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In situ high pressure (0-1 GPa) M\"ossbauer spectroscopy has been used to demonstrate for the first time the enhanced compressibility κ of the intercrystalline (IC) regions of nanocrystalline iron compared with that of bulk crystalline α-iron (κIC≈6.6κFe). The component of the M\"ossbauer spectra due to IC regions exhibits a pressure-induced reversible change of the center shift that is about an order of magnitude larger than that of crystalline bulk α-iron. The effect saturates at pressures above 600 MPa. This change of center shift was removed on pressure annealing the samples, indicating transformation of the interfacial region to a more dense, less compressible structure.
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Trapp et al. (1995) studied this question.
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