Crystalline Solids. p. 459 Macroscopic structure depends upon microscopic structure.

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Presentation transcript:

Crystalline Solids

p. 459

Macroscopic structure depends upon microscopic structure.

Fluorite (CaF 2 )Amethyst (SiO 2 ) – quartz + Fe & Mn Pyrite (FeS 2, fool’s gold)

Crystal terms Crystal – Lattice – Unit cell – Edge length (d o ) – corner edge face

Atoms and ions are represented by spheres. The spheres stack in different patterns three- dimensionally. The close packing of spheres maximizes intermolecular force. The patterns of stacking result in different types of unit cells and lattices. Packing in Crystals

Lattice – unit cell relationship

Close packing

Close packing unit cell types

Intermetallic Compounds Alloys

What about the lattice space left over?

NaCl

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