAPORATION
PHASE FORMATION
POSTGROWTH COOLING
SYNTHESIS STAGES
LEAD COMPOUNDS
ISSN: 1063-7745
1562-689X
DOI: 10.1134/1.1887909
SCOPUS: 17544361845
WoS: 000228424200021
Располагается в коллекциях:Научные публикации, проиндексированные в SCOPUS и WoS

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