Structure Of Ceramics Ppt

Fe ni al called cations and non metallic ions e g.

Structure of ceramics ppt. Factors that determine crystal structure. 3 1 fireclay 3 2 silica 3 3 basic refractories 3 4 special refractories 4 abrasives 5 cements 6. O n cl called anions bonding will usually have some covalent character but is. Ceramic crystal structure broader range on chemical composition than metals with more complicated structures contains at least 2 and often 3 or more atoms usually compounds between metallic ions e g.

In a single crystal the atoms. Close packed oxygen in a lattice usually fcc cations fit into interstitial sites among oxygen ions. 1 relative sizes of ions formation of stable structures. Structure of ceramics all structures consist of one of the 14 well known bravais lattices plus a collection of atoms the basis that decorates each lattice point.

Oxygen anions larger than metal cations. Structure of metals ceramics ppt. A polycrystalline structure through heat treatment proportion of crystalline phase range 90 to 98 remainder being unconverted vitreous material grain size usually between 0 1 1 0 m 4 and 40 in significantly smaller than the grain size of conventional ceramics this fine crystal structure makes glass ceramics. The arrangement of ions and atoms affect the thermal electrical dielectric optical and magnetic properties of ceramics.

Academia edu is a platform for academics to share research papers. Outline of topic 3. Chapter 3 structures of metals ceramics the properties of a material depends on the arrangement of atoms within the solid. Amorphous structure means that atoms are not organized according to a well ordered repeating arrangement as in crystals.

Advanced structural ceramics advanced structural ceramics prospects of toughened ceramics. Properties of ceramics classification of ceramics ceramic raw material fabricating and processing of ceramic application of ceramics 1 glasses 2 clay products 2 1 structural clay product 2 2 whitewares 3 refractories. 2 ceramic structures continue factors influence crystal structure magnitude of electrical charge of ions relative size of ions non metal metal ions rc ra 1 äcations must be next to anions maximize of nearest neighbors that are anions ästable structure anions and cations must contact each other äthe of anions depends on ratio of rc ra. Glass ceramics are made of small grains surrounded by a glassy phase and have properties in between those of glass and ceramics.