MGB2C2, A NEW GRAPHITE-RELATED REFRACTORY COMPOUND

被引：58

作者：

WORLE, M ^{[1
]}

NESPER, R ^{[1
]}

机构：

[1] ETH ZURICH,INORGAN CHEM LAB,CH-8092 ZURICH,SWITZERLAND

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1994年 / 216卷 / 01期

关键词：

BOROCARBIDES; ALKALINE EARTH METALS; GRAPHITE; IONIC CONDUCTIVITY;

D O I：

10.1016/0925-8388(94)91045-6

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

MgB2C2 is the first structurally well-characterized borocarbide of the alkaline earth metals. The orthorhombic crystal structure (a = 1092.2 pm, b = 946.1 pm, c = 745.9 pm, Cmca-D-2h(18)) contains slightly puckered graphite-related layers (2)(infinity)[BC](-). The puckering is caused by a specific Mg2+ distribution. Only one half of the possible cation sites are occupied, which gives rise to an enhanced ionic conductivity. The compound undergoes topochemical reactions. MgB2C2 is a brittle material which crystallizes with thin red transparent platelets.

引用

页码：75 / 83

页数：9

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