Behaviour of iron, cobalt and nickel fluosilicate hehahydrates under pressure

S. K. Asadov, E. A. Zavadskii*, V. I. Kamenev, K. V. Kamenev, B. M. Todris

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The effect of hydrostatic pressure up to 120MPa on the stability boudaries of crystalline phases and phase transition behaviour observed in MSiF6·6H2O (M = Fe, Co, Ni) in the temperature range 20-300 K, is studied by X-ray diffractometry and the differential thermal analysis technique. Existence of critical pressures and the destabilization of the low-temperature monoclinic phase in FeSiF6·6H2O and CoSiF6·6H2O are established. P-T diagrams of the investigated fluosilicate hexahydrates showing the unique variety of phases and phase transitions are plotted. It is shown that the P-T phase diagram of crystalline states NiSiF6·6H2O has the same form as the diagram region CoSiF6·6H2O corresponding to pressures which exceed the critical pressure for the stability of the monoclinic phase.

Original languageEnglish
Pages (from-to)167-172
Number of pages6
JournalPhysica B: Physics of Condensed Matter
Volume182
Issue number2
DOIs
Publication statusPublished - Oct 1992

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