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The magnetic properties of NiTa$_2$O$_6$ were investigated by magneticsusceptibility, specific heat, electron paramagnetic resonance, neutron powderdiffraction and pulse field magnetization measurements. Accompanying \textit{abinitio} DFT calculations of the spin-exchange constants complemented andsupported our experimental findings that NiTa$_2$O$_6$ must be described as aquasi-1D Heisenberg $S$ = 1 spin chain system with a nearest-neighbor onlyanti-ferromagnetic spin-exchange interaction of 18.92(2) K. Inter-chaincoupling is by about two orders of magnitude smaller. Electron paramagneticresonance measurements on Mg$_{1-x}$Ni$_x$Ta$_2$O$_6$ ($x \approx$ $1\%$)polycrystalline samples enabled us to estimate the single-ion zero-fieldsplitting of the $S$ = 1 states which amounts to less than $4\%$ of thenearest-neighbor spin-exchange interaction. At 0 T NiTa$_2$O$_6$ undergoeslong-range anti-ferromagnetic ordering at 10.3(1) K evidenced by a$\lambda$-type anomaly in the specific heat capacity. On application of amagnetic field the specific heat anomaly is smeared out. We confirmed themagnetic structure by neutron powder diffraction measurements and at 2.00(1) Krefined a magnetic moment of 1.93(5) $\mu_{\rm{B}}$ per Ni$^{2+}$ ion.Additionally, we followed the magnetic order parameter as a function oftemperature. Lastly we found saturation of the magnetic moment at 55.5(5) Twith a $g$-factor of 2.14(1), with an additional high field phase above 12.8(1)T. The onset of the new high field phase is not greatly effected bytemperature, but rather smears out as one approaches the long-range orderingtemperature.

Investigation of the strongly correlated one-dimensional magnetic behavior of NiTa2O6