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Quasicrystals at extreme conditions: The role of pressure in stabilizing icosahedral Al63Cu24Fe13 at high temperature

Author(s): Stagno, Vincenzo; Bindi, Luca; Park, Changyong; Tkachev, Sergey; Prakapenka, Vitali B.; et al

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dc.contributor.authorStagno, Vincenzo-
dc.contributor.authorBindi, Luca-
dc.contributor.authorPark, Changyong-
dc.contributor.authorTkachev, Sergey-
dc.contributor.authorPrakapenka, Vitali B.-
dc.contributor.authorMao, H-K-
dc.contributor.authorHemley, Russell J.-
dc.contributor.authorSteinhardt, Paul J.-
dc.contributor.authorFei, Yingwei-
dc.identifier.citationStagno, Vincenzo, Bindi, Luca, Park, Changyong, Tkachev, Sergey, Prakapenka, Vitali B, Mao, H-K, Hemley, Russell J, Steinhardt, Paul J, Fei, Yingwei. (Quasicrystals at extreme conditions: The role of pressure in stabilizing icosahedral A(163)Cu(24)Fe(13) at high temperature. AMERICAN MINERALOGIST, 100, 2412 - 2418. doi:10.2138/am-2015-5412en_US
dc.description.abstractIcosahedrite, the first natural quasicrystal with composition Al63Cu24Fe13, was discovered in several grains of the Khatyrka meteorite, a CV3 carbonaceous chondrite. The presence of icosahedrite associated with high-pressure phases like ahrensite and stishovite indicates formation at high pressures and temperatures due to an impact-induced shock. Previous experimental studies on the stability of synthetic icosahedral AlCuFe have either been limited to ambient pressure, for which they indicate incongruent melting at similar to 1123 K, or limited to room-temperature, for which they indicate structural stability up to about 35 GPa. These data are insufficient to experimentally constrain the formation and stability of icosahedrite under the conditions of high pressure and temperature that formed the Khatyrka meteorite. Here we present the results of room-temperature, high-pressure diamond-anvil cells measurements of the compressional behavior of synthetic icosahedrite up to 50 GPa. High P-T experiments were also carried out using both laser-heated diamond-anvil cells combined with in situ synchrotron X-ray diffraction (at 42 GPa) and multi-anvil apparatus (at 21 GPa) to investigate the structural evolution and crystallization of possible coexisting phases. The results demonstrate that the quasiperiodic order of icosahedrite is retained over the P-T range explored. We find that pressure acts to stabilize the icosahedral symmetry at temperatures much higher than previously reported. Direct solidification of AlCuFe quasicrystals from an unusual Al-Cu-rich melt is possible but it is limited to a narrow temperature range. Alternatively, quasicrystals may form after crystallization through solid-solid reactions of Al-rich phases. In either case, our results show that quasicrystals can preserve their structure even after hypervelocity impacts spanning a broad range of pressures and temperatures.en_US
dc.format.extent2412 - 2418en_US
dc.relation.ispartofAMERICAN MINERALOGISTen_US
dc.rightsAuthor's manuscripten_US
dc.titleQuasicrystals at extreme conditions: The role of pressure in stabilizing icosahedral Al63Cu24Fe13 at high temperatureen_US
dc.typeJournal Articleen_US

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