Ceramics contain metallic and nonmetallic elements that are mostly bonded ionically or covalently. As noted in Chapter 3, because their bonds lack free electrons ceramics are poor conductors of electricity and heat. Lack of free electrons makes them also transparent to light. The ionic bonds are highly directional and stable; therefore they have relatively higher melting temperatures, on the average, than metals or polymers. Generally they are also harder and more resistant to chemical changes. Other factors influencing the structure and property relationship of the ceramic materials are radius ratio (Section 3.2) and relative electronegativity between the positive and negative ions, although the net electrical charge of any material should be zero.
KeywordsCompressive Strength Ceramic Material Barium Titanate Piezoelectric Ceramic High Melting Temperature
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