BEHAVIOR OF IRON, COBALT AND NICKEL FLUOSILICATE HEXAHYDRATES UNDER PRESSURE

S K  Asadov; E A  Zavadskii; V I  Kamenev; K V  Kamenev; B M  Todris

BEHAVIOR OF IRON, COBALT AND NICKEL FLUOSILICATE HEXAHYDRATES UNDER PRESSURE

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

School of Engineering

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

The effect of hydrostatic pressure up to 120 MPa on the stability boundaries 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 language	English
Pages (from-to)	167-172
Number of pages	6
Journal	Physical review B
Volume	182
Issue number	2
Publication status	Published - Oct 1992

Keywords / Materials (for Non-textual outputs)

ORIENTATIONAL PERIODIC ANTIPHASE
PHASE-TRANSFORMATION
X-RAY

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title = "BEHAVIOR OF IRON, COBALT AND NICKEL FLUOSILICATE HEXAHYDRATES UNDER PRESSURE",

abstract = "The effect of hydrostatic pressure up to 120 MPa on the stability boundaries 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.",

keywords = "ORIENTATIONAL PERIODIC ANTIPHASE, PHASE-TRANSFORMATION, X-RAY",

author = "Asadov, {S K} and Zavadskii, {E A} and Kamenev, {V I} and Kamenev, {K V} and Todris, {B M}",

year = "1992",

month = oct,

language = "English",

volume = "182",

pages = "167--172",

journal = "Physical review B",

issn = "1098-0121",

publisher = "American Physical Society",

number = "2",

}

TY - JOUR

T1 - BEHAVIOR OF IRON, COBALT AND NICKEL FLUOSILICATE HEXAHYDRATES UNDER PRESSURE

AU - Asadov, S K

AU - Zavadskii, E A

AU - Kamenev, V I

AU - Kamenev, K V

AU - Todris, B M

PY - 1992/10

Y1 - 1992/10

N2 - The effect of hydrostatic pressure up to 120 MPa on the stability boundaries 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.

AB - The effect of hydrostatic pressure up to 120 MPa on the stability boundaries 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.

KW - ORIENTATIONAL PERIODIC ANTIPHASE

KW - PHASE-TRANSFORMATION

KW - X-RAY

M3 - Article

SN - 1098-0121

VL - 182

SP - 167

EP - 172

JO - Physical review B

JF - Physical review B

IS - 2

ER -

BEHAVIOR OF IRON, COBALT AND NICKEL FLUOSILICATE HEXAHYDRATES UNDER PRESSURE

Abstract / Description of output

Keywords / Materials (for Non-textual outputs)

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