Download Ceramics Ceramics are inorganic and nonmetallic materials

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Transcript
Ceramics
Ceramics are inorganic and nonmetallic materials.
Ceramic Structures
Because ceramics are composed of at least two elements, and often more, their crystal structures are
generally more complex than those for metals
Crystal Structures
For those ceramic materials for which the atomic bonding is predominantly ionic, the crystal structures
may be thought of as being composed of electrically charged ions instead of atoms.
The metallic ions, or cations, are positively charged, because they have given up their valence electrons to
the nonmetallic ions, or anions, which are negatively charged.
AX-Type Crystal Structures
Some of the common ceramic materials are those in which there are equal numbers of cations and anions.
These are often referred to as AX compounds, where A denotes the cation and X the anion.
Rock Salt Structure
Cesium Chloride Structure
Zinc Blende Structure
AmXp-Type Crystal Structures
An example would be for which a common crystal structure is found in fluorite (CaF2)
AmBnXp-Type Crystal Structures
Barium titanate (BaTiO3)
Reference: Materials Science and Engineering: an Introduction, 7th Edition, William D. Callister, Jr., John
Wiley & Sons, 2007