A MODEL FOR DISORDER IN FLUORINE-INTERCALATED GRAPHITE

被引：30

作者：

DIVITTORIO, SL

DRESSELHAUS, MS

DRESSELHAUS, G

机构：

[1] MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139

[2] MIT,FRANCIS BITTER NATL MAGNET LAB,CAMBRIDGE,MA 02139

[3] MIT,DEPT PHYS,CAMBRIDGE,MA 02139

来源：

JOURNAL OF MATERIALS RESEARCH | 1993年 / 8卷 / 07期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1557/JMR.1993.1578

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The structural and electronic properties of fluorine- and bromine-intercalated graphite fibers and HOPG are summarized. In contrast to the bromine intercalate, which is purely ionic for any experimentally attainable intercalate concentration, fluorine has a dual ionic and covalent behavior in graphite. Furthermore, whereas bromine-intercalated graphite is ordered, fluorine-intercalated graphite is disordered. The stiff graphene planes are buckled and islands of various fluorine concentrations are formed. A thermodynamic model is proposed that accounts for the differences between fluorine- and bromine-intercalated graphite materials. The model describes the competition between ionically bonded and covalently bonded intercalate phases of fluorine in graphite. Covalent bonding is more favorable energetically, but an important nucleation barrier exists due to strain and to the destruction of the conjugation of the double bonds.

引用

页码：1578 / 1585

页数：8

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