Short Note on Graphite
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| Graphite (Source: Wikipedia) |
- Reactive form of Carbon.
- Dark,opaque and light material.
- Though non-metallic,graphite posses metallic lustre
- Density =2.22 g cm^-3.
- Graphite is composed of flat two-dimensional sheets of carbon
- Each sheet is a hexagonal net of C-atoms,and may regard as a fused system of benzene rings.
- Layers held together by relatively weak Wan Der Waals forces
- In graphite,C atom is sp2 hybridised and non bonded pz orbitals overlap to give completely delocalized system of molecular orbits.Due to excitation of these electrons,graphite appears black.
- Good conductor of heat and electricity because of the presence of free electrons on each carbon atom.
- It cleaves easily between the layers,which account for the remarkable softness of the crystals.
- Thermodynamically more stable than diamond.
- Used as a lubricant.
- It is used for making electrodes in steel making and metal foundries,for crucibles,in pencils and break linings
- Used as a moderator in the cores of gas cooled nuclear reactors,where it slows down neutrons.
- Present as diamagnetic,but intercalation compunds are paramagnetic.
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| Layers of Graphite(Source:Wikipedia) |
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