503hw4 - Solution to Homework #4 1. Write the defect...

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Solution to Homework #4 1. Write the defect equations for the following proposed reactions: A. Formation of major defects in PbCl 2 . null V V Pb Cl =+ " 2 B. Formation of major defects in CdO which is an n-type semiconductor. CdO Cd O + •• int 2 1 2 2 Q or CdO V Cd O OC d x + + •• 2 1 2 2 Q C. Doping CoO, a p-type semiconductor, with Li 2 O; with Cr 2 O 3 ; with MnS; and with CoCl 2 . 1 2 2 2 OV O Co O x ¯ + " 1 2 22 2 O Li O Li O Co O x += + ¯ + Cr O Cr V O Co Co O x 23 + " MnS Mn S Co x O x CoCl Cl V Co o C o x 2 2 + " D. Formation of major defects in AgI. AgI V Ag I Ag I x + int (Frenkel) E. Doping AgI with CdI 2 ; with Ag 2 S; and with AgCl. CdI Cd V I Ag Ag I x 2 2 + Ag S S Ag Ag IA g x 2 + int AgCl Ag Cl Ag x I x 2. Obtain an expression for the diffusion coefficient of nickel in NiO as a function of oxygen pressure. NiO — p-type, cation deficient \ 1 2 2 2 OOV O x Ni =++ ¯ " (1) [] KP V ON i 1 12 2 2 &= & ¯ /" (2) 2V Ni " (3) solve for V Ni " from (2) and (3): V K P Ni O "/ 3 1 4 2 =& or V const P Ni O 2 16 (4) DV Ni Ni ± " (5)
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This note was uploaded on 01/19/2010 for the course MAT SCI 503 taught by Professor Chen during the Spring '02 term at Pennsylvania State University, University Park.

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503hw4 - Solution to Homework #4 1. Write the defect...

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