Аннотация: Effect of high pressure induced spin crossover on the magnetic, electronic and structural properties of the minerals forming the Earth's low mantle is discussed. The low temperature P, T phase diagram of ferropericlase has the quantum phase transition point P = 56 GPa at T = 0 confirmed recently by the synchrotron Mossbauer spectroscopy. The LDA+GTB calculated phase diagram describes the experimental data. Its extension to the high temperature resulted earlier in prediction of the metallic properties of the Earth's mantle at the depth 1400 km h 1800 km. Estimation of the electrical conductivity based on the percolation theory is given. We discuss also the thermodynamic properties and structural anomalies resulting from the spin crossover and metal insulator transition and compare them with the experimental seismic and geomagnetic field data.
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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Akademgorodok 50 Bldg 38, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Sukhachev Inst Forest, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Trofimuk Inst Petr Gas Geol & Geophys, Novosibirsk 630090, Russia.
Доп.точки доступа:
Ovchinnikov, S. G.; Ovchinnikova, T. M.; Plotkin, V. V.; Dyad'kov, P. G.