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Preferred Label : diamond;

IUPAC definition : An allotropic form of the element carbon with cubic structure (space group O h 7- F d 3 m) which is thermodynamically stable at pressures above 6 GPa at room temperature and metastable at atmospheric pressure. At low pressures diamond converts rapidly to graphite at temperatures above 1900 K in an inert atmosphere. The chemical bonding between the carbon atoms is covalent with sp3 hybridization.;

Scope note : there is also a hexagonal diamond-like structure of the element carbon (lonsdaleite).;

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An allotropic form of the element carbon with cubic structure (space group O h 7- F d 3 m) which is thermodynamically stable at pressures above 6 GPa at room temperature and metastable at atmospheric pressure. At low pressures diamond converts rapidly to graphite at temperatures above 1900 K in an inert atmosphere. The chemical bonding between the carbon atoms is covalent with sp3 hybridization.

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29/07/2025


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