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Вид документа : Статья из журнала
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Автор(ы) : Bogdanov E. V., Mel'nikova S. V., Pogoreltsev E. I., Molokeev M. S., Flerov I. N.
Заглавие : The structure and phase transitions in oxyfluoride (ND4)2MoO2F4
Место публикации : Solid State Sci.: Elsevier, 2016. - Vol. 61. - P.155-160. - ISSN 12932558 (ISSN), DOI 10.1016/j.solidstatesciences.2016.08.012
Примечания : Cited References: 18. - The authors are grateful to A.G. Kocharova for the synthesis and deuteration of the samples, and to A.A. Sukhovsky and Y.N. Ivanov for the execution of NMR studies to determine the degree of sample deuteration.This study was partially supported by Russian Foundation for Basic Research, project No. 16–32–00201 mol_а.
Ключевые слова (''Своб.индексиров.''): deuterium--heavy water--single crystals--x ray analysis--crystal phasis--deuterations--distorted phasis--oxyfluorides--polarization optics--scanning microcalorimetry--tricritical point--molybdenum oxide
Аннотация: Single crystals of (ND4)2MoO2F4 containing 95% deuterium were produced by repeated recrystallization of (NH4)2MoO2F4 in heavy water. The effect of deuteration on the parameters of successive phase transitions was investigated by differential scanning microcalorimetry and polarization optics. X-ray analysis of the original and distorted phases was performed. It was found that deuteration does not change the sequence of crystal phases typical for (NH4)2MoO2F4, but leads to a shift in the phase transition Cmcm Pnma towards the tricritical point. The mechanism of phase transitions in (ND4)2MoO2F4 was associated with both the ordering and the displacement of atoms. © 2016 Elsevier Masson SAS
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