Pure iron has a change in crystal structure from BCC to FCC when heating up above 2. a) 912°C. If the atomic radius of an Fe atom is 0.124 nm, calculate the volumes of the FCC and BCC unit cells. b) With this information in mind, calculate the percent change in volume of a sample of pure Fe as it transforms from an FCC to a BCC structure upon cooling below 912°C. Specify if this percent change manifests as an increase or decrease in volume of the sample. Recall that there are two atoms per BCC unit cell, and four atoms per FCC unit cell.
Pure iron has a change in crystal structure from BCC to FCC when heating up above 2. a) 912°C. If the atomic radius of an Fe atom is 0.124 nm, calculate the volumes of the FCC and BCC unit cells. b) With this information in mind, calculate the percent change in volume of a sample of pure Fe as it transforms from an FCC to a BCC structure upon cooling below 912°C. Specify if this percent change manifests as an increase or decrease in volume of the sample. Recall that there are two atoms per BCC unit cell, and four atoms per FCC unit cell.
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Transcribed Image Text:Pure iron has a change in crystal structure from BCC to FCC when heating up above
2. a)
912°C. If the atomic radius of an Fe atom is 0.124 nm, calculate the volumes of the FCC and
BCC unit cells.
b)
With this information in mind, calculate the percent change in volume of a sample of pure Fe
as it transforms from an FCC to a BCC structure upon cooling below 912°C. Specify if this
Recall that there are two atoms per BCC unit cell, and four atoms per FCC unit cell.
percent change manifests as an increase or decrease in volume of the sample.
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