Single crystal Na 2 Co 2 TeO 6 has been successfully grown by self-flux method, and its lattice structure and basic magnetic properties were characterized. As determined by single crystal X-ray diffraction, Na 2 Co 2 TeO 6 belongs to space group P6 3 2 2 (182) with a = b = 5.2709(2) Å, c = 11.2615(15) Å, and V = 270.95 (4) Å 3 , the crystal structure is a layered honeycomb formed by CoO 6 octahedra and the TeO 6 octahedra in the center of the honeycomb layers, and the NaO 6 octahedra are between the honeycomb layers. Magnetic susceptibility measurements indicate that the single crystal sample displays a distinct anisotropic behavior and the spin parallels the honeycomb plane (ab-plane). In a lower temperature region, a series of antiferromagnetic-like (AFM-like) phase transitions were observed, which may result from the spin reorientation of Co 2+ ions. The different magnetization behavior between the polycrystalline structure and the single crystal (with the magnetic field parallel to and perpendicular to the ab-plane) reveals obvious magnetic anisotropy of single crystal Na 2 Co 2 TeO 6 . The special honeycomb planes formed by CoO 6 octahedra and the AFM interaction inter-and intra-honeycomb planes may lead to the obvious anisotropy and complicated magnetic phase transitions.
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