High-pressure differential thermal analysis measurements of the melting curve of lithium

被引:39
|
作者
Lazicki, Amy [1 ]
Fei, Yingwei [1 ]
Hemley, Russell J. [1 ]
机构
[1] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA
基金
美国国家科学基金会;
关键词
Lithium; Melting; High pressure; Differential thermal analysis; SIMPLE METALS; SODIUM; POTASSIUM; MANTLE; GPA;
D O I
10.1016/j.ssc.2009.12.029
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The pressure effect on the melting behavior of lithium has been measured by observing the latent heat signatures of melting and freezing using differential thermal analysis (DTA). Samples were repeatedly melted and recrystallized at selected pressures up to 15 GPa in a multianvil press. Despite the weak DTA signals due to small sample sizes at high pressure, the melting and freezing temperatures were clearly determined from the derivatives of the DTA traces. We measured a drop in the melting temperature between 9 and 12 GPa, yielding a maximum at 10(2) GPa and 245(2) degrees C. This work highlights both the successes and failures of recent theoretical models for the melting behavior of this and related systems. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:625 / 627
页数:3
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