that graphite is a mixed crystal.
Views£º £¬ Time£º2016/11/7 21:58:59
In the graphite crystal, the same layer of carbon atoms in the SP2 hybrid to form a covalent bond, each carbon atom with three covalent bonds with the other three atoms. Six carbon atoms are six ring shaped again and again on the same plane, extending into lamellar structure, here the C-C bond length is 142pm, which is attributed to the long scale atomic crystal button, and on the same layer, it is atomic crystal. Carbon atoms in the same plane are also left with a p track that stacks with each other. Electrons are free, equal to the free electrons in the metal, so the graphite can conduct heat and electricity, which is the characteristic of the metal. So it is also classified as a metal crystal.
The graphite crystals are separated by 340pm between the middle layer and the layer, and the distance is larger, which is connected with the Fan Dehua force, that is, the molecular crystal is attributed to the layer and layer. However, because the carbon atoms on the same plane layer is very strong, very difficult to destroy, so the melting point of graphite is also very high, chemical properties are stable.
In view of its special bonding method, can not be a single thought that is the atomic crystal or molecular crystal, according to the modern way of expression, that graphite is a mixed crystal.
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