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quiz11spr2000b - ENGSC 3313 Spring 2000 Answer anv 4...

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ENGSC 3313, Spring 2000 Quiz 11 Name Answer anv 4 ouestions onlv. 1 point each The 3d and 4s bands of Fe, Co, Ni showing splitting into 2 half bands. spin-up and the 3d band such that on match up at the Fenni energy level more 3d electrons are spinning one way than the other. The difference leads to ferromagnetism. It seems that the difference in 3d half band occupancy is greater for Fe than Co than Ni, hence the extent of magnetization is greater for Fe than Co tha Ni. Figure 3.9 Schematic density of states graphs for nickel, cobalt and iron. The energy splitting between + and -directions is a measure of the exchange energy. 2. Note that some metals are diamagnetic. The diamagnetic contribution may exceed the paramagnetic contribution most simply if the free-electron paramagnetism is especially small, as when the densitY of states is low. The metal beryllium illustrates this best. Explain! (For elements like copper, the recently filled d shell dominates the partly filled s shell).
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