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Updated: Jun 27, 2025
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Novel ternary AgIICoIIIF5 fluoride: synthesis, structure and magnetic characteristics
Daniel Jezierski1, Zoran Mazej2, Wojciech Grochala1
1Center of New Technologies, University of Warsaw, 02089 Warsaw, Poland. d.jezierski@cent.uw.edu.pl.
Abstract:
We present a new compound in the silver-cobalt-fluoride system, featuring paramagnetic silver (d9) and high-spin cobalt (d6), synthesized by solid-state method in an autoclave under F2 overpressure. Based on powder X-ray diffraction, we determined that AgIICoIIIF5 crystallizes in a monoclinic system with space group C2/c. The calculated fundamental band-gap falls in the visible range of the electromagnetic spectrum, and the compound has the character of charge-transfer insulator. AgCoF5 is likely a ferrimagnet with one predominant superexchange magnetic interaction constant between mixed spin cations (Ag-Co) of -62 meV (SCAN result). Magnetometric measurements conducted on a powdered sample allowed the identification of a transition at 128 K, which could indicate magnetic ordering.
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