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### Topic: Crystal structure  (Read 16737 times)

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#### joe0515

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##### Crystal structure
« on: November 22, 2007, 12:52:29 PM »
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)
« Last Edit: November 22, 2007, 01:55:33 PM by joe0515 »

#### AWK

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##### Re: Crystal structure
« Reply #1 on: November 22, 2007, 01:01:21 PM »

search internet
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#### joe0515

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##### Re: Crystal structure
« Reply #2 on: November 22, 2007, 01:02:15 PM »
I already search whole day,cannot find anything

#### AWK

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##### Re: Crystal structure
« Reply #3 on: November 23, 2007, 05:32:35 AM »
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