Ceramic Solid Solution coupled substitution

presidentstandishUrban and Civil

Nov 15, 2013 (3 years and 9 months ago)

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Ceramic Solid Solution



coupled substitution


-

Every oxide compound can be broken up into a simple oxide compound,
1:1:6


Substitution of
Ca

in structure
:






i.e.







Imperfections/Defects
:


A.

If crystals were perfect


A捴cality

-

Strengths of 1,000,000 psi


Strengths les than 1,000,000 psi

-

No diffusion


Alloys; Solutions (lots of diffusion)

-

No plasticity


Easily deformed

-

Perfect electrical conductivity


Not perfect, except for s
uperconductors, because of








grain boundaries


B. Imperfections


classified by dimensions


Zero



point defects


One



line defects


Two



surface defects


Three



volume defects

Cations in
8 fold sites

4 fold
sites

Corners and f
aces
in FCC array