Impact of fluoride for hydroxide substitution on the magnetic properties of a Co-based single-ion magnet imbedded in the barium apatite crystal lattice

Mikhail A. Zykin, Artem A. Eliseev, Mariam A. Pogosova, Lev A. Trusov, Walter Schnelle, Claudia Felser, Martin Jansen, Pavel E. Kazin

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Cobalt-containing barium fluoro/hydroxy-apatites were prepared by a high-temperature solid state reaction in air. Cobalt ions are partially located in the trigonal channels of the apatite lattice, formally substituting the protons of hydroxide groups. The samples exhibit single-ion magnet features-slow relaxation of magnetization up to 40 K with parameters close to those in the parent cobalt-containing barium hydroxyapatite. A partial fluoride for hydroxide substitution (40%) facilitates the formation of the apatite phase, while the energy barrier for magnetization reversal retains its high value of 326 cm −1 and the irreversibility in low temperature magnetization is substantially increased. The 90% substitution results in the full disappearance of the high-energy single-ion magnetic centers, and the magnetic behavior suggests the presence of a high-spin cobalt ion in the +4 oxidation state.

Original languageEnglish
Pages (from-to)1193-1199
Number of pages7
JournalCrystEngComm
Volume21
Issue number7
DOIs
Publication statusPublished - 2019

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