does the APF depend on the temperature


by Dell
Tags: depend, temperature
Dell
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#1
Dec25-09, 02:33 AM
P: 590
does the APF depend on the temperature
a) yes
b) no
c) only for metals
d) only for ceramics

i know that for iron for example the bravias lattice can change at different temperatures, but does the atomic packing factor also, i would think yes, but is this true for all materials or just metals?
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Mapes
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#2
Dec26-09, 09:12 AM
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How is the APF defined? What characteristics of a material does it incorporate? Could these characteristics change slowly (or hint: suddenly) with temperature?
Dell
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#3
Dec26-09, 11:54 AM
P: 590
i would think so, if it is the volume of the atoms/ volume of the cube, and the lattice changes i would think that the APF would too, but i know this can happen in metals, but is it true for all materials or only metals

Mapes
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#4
Dec27-09, 09:52 AM
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does the APF depend on the temperature


I don't believe the APF depends on the lattice constant, but I agree that it will change with crystal structure. And yes, crystal structure changes are possible with nonmetals also (e.g., diamond/graphite).
Kushal
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#5
Dec27-09, 05:36 PM
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how about expansion and contraction due to temperature changes?!
Mapes
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#6
Dec27-09, 10:20 PM
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Well, what's the APF for a hexagonal close-packed structure, for example? Does it depend on temperature, as long as the crystal arrangement is unchanged?


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