Synthesis, structure and magnetic properties of honeycomb-layered LiCoSbO with new data on its sodium precursor, NaCoSbO
Li 3 Co 2 SbO 6 is prepared by molten salt ion exchange and its structure refined by the Rietveld method confirming the honeycomb-type Co/Sb ordering of its Na precursor. Monoclinic rather than trigonal symmetry of Na 3 Co 2 SbO 6 is directly demonstrated for the first time by peak splitting in the...
Gespeichert in:
Veröffentlicht in: | New journal of chemistry 2019-08, Vol.43 (34), p.13545-13553 |
---|---|
Hauptverfasser: | , , , , , , , |
Format: | Artikel |
Sprache: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | Li
3
Co
2
SbO
6
is prepared by molten salt ion exchange and its structure refined by the Rietveld method confirming the honeycomb-type Co/Sb ordering of its Na precursor. Monoclinic rather than trigonal symmetry of Na
3
Co
2
SbO
6
is directly demonstrated for the first time by peak splitting in the high-resolution synchrotron XRD pattern. The long-range antiferromagnetic order is established at
T
N
6.7 K and 9.9 K in Na
3
Co
2
SbO
6
and Li
3
Co
2
SbO
6
, respectively, confirmed by both the magnetic susceptibility and specific heat. Spin-wave analysis of specific heat data indicates the presence of 3D AFM magnons in Na
3
Co
2
SbO
6
and 2D AFM magnons in Li
3
Co
2
SbO
6
. The field dependence of the magnetization almost reaches saturation in moderate magnetic fields up to 9 T and demonstrates characteristic features of magnetic field induced spin-reorientation transitions for both A
3
Co
2
SbO
6
(A = Na, Li). Overall thermodynamic studies show that the magnetic properties of both compounds are very sensitive to an external magnetic field, thus predicting a non-trivial ground state with a rich magnetic phase diagram. The ground state spin configuration of Li
3
Co
2
SbO
6
has been determined by low-temperature neutron powder diffraction. It represents a ferromagnetic arrangement of moments in the honeycomb layers with antiferromagnetic coupling between adjacent layers.
Crystallographic and magnetic properties of new layered honeycomb-lattice Li
3
Co
2
SbO
6
antimonate were studied and compared with its sodium precursor Na
3
Co
2
SbO
6
. |
---|---|
ISSN: | 1144-0546 1369-9261 |
DOI: | 10.1039/c9nj03627j |