Methods of increasing the measurement accuracy during the experimental determination of the melting point of graphite

被引：28

作者：

Basharin, AY ^{[1
]}

Brykin, MV ^{[1
]}

Marin, MY ^{[1
]}

Pakhomov, IS ^{[1
]}

Sitnikov, SF ^{[1
]}

机构：

[1] Russian Acad Sci, Sci Associat, Inst High Temp, IVTAN,Inst High Energy Dens, Moscow 125412, Russia

来源：

HIGH TEMPERATURE | 2004年 / 42卷 / 01期

关键词：

D O I：

10.1023/B:HITE.0000020092.25360.33

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The experimental procedure involving pulsed laser heating is realized, which enables one to investigate phase transformations in graphite and eliminates the homogeneous condensation of carbon vapor over a sample. Data are obtained on the melting point of graphite and the temperature of crystallization of liquid carbon at a pressure of 15 MPa, The absence of a difference between the melting point of graphite at a heating rate of 100 M K/s and the temperature of crystallization of liquid carbon at the cooling rate of the melt bath of 1.6 MK/s is revealed, which is indicative of the quasi-equilibrium of the melting process. In view of this, the temperature data are averaged by a unified value of 4800 100 K. It is shown that, during the crystallization of carbon melt, highly ordered graphite with crystallites up to 250 mum in size is formed in a liquid film 5 mum thick on a graphite substrate.

引用

页码：60 / 67

页数：8

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