Evidence of maximum in the melting curve of hydrogen at megabar pressures |
| |
Authors: | M I Eremets and I A Trojan |
| |
Institution: | (1) Max Planck Institute für Chemie, 55020 Mainz, Germany;(2) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, 117333, Russia |
| |
Abstract: | Hydrogen at high pressures of ∼400 GPa might be in a zero-temperature liquid ground state (N. Ashcroft, J. Phys.: Condens. Matter A 12, 129 (2000), E. G. Brovrnan et al., Sov. Phys. JETP 35, 783 (1972)). If metallic hydrogen is liquid, the melting T
melt(P) line should possess a maximum. Here we report on the experimental evaluation of the melting curve of hydrogen in the megabar
pressure range. The melting curve of hydrogen has been shown to reach a maximum with T
melt = 1050 ± 60 K at P = 106 GPa and the melting temperature of hydrogen decreases at higher pressures so that T
melt = 880 ± 50 K at P = 146 GPa. The data were acquired with the aid of a laser heating technique where diamond anvils were not deteriorated by
the hot hydrogen. Our experimental observations are in agreement with the theoretical prediction of unusual behavior of the
melted hydrogen S. Bonev et al., Nature 481, 669 (2004)].
The article is published in the original. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|