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The temperature dependent local structure of TbMn 2 O 5 was determined by x-ray absorption spectroscopy.An anomalous Tb-O distribution is found. At high temperature it is broad but resolves into two distinct peaks below ~180 K. The distributions sharpen below the Tb magnetic ordering temperature (~10 K). The distortions in the Tb-O distribution, away from the Pbam structure, are consistent with rotations of the MnO x polyhedra about the c-axis and suggest that Tb-O bond polarization may play a significant role in the observed ferroelectric properties of this system.

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