Intermediate Topic 200 of 1102 Bonding & Molecular Structure
Diamond Structure
Each carbon is sp3 bonded to four others in a rigid tetrahedral network.
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In-depth explanation of Diamond Structure
Diamond is a covalent network solid in which each carbon atom is bonded tetrahedrally to four others, forming a continuous three-dimensional network. Each carbon is sp3 hybridized and every C-C bond is about 154 pm long. The rigidity of this network makes diamond the hardest naturally occurring substance, and it has very high thermal conductivity because lattice vibrations carry heat efficiently. Because all valence electrons are localized in bonds, diamond has a large band gap and is an electrical insulator. Its structure is a face-centred cubic lattice with a two-atom basis.
Going deeper: Diamond Structure
Key ideas: Facts: cubic unit cell with 8 atoms, edge length 357 pm, bond length 154 pm, density 3.51 g/cm3, band gap about 5.5 eV, thermal conductivity higher than copper. Mohs 10, but diamond is brittle and cleaves along planes, and it burns in oxygen at about 700 to 900 C. Synthetic diamonds are made by high-pressure high-temperature methods or chemical vapour deposition.
Common mistakes and connections: Students think hardest means unbreakable: diamond cleaves and shatters under a sharp blow. Another is saying it is conductive because it is carbon. It is a good thermal conductor but an electrical insulator. Doping with boron makes it a semiconductor. Links to sp3 hybridization, network solids and band theory.
Visualization of Diamond Structure
Every carbon is bonded tetrahedrally to four others by 154 pm sigma bonds in a rigid 3D network, making diamond extremely hard and a poor conductor. The interactive lesson shows this as a live animation or chart.
Worked example and use case
Diamond's extreme hardness makes it useful in cutting and grinding tools for hard materials.
Frequently asked questions about Diamond Structure
What is Diamond Structure?
Each carbon is sp3 bonded to four others in a rigid tetrahedral network.
Is Diamond Structure a beginner, intermediate or advanced topic?
Diamond Structure is a intermediate topic in Bonding & Molecular Structure. It builds on the vocabulary of beginner topics in this area.
What should I learn before Diamond Structure?
Study these earlier topics in Bonding & Molecular Structure first: Metallic Solids, Allotropes of Carbon, Graphite Structure.
What comes after Diamond Structure?
The next topics in Bonding & Molecular Structure are Graphene and Fullerenes.
Can I practise Diamond Structure with quizzes?
Yes. The interactive lesson includes a self-check question on Diamond Structure, and the Bonding & Molecular Structure quiz draws on every topic in this area.
Where Diamond Structure fits in Bonding & Molecular Structure
Diamond Structure is topic 85 of 104 in Bonding & Molecular Structure.