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Ceramics

Ceramics originally came from Greek ceramicos which means a form of clay that has undergone a combustion process.
the definition of ceramics as a result of art and technology to produce burnt clay products, such as pottery, tile, porcelain and so on. But at present not all ceramics come from clay. The definition of the latest understanding of ceramics includes all non-metallic and inorganic materials in solid form. (Yusuf, 1998: 2).
Generally ceramic compounds are more stable in thermal and chemical environments than their elements. Ceramic raw materials commonly used are felspard, ball clay, quartz, kaolin and water. The nature of ceramics is largely determined by the crystal structure, chemical composition and mineral properties. Therefore the nature of ceramics also depends on the geological environment in which the material is obtained. In general, the structure is very complicated with few free electrons.
The lack of some ceramic-free electrons makes most of the ceramic material electrically not a conductor and also a bad conductor of heat. In addition, ceramics have brittle, hard and rigid properties. Ceramics in general have better compressive strength than their tensile strength.