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Дата последнего поиска статьи во внешних источниках: 9 июня 2016 г.
Аннотация: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 <em>T</em><sub>0</sub> 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 <em>T</em><sub>0</sub>. Debye temperatures are estimated according to the Mössbauer data to be 360 K for raw hematite and 270 or 140 K for shocked one at <em>T</em><sub>0</sub> = 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 10<sup>20</sup> to 10<sup>21</sup> cm<sup>−3</sup>. No metastable phases are observed.