Magnetic properties of honeycomb spin lattice compounds Na2M2TeO6 (M = Co, Ni) and spin dimer compound Na2Cu2TeO6 single crystals by flux-growth

Hydrothermal Synthesis of Ni3TeO6 and Cu3TeO6 Nanostructures for Magnetic and Photoconductivity Applications

“…The NTO_CP sample (Figure a) presents mainly the characteristic peaks of the phase Ni 3 TeO 6 . However, in this methodology is also observed a peak at 2θ = 18.46°, indicating that Na has been incorporated in the crystalline structure of Ni 3 TeO 6 forming the crystal phase Na 2 Ni 2 TeO 6 (PDF 00-058-0052), as it was observed previously in the literature for materials synthesized by solid-state methodology. , This effect is also observed in CTO_CP (see Figure b), where the material, prepared by coprecipitation, shows the characteristic peak (2θ = 18.94°) of the crystalline metal tellurate Na 2 Cu 2 TeO 6 (PDF 04-011-7562). This evidence makes clear that the co-precipitation approach at pH = 7 using NaOH favors the incorporation of Na in the crystal structure of the metal tellurates forming multiphase compounds.…”

Magnetic Properties and Phase Diagram of the Honeycomb Layered Na2Ni2TeO6 Single Crystal under a High Magnetic Field

“…Figure 1b shows the XRD and refinement diffraction patterns of Na 2 Ni 2 TeO 6 polycrystalline powder (crushed by single-crystal samples). Based on the refinement, of the structure parameters observed were a = b = 5.20509 (27) Å, c = 11.1419(8) Å, and V = 261.428(27) Å 3 , which are consistent with a previous report. 22 Diffraction peaks indexed by P63/mcm indicate that all the samples are single phase crystallized with a hexagonal structure, and the synthesized single-crystal samples have a complete cleavage plane without detectable impurities.…”

“…Based on the polycrystalline samples, single-crystal samples were grown. Na 2 Ni 2 TeO 6 single crystals were grown using a self-flux method, , in which the Na 2 Ni 2 TeO 6 polycrystalline samples with a stoichiometric amount flux Na 2 O and TeO 2 were mixed thoroughly, then sintered at 900 °C for 30 h, and then cooled from 900 to 500 °C at a cooling rate of 3 °C/h. The crystal structure was determined by X-ray diffraction (XRD), low-field magnetization measurements were completed by a Superconducting Quantum Interference Device (SQUID) magnetometer, and high-field magnetizations were carried under pulsed high magnetic fields at the Wuhan pulsed high magnetic field center with the maximum magnetic field up to 56 T and the lowest temperature down to 2 K.…”

Antiferromagnetic ordering and signatures of enhanced spin-frustration in honeycomb-layered tellurates with Ag bilayers

“…A honeycomb layered tellurate A 2 M 2 TeO 6 , where A is typically an alkali metal (e.g., A = Li, Na, K) and M is typically a 3d transition metal (e.g., M = Ni, Co), has a 2D honeycomb lattice that can potentially host the Kitaev spin liquid state. So far, antiferromagnetic (AFM) transition with the Ne ´el temperature (T N ) below 35 K has been reported for Na 2 Co 2 TeO 6 , [15][16][17][18][19][20] 26 in which (Te, Co)-O and (Te, Ni)-O honeycomb layers are responsible for the AFM ordering. However, there have been limited reports on spin-frustration in the 2D magnetic honeycomb layers.…”

“…, M = Ni, Co), has a 2D honeycomb lattice that can potentially host the Kitaev spin liquid state. So far, antiferromagnetic (AFM) transition with the Néel temperature ( T N ) below 35 K has been reported for Na 2 Co 2 TeO 6 , 15–20 Na 2 Ni 2 TeO 6 , 15,19–24 K 2 Ni 2 TeO 6 , 25,26 and Li 2 Ni 2 TeO 6 , 26 in which (Te, Co)–O and (Te, Ni)–O honeycomb layers are responsible for the AFM ordering. However, there have been limited reports on spin-frustration in the 2D magnetic honeycomb layers.…”