quiz16 - because Li is a +1 ion and Ni is a +2 Ion. When Li...

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Question 1 2 out of 2 points Which of the following defects might be expected if a small amount of Li 2 O was added to NiO during synthesis of NiO. You may assume the Li is a substitutional impurity for Ni in NiO. Answer Selected Answer: One oxygen vacancy for every two Li substitutional defects. Correct Answer: One oxygen vacancy for every two Li substitutional defects. Response Feedback: Correct Charge neutrality demands that each Li substitutional defect created must be accompanied by a reduction in negative charge in the lattice. This is
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Unformatted text preview: because Li is a +1 ion and Ni is a +2 Ion. When Li sits on a Ni site the lattice has an excess negative charge. That charge can be eliminated by removing one O (-2) ion for every two Li substitutional defect. Question 2 2 out of 2 points For a composition of 40 wt% Al 2 O 3 at 1600 o C in the MgO-Al 2 O 3 phase system, what is the composition of the MgAl 2 O 4 solid solution phase? Answer Selected Answer: 70 wt% Al Correct Answer: 70 wt% Al Response Feedback: Correct. As shown CMgAl20 approximately 70 wt% Al...
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This document was uploaded on 10/26/2011 for the course ENGL 250 at Iowa State.

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quiz16 - because Li is a +1 ion and Ni is a +2 Ion. When Li...

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