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Crystal structure

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joe0515:
1.Calculate the theoretical volume change accompanying a polymorphic tranformation in a pure metal from FCC to BCC crystal structure. Assume the hard-sphere atomic model and that there is no change in atomic volume before and after the transformation ???

3.Randomization of atomic packing in amorphous metals genarally causes no more than a 1% drop in density compared with the crystalline structure of the same composition. Calculate the APF of an amorphous, thin film of nickel whose density is 8.84g/cm^3.The normal density of nickel in crystalline state is 8.91g/cm^3

4.A common way to describe the bonding energy E curve for secondary bonding is the 6-12 potential which state that E=-ka/a^6+kr/a^12,where ka and krare constants for attraction and repulsion, respectively. This relative simple form is a quantum mechanical result for this relatively simple blood type. Calculate the bond energy and bond length for argon(ka=10.37x10^-78Jm^6 and kr=16.16x10^-135Jm612)

AWK:
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joe0515:
I already search whole day,cannot find anything :-[

AWK:
for 1
http://en.wikipedia.org/wiki/Atomic_packing_factor
For 2
http://en.wikipedia.org/wiki/Atomic_packing_factor
for 3
http://en.wikipedia.org/wiki/Lennard-Jones_potential

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