Creating Reactivity with Unstable Endmembers using Pressure and Temperature: Synthesis of Bulk Cubic Mg0.4Fe0.6N |
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| Authors: | Dr. George Serghiou Dr. Gang Ji Dr. Nicholas Odling Dr. Hans J. Reichmann Prof. Jean‐Paul Morniroli Dr. Reinhard Boehler Prof. Dan J. Frost Dr. Jonathan P. Wright Dr. Bernd Wunder |
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| Affiliation: | 1. School of Engineering, University of Edinburgh, Kings Buildings, Mayfield Road, EH9 3FB, Edinburgh (UK) http://www.homepages.ed.ac.uk/gserghio/;2. Unité Matériaux et Transformations, UMR CNRS 8207, Université Lille 1, Villeneuve d'Ascq, 59655 Lille (France);3. School of Geosciences, The Grant Institute, University of Edinburgh, Kings Buildings, West Mains Road, EH9 3JW, Edinburgh (UK);4. Helmholtz‐Zentrum Potsdam, German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam (Germany);5. Université Lille 1 and Ecole Nationale Supérieure de Chimie de Lille, Villeneuve d'Ascq, 59655 Lille (France);6. Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, 20015 (USA);7. Bayerisches Geoinstitut, Universit?t Bayreuth, 95540, Bayreuth (Germany);8. European Synchrotron Radiation Facility, 38043 Grenoble (France) |
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| Abstract: | Alloy and nitride solid solutions are prominent for structural, energy and information processing applications. There are frequently however barriers to making them. We remove barriers to reactivity here using pressure with a new synthetic approach. We target pressures where the reasons for cubic endmember nitride instability can become the driving force for cubic nitride solid solution stability. Using this approach we form a novel rocksalt Mg0.4Fe0.6N solid solution at between 15 and 23 GPa and up to 2500 K. This is a system where, neither an alloy nor a nitride solid solution form at ambient conditions and bulk MgN and FeN endmembers do not form, either at ambient or at high pressure. The new nitride is formed, by removing endmember lattice mismatch with pressure, allowing a stabilizing redistribution of valence electrons upon heating. This approach can be employed for a range of normally unreactive systems. Mg, Fe and enhanced nitrogen presence, may also indicate a richer reaction chemistry in our planets interior. |
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| Keywords: | angle‐dispersive X‐ray diffraction nitrides precession electron diffraction pressure and temperature reactivity |
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