Quiz 13 potential problems ChE 350 sp10

Quiz 13 potential problems ChE 350 sp10 - and b) of Co. (a)...

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Sample question for ChE 350 Spring 2010 Quiz 12 Name:________________________ 1 1. Estimate the saturation magnetization and the saturation flux density of cobalt ferrite [(CoFe 2 O 4 ) 8 ], which has a unit cell edge length of 0.838 nm. 2. Figure 20.30 shows the B -versus- H curve for a nickel-iron alloy. (A) What is the saturation flux density? (B) What is the saturation magnetization? (C) What is the remanence? (D) What is the coercivity? (E) Would you classify this material as a soft of hard magnetic material? Why?
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Sample question for ChE 350 Spring 2010 Quiz 12 Name:________________________ 2 3. The saturation magnetization versus temperature is shown below for two samples (labeled “a”
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Unformatted text preview: and b) of Co. (a) The atomic number of Co is 27. How many unpaired d electrons are in a Co atom? ________ (b) Based on the number of unpaired d electrons of in a Co atom, how many Bohr magnetons per Co atom would you expect to contribute to the low temperature saturation magnetization of Co metal? (c) Determine the number of Bohr magnetons per Co atom contributing to the saturation magnetization at low temperature of sample b in the data shown below. [Note that 1 emu/g=1 A m 2 /kg; the density of Co is 8.86 g/cm 3 ; the atomic mass of Co is 58.93 g/mol; 2 24 m A 10 27 . 9 = B ....
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Quiz 13 potential problems ChE 350 sp10 - and b) of Co. (a)...

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