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MnTiO3 has been studied for many decades, but it was only in the last fewyears that its strong magnetoelectric behavior had been observed. Here, we useneutron scattering on two separately grown single crystals and two powdersamples to show the presence of a supercell that breaks R-3 symmetry. We alsopresent the temperature and field dependence of the dielectric constant andpyroelectric current, and show evidence of non-zero off-diagonalmagnetoelectric tensor elements (forbidden by R-3 symmetry) followed by apolarization flop accompanying the spin flop transition at {\mu}0HSF = 6.5 T.M\"ossbauer spectroscopy on MnTiO3 gently doped with 57Fe was used to help shedlight on the impact of the supercell on the observed behavior. Although thefull supercell structure could not be solved at this time due to a lack ofvisible reflections, the full-scope of the results presented here suggest thatthe role of local spin-lattice coupling in the magnetoelectric properties ofMnTiO3 is likely more important than previously thought.

Incommensurate crystal supercell and polarization-flop observed in the magnetoelectric ilmenite, MnTiO3