A Caltech Library Service

Shock-induced superheating and melting curves of geophysically important minerals

Luo, Sheng-Nian and Ahrens, Thomas J. (2004) Shock-induced superheating and melting curves of geophysically important minerals. Physics of the Earth and Planetary Interiors, 143-144 . pp. 369-386. ISSN 0031-9201. doi:10.1016/j.pepi.2003.04.001.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


Shock-state temperature and sound-speed measurements on crystalline materials, demonstrate superheating-melting behavior distinct from equilibrium melting. Shocked solid can be superheated to the maximum temperature, T_c′. At slightly higher pressure, P_c, shock melting occurs, and induces a lower shock temperature, T_c. The Hugoniot state, (P_c,T_c), is inferred to lie along the equilibrium melting curve. The amount of superheating achieved on Hugoniot is, Θ_H+=T_c′/T_c−1. Shock-induced superheating for a number of silicates, alkali halides and metals agrees closely with the predictions of a systematic framework describing superheating at various heating rates [Appl. Phys. Lett. 82 (12) (2003) 1836]. High-pressure melting curves are constructed by integration from (P_c,T_c) based on the Lindemann law. We calculate the volume and entropy changes upon melting at (P_c,T_c) assuming the R ln 2 rule (R is the gas constant) for the disordering entropy of melting [J. Chem. Phys. 19 (1951) 93; Sov. Phys. Usp. 117 (1975) 625; Poirier, J.P., 1991. Introduction to the Physics of the Earth’s Interior. Cambridge University Press, Cambridge, 102 pp.]. (P_c,T_c) and the Lindemann melting curves are in excellent accord with diamond-anvil cell (DAC) results for NaCl, KBr and stishovite. But significant discrepancies exist for transition metals. If we extrapolate the DAC melting data [Phys. Rev. B 63 (2001) 132104] for transition metals (Fe, V, Mo, W and Ta) to 200–400 GPa where shock melting occurs, shock temperature measurement and calculation would indicate Θ_H+∼0.7–2.0. These large values of superheating are not consistent with the superheating systematics. The discrepancies could be reconciled by possible solid–solid phase transitions at high pressures. In particular, this work suggests that Fe undergoes a possible solid–solid phase transition at ∼200 GPa and melts at ∼270 GPa upon shock wave loading, and the melting temperature is ∼6300 K at 330 GPa.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
Additional Information:© 2004 Elsevier B.V. Received 5 February 2003; received in revised form 22 April 2003; accepted 23 April 2003. This work has been supported by NSF Grant No. EAR-0207934. We have benefited from the discussion with R. Boehler. Constructive comments by T. Duffy and two reviewers helped to improve the manuscript. Contribution No. 8927, Division of Geological and Planetary Sciences, California Institute of Technology.
Funding AgencyGrant Number
Subject Keywords:Superheating; Melting curve; Shock waves; Sound-speed; Molecular dynamics
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences8927
Record Number:CaltechAUTHORS:20141022-125925807
Persistent URL:
Official Citation:Sheng-Nian Luo, Thomas J. Ahrens, Shock-induced superheating and melting curves of geophysically important minerals, Physics of the Earth and Planetary Interiors, Volumes 143–144, 15 June 2004, Pages 369-386, ISSN 0031-9201, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50685
Deposited By: Tony Diaz
Deposited On:22 Oct 2014 21:50
Last Modified:10 Nov 2021 18:59

Repository Staff Only: item control page