Melting of iron determined by X-ray absorption spectroscopy to 100 GPa

被引：68

作者：

Aquilanti, Giuliana ^{[1
]}

Trapananti, Angela ^{[2
]}

Karandikar, Amol ^{[3
,4
]}

Kantor, Innokenty ^{[5
]}

Marini, Carlo ^{[5
]}

Mathon, Olivier ^{[5
]}

Pascarelli, Sakura ^{[5
]}

Boehler, Reinhard ^{[3
]}

机构：

[1] Elettra Sincrotrone Trieste, I-34149 Trieste, Italy

[2] CNR, Ist Officina Mat, OGG, F-38043 Grenoble 9, France

[3] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA

[4] Goethe Univ, Geowissensch, D-60438 Frankfurt, Germany

[5] European Synchrotron Radiat Facil, F-38043 Grenoble 9, France

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2015年 / 112卷 / 39期

基金：

美国国家科学基金会;

关键词：

iron melting curve; XAS; megabar range; EARTHS CORE; DIFFRACTION; PRESSURES; BOUNDARY; FE;

D O I：

10.1073/pnas.1502363112

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Temperature, thermal history, and dynamics of Earth rely critically on the knowledge of the melting temperature of iron at the pressure conditions of the inner core boundary (ICB) where the geotherm crosses the melting curve. The literature on this subject is overwhelming, and no consensus has been reached, with a very large disagreement of the order of 2,000 K for the ICB temperature. Here we report new data on the melting temperature of iron in a laser-heated diamond anvil cell to 103 GPa obtained by X-ray absorption spectroscopy, a technique rarely used at such conditions. The modifications of the onset of the absorption spectra are used as a reliable melting criterion regardless of the solid phase from which the solid to liquid transition takes place. Our results show a melting temperature of iron in agreement with most previous studies up to 100 GPa, namely of 3,090 K at 103 GPa.

引用

页码：12042 / 12045

页数：4

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