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High-pressure structural behavior of large-void CoSn-type intermetallics: Experiments and first-principles calculations
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
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2008 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, Vol. 77, no 1, 014102- p.Article in journal (Refereed) Published
Abstract [en]

The high-pressure structural behavior of the binary intermetallic compounds CoSn, FeSn, and NiIn with the peculiar void containing CoSn (B35)-type structure has been studied by means of room-temperature diamond anvil cell and high-temperature multianvil experiments, as well as by first-principles calculations. All three compounds remain structurally stable at pressures up to at least 25 GPa, whereas first-principles calculations predict high-pressure structural changes below 20 GPa. A plausible explanation for the discrepancy is that at room temperature, a sizable activation barrier inhibits kinetically the transformation into more close-packed polymorphs. It is supported by our experiments at temperatures around 1000 degrees C and a pressure of 10 GPa. At these conditions, NiIn transforms into the temperature-quenchable stoichiometric CsCl-type high-pressure phase, which has been predicted in our first-principles calculations. However, CoSn and FeSn decompose into a mixture of compounds richer and poorer in tin, respectively. Nevertheless, it might be possible that lower temperatures and higher pressures may afford theoretically predicted polymorphs. In particular, a phase transformation to the FeSi-type structure predicted for CoSn is of interest as materials with the FeSi-type structure are known for unusual thermal and transport properties.

Place, publisher, year, edition, pages
2008. Vol. 77, no 1, 014102- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-112442DOI: 10.1103/PhysRevB.77.014102ISI: 000252862200018OAI: oai:DiVA.org:uu-112442DiVA: diva2:286205
Available from: 2010-01-14 Created: 2010-01-13 Last updated: 2010-01-14

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