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CHE 333 Class 23. Ceramics

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CHE 333 Class 23. Ceramics. Ceramic Structures. MIXTURES OF ELEMENTS Two Criteria for ceramic structures Electrical Neutrality using ionic charge cation (positive charge) must equal anion (negative charge) amounts. Eg NaCl Na one positive, Cl one negative - PowerPoint PPT Presentation

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Page 1: CHE 333 Class 23

CHE 333 Class 23.

Ceramics

Page 2: CHE 333 Class 23

Ceramic StructuresMIXTURES OF ELEMENTSTwo Criteria for ceramic structures

1. Electrical Neutrality using ionic chargecation (positive charge) must equal anion(negative charge) amounts.Eg NaCl Na one positive, Cl one negative

2. Cations (+ve) – usually smaller, contact Anions (-ve) in structure. Determines the coordination number of the structure forceramics. Within certain ranges onlyparticular coordination numbers willaccommodate the different sized ionscontacting each other.

Page 3: CHE 333 Class 23

AX Ionic Structures

NaCl structure CN 6 CsCl structure CN 8 ZnS structure CN 4

All these have a 1 to 1 cation to anion ratio, but different coordination numbers.

Page 4: CHE 333 Class 23

AnXm and AnBmXp Structure

Calcium Flouride CaF2 Barium Titanate Piezoelectric material

Page 5: CHE 333 Class 23

Ceramic Structures

Page 6: CHE 333 Class 23

Glass Silica Tetrehedra

Tetrahedral Structure SiO44-

Si – O ionic ratio is 0.29 tetra CN

Unit cell of silicates. High Crystobalite 1470 to 1710C


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