High-pressure phase transitions in transition-metal trifluorides

Journal Article · Fri Mar 01 04:00:00 EST 1985 · Inorg. Mater. (Engl. Transl.); (United States)

OSTI ID:6323379

Bendeliani, N A

This paper reports on studies which have resulted in data on the phase transformations of transition-metal trifluorides at normal and elevated pressures which have been used in the construction of generalized p-T phase diagrams. These phase diagrams enable the forecast of the behavior of the required phases, in particular, of systems in response to pressure and temperature. Possible behavior of these compounds under pressure include: the melting points of modifications with comparatively open structures of type ..cap alpha..-UO/sub 3/ should fall on compression, while those of modifications with structures of ..beta..-YF/sub 3/ and tysonite types should increase; the anomalous course of the melting curves for the ..cap alpha.. phases provides expansion of their stability regions on the p-T diagrams on going to the trifluorides of elements with smaller ionic radii; and the maximum entropy occurs in the solid phases for the ..cap alpha.. state.

• Research Organization: Inst. of High-Pressure Physics, Academy of Sciences of the USSR
• OSTI ID: 6323379
• Journal Information: Inorg. Mater. (Engl. Transl.); (United States), Journal Name: Inorg. Mater. (Engl. Transl.); (United States) Vol. 20:10; ISSN INOMA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CRYSTAL-PHASE TRANSFORMATIONS
DIAGRAMS
ENTROPY
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
MELTING
PHASE DIAGRAMS
PHASE STUDIES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRESSURE EFFECTS
TEMPERATURE EFFECTS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS