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This article reports the structural and magnetic characterisation of a newhexagonal ($P6_3cm$) low-temperature phase of Ba$_3$Tb(BO$_3$)$_3$,isostructural with the heavier lanthanide borates with formulaBa$_3$Ln(BO$_3$)$_3$ (Ln = Dy-Lu). The crystal structure contains aquasi-two-dimensional (2D) triangular lattice of Tb$^{3+}$ ions and ispredicted to display unusual magnetic behaviour as a result of the lowdimensionality. Magnetic susceptibility $\chi(T)$ shows antiferromagneticinteractions ($\theta_{CW} = -7.15$ K) and no sharp ordering transition at $T\geq 2$ K, but analysis of $\chi'(T)$, isothermal magnetisation and heatcapacity suggests the possibility of short-range ordering at $T \approx 10$ K.The material exhibits an inverse magnetocaloric effect at $T < 4$ K.

Structure and magnetism of a new hexagonal polymorph of Ba$_3$Tb(BO$_3$)$_3$ with a quasi-2D triangular lattice