Mössbauer spectroscopy methodology at the cutting-edge of high-pressure research |
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Authors: | Moshe P Pasternak R Dean Taylor |
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Institution: | (1) School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel;(2) MST-10, Los Alamos National Laboratory, Los Alamos, NM 87545, USA |
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Abstract: | This paper provides a concise, introductory review intended mainly for Mössbauer spectroscopy (MS) scientists not familiar with the most modern aspects of High Pressure (HP) methodology. Following a short introduction to the 1st generation HP-MS based on Drickamer’s pressure cells, we describe the principles of the 2nd generation of HP-MS based on the Diamond Anvil Cell (DAC) including in-situ pressure measurements, the use of the high-specific activity 57Co(Rh) point sources, and examples of miniature DAC’s. Finally, we present recent studies carried out with 57Fe HP-MS combined with other HP techniques such as resistivity, and synchrotron-based x-ray diffraction, describing unique cases of the breakdown of magnetism and the Mott transition in hematite (Fe2O3), pressure-induced spin crossover in Wüstite (FeO), pressure induced Fe2+ → Fe3+ in Fe(OH)2, and (P,T) induced inverse? normal spinel transition in magnetite (Fe3O4). |
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Keywords: | 57Fe M?ssbauer effect high-pressure diamond-anvil cells iron-oxides Mott-transition spin-crossover |
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