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  Slow Spin Relaxation in Dioxocobaltate(II) Anions Embedded in the Lattice of Calcium Hydroxyapatite

Zykin, M. A., Babeshkin, K. A., Magdysyuk, O. V., Anokhin, E. O., Schnelle, W., Felser, C., et al. (2017). Slow Spin Relaxation in Dioxocobaltate(II) Anions Embedded in the Lattice of Calcium Hydroxyapatite. Inorganic Chemistry, 56(22), 14077-14083. doi:10.1021/acs.inorgchem.7b02237.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-9FCB-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-9FD9-E
Genre: Journal Article

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 Creators:
Zykin, Mikhail A.1, Author
Babeshkin, Konstantin A.1, Author
Magdysyuk, Oxana V.1, Author
Anokhin, Evgeny O.1, Author
Schnelle, Walter2, Author              
Felser, Claudia3, Author              
Jansen, Martin4, Author              
Kazin, Pavel E.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              
4Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              

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 Abstract: Pure-phase cobalt-doped calcium hydroxyapatite ceramic samples with composition Ca-10(PO4)(6)[(CoO2) (OH)(1-2x)](2), where x = 0-0.2, were synthesized by high-temperature solid-state reaction, and their crystal structures, vibrational spectra, and magnetic properties were studied. Co atoms are found to enter into the apatite trigonal channel formally substituting H atoms and forming bent dioxocobaltate(II) anions. The anion exhibits single molecule-magnet (SMM) behavior: slow relaxation of magnetization below 8 K under a nonzero magnetic field with an energy barrier of 63 cm(-1). The barrier value does not depend on the concentration of Co ions, virtually coincides with the zero-field-splitting energy as determined from direct-current magnetization, and is very close to the value obtained earlier for cobalt doped strontium hydroxyapatite. Moreover, the vibration frequencies of the dioxocobaltate(II) anion are found to be the same in calcium and strontium apatite matrixes. The very weak dependence of the SMM parameters on the matrix nature in combination with good chemical and thermal stabilities of the compounds provides wide opportunities to exploit the intrinsic properties of such a SMM-like anion.

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Language(s): eng - English
 Dates: 2017-11-072017-11-07
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1021/acs.inorgchem.7b02237
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Title: Inorganic Chemistry
  Abbreviation : Inorg. Chem.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 56 (22) Sequence Number: - Start / End Page: 14077 - 14083 Identifier: ISSN: 0020-1669
CoNE: https://pure.mpg.de/cone/journals/resource/0020-1669