Microscopic evidence of a flat melting curve of tantalum

New data on the high-pressure melting curve of Ta up to 48 GPa are reported. Evidence of melting from changes in sample texture was found in five different experiments using scanning electron microscopy. The obtained melting temperatures are in excellent agreement with earlier measurements using X-r...

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Bibliographic Details
Published in:Physics of the earth and planetary interiors 2010-07, Vol.181 (1), p.69-72
Main Authors: Ruiz-Fuertes, Javier, Karandikar, Amol, Boehler, Reinhard, Errandonea, Daniel
Format: Article
Language:English
Subjects:
Diamond-anvil cell
High pressure
Laser-heating
Melting curve
Transition metals
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Summary:New data on the high-pressure melting curve of Ta up to 48 GPa are reported. Evidence of melting from changes in sample texture was found in five different experiments using scanning electron microscopy. The obtained melting temperatures are in excellent agreement with earlier measurements using X-ray diffraction or the laser-speckled method but are in contrast with several theoretical calculations. The results are also compared with shock-wave data. These findings are of geophysical relevance because they confirm the validity of earlier experimental techniques that resulted in low melting slopes of the transition metals measured in the diamond-anvil cell, including iron.
ISSN:0031-9201
1872-7395
0031-9201
DOI:10.1016/j.pepi.2010.03.013