Types of Materials Types of Materials Metals: valence electrons are free moving, and spread in an 'electron sea' that "glues" the ions together. Strong, ductile, conduct electricity and heat well, are shiny if polished. Semiconductors: the bonding is covalent. Their electrical properties depend strongly on minute proportions of contaminants. Examples: Si, Ge, GaAs. Ceramics: composed of ions, and are bound by Coulomb forces. They are usually combinations of metals or semiconductors with oxygen, nitrogen or carbon, Hard, brittle, insulators. Examples: glass, porcelain. Polymers: are bound are covalent bonded or weak van der Waals bonded, based on C and H. They decompose at moderate temperatures (100 – 400 o C), and are lightweight. Examples: plastics rubber.
Types of Materials
Jun 24, 2023
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