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X-ray diffraction measurements of Mo melting to 119 GPa and the high pressure phase diagram

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X-ray diffraction measurements of Mo melting to 119 GPa and the high pressure phase diagram

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dc.contributor.author	Santamaría-Pérez, David
dc.contributor.author	Ross, M.
dc.contributor.author	Errandonea Ponce, Daniel
dc.contributor.author	Mukherjee, G. D.
dc.contributor.author	Mezouar, M.
dc.contributor.author	Boehler, R.
dc.date.accessioned	2010-05-21T10:59:48Z
dc.date.available	2010-05-21T10:59:48Z
dc.date.issued	2009
dc.identifier.citation	SANTAMARÍA PÉREZ, D. ; ROSS, M. ; ERRANDONEA, D. ; MUKHERJEE, G.D. ; MEZOUAR, M. ; BOEHLER, R. X-ray diffraction measurements of Mo melting to 119 GPa and the high pressure phase diagram. En: Journal of Chemical Physics, 2009, vol. 130	en
dc.identifier.uri	http://hdl.handle.net/10550/4358
dc.description.abstract	In this paper, we report angle-dispersive X-ray diffraction data of molybdenum melting, measured in a double-sided laser-heated diamond-anvil cell up to a pressure of 119 GPa and temperatures up to 3400 K. The new melting temperatures are in excellent agreement with earlier measurements up to 90 GPa that relied on optical observations of melting and in strong contrast to most theoretical estimates. The X-ray measurements show that the solid melts from the bcc structure throughout the reported pressure range and provide no evidence for a high temperature transition from bcc to a close-packed structure, or to any other crystalline structure. This observation contradicts earlier interpretations of shock data arguing for such a transition. Instead, the values for the Poisson ratios of shock compressed Mo, obtained from the sound speed measurements, and the present X-ray evidence of loss of long-range order suggest that the 210 GPa ( ∼ 4100 K) transition in the shock experiment is from the bcc structure to a new, highly viscous, structured melt.	en_US
dc.language.iso	en	en
dc.subject	Acoustic wave velocity ; High-pressure effects ; Melting ; Molybdenum ; Phase diagrams ; Shock wave effects ; X-ray diffraction	en
dc.title	X-ray diffraction measurements of Mo melting to 119 GPa and the high pressure phase diagram	en
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::FÍSICA::Química física	en
dc.identifier.doi	10.1063/1.3082030	en
dc.type.hasVersion	VoR	es_ES
dc.identifier.url	http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=JCPSA6000130000012124509000001&idtype=cvips&prog=normal&doi=10.1063/1.3082030	en