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We report on the magnetic, thermodynamic, dielectric, and pyroelectricmeasurements on the hitherto unreported Fe${_4}$Ta${_2}$O${_9}$. This system isseen to exhibit a series of magnetic transitions, many of which are coupled tothe emergence of ferroelectric order, making Fe${_4}$Ta${_2}$O${_9}$ the onlygenuine multiferroic in its material class. We suggest that the observedproperties arise as a consequence of an effective reduction in thedimensionality of the magnetic lattice, with the magnetically activeFe${^{2+}}$ ions preferentially occupying a quasi 2D buckled honeycombstructure. The low temperature $H$-$T$ phase diagram of Fe${_4}$Ta${_2}$O${_9}$reveals a rich variety of coupled magnetic and ferroelectric phases, insimilarity with that observed in the distorted Kagome systems.

Coupled magnetic and ferroelectric states in the distorted honeycomb system Fe$_{4}$Ta$_{2}$O$_{9}$