Mössbauer study on shocked hematite

Mössbauer spectra of polycrystalline hematite shocked at pressures up to 40 GPa are studied in the temperature range between 100 and 300 K. The initial temperatures T0 of the samples before applying pressures are 80 and 300 K. The Morin transition is broadened over a range of 70 K and occurs only for one half of the total number of iron atoms at both the T0. Debye temperatures T DM are estimated according to the Mössbauer data to be 360 K for raw hematite and 270 or 140 K for shocked one at T0 = 80 and 300 K, respectively. The results are discussed in terms of the formation of point defects located mainly close to the surfaces of grains. The average concentration of point defects is estimated to 1020 to 1021 cm−3. No metastable phases are observed. [Russian Text Ignored].