Phase transitions in CuZrF/sub 6/ and CrZrF/sub 6/: a Mossbauer and EPR study of local and cooperative Jahn-Teller distortions

Journal Article · Tue Feb 01 04:00:00 EST 1983 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(83)90149-4· OSTI ID:5438642

Friebel, C; Pebler, J; Steffens, F; Weber, M; Reinen, D

CuZrF/sub 6/ and CrZrF/sub 6/ undergo phase transitions between 100 and 450K, which are induced by crystal packing effects and changes from dynamical to static Jahn-Teller distortions of the Cu(Cr)F/sub 6/ octahedra. We analyzed in particular the transitions of the Jahn-Teller type using /sup 57/Fe/sup 2 +/, doped into the Cu/sup 2 +/(Cr/sup 2 +/) sites, as a Mossbauer probe. The quadrupole splitting is large in the region of static distortions and essentially reflects the distortion symmetry of the host Cu(Cr)F/sub 6/ polyhedra, while it vanishes in the case of a dynamical Jahn-Teller effect. Ligand field, EPR, and magnetic data are given in addition and are discussed with respect to the structures of the host compounds and the cooperative Jahn-Teller order of the tetragonally elongated Cu(Cr)F/sub 6/ polyhedra in the low-temperature phases.

• Research Organization: Universitat Marburg, Lahnberge, West Germany
• OSTI ID: 5438642
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 46:2; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CHROMIUM COMPOUNDS
CHROMIUM FLUORIDES
COPPER COMPOUNDS
COPPER FLUORIDES
COPPER HALIDES
ELECTRON SPIN RESONANCE
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HIGH TEMPERATURE
LIGANDS
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
MEDIUM TEMPERATURE
MOESSBAUER EFFECT
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RESONANCE
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM FLUORIDES