Polymorphism of ErF/sub 3/ and position of a third morphotropic transition in the lanthanide trifluoride series

Journal Article · Sun Aug 01 04:00:00 EDT 1976 · Mater. Res. Bull.; (United States)

DOI:https://doi.org/10.1016/0025-5408(76)90176-8· OSTI ID:7135452

Sobolev, B P ^[1]; Ratnikova, I D; Fedorov, P P; Sinitsyn, B V; Shahkalamyan, G S

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1. Inst. of Crystallography, Moscow

Phase transitions in HoF/sub 3/ and ErF/sub 3/ single crystals have been investigated using the method of thermal analysis. The oxygen content was checked at all stages of experiment, being not in excess of 0.004 wt percent. It is shown that with the indicated amount of oxygen impurity ErF/sub 3/ can be obtained in the form of large single crystals, in spite of the polymorphous transition 23/sup 0/C below the melting point. A study of the phase diagram of the HoF/sub 3/-ErF/sub 3/ system confirms the conclusion that the position of the morphotropic transition from orthorhombic over the whole temperature range LnF/sub 33/ (type beta-YF/sub 3/) to dimorphous ones (type alpha-YF/sub 3/ and beta-YF/sub 3/) occurs between HoF/sub 3/ and ErF/sub 3/.

• OSTI ID: 7135452
• Journal Information: Mater. Res. Bull.; (United States), Journal Name: Mater. Res. Bull.; (United States) Vol. 11:8; ISSN MRBUA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIAGRAMS
ERBIUM COMPOUNDS
ERBIUM FLUORIDES
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HOLMIUM COMPOUNDS
HOLMIUM FLUORIDES
MONOCRYSTALS
ORTHORHOMBIC LATTICES
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
RARE EARTH COMPOUNDS
THERMAL ANALYSIS