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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
Problem 18.47 noted that FeO (wustite) may behave as a semiconductor by virtue of the transformation of Fe2+ to Fe3+ and the creation of Fe2+ vacancies; the maintenance of electro neutrality requires that for every two Fe3+ ions, one vacancy is formed. The existence of these vacancies is reflected in the chemical formula of this nonstoichiometric wustite as Fe(1 – x)O, where x is a small number having a value less than unity. The degree of nonstoichiometry (i.e., the value of x) may be varied by changing temperature and oxygen partial pressure. Compute the value of x that is required to produce an Fe(1 – x)O material having a p-type electrical conductivity of 2000 (ohm-m)-1; assume that the hole mobility is 1.0 x 10-5 m2/V-s, the crystal structure for FeO is sodium chloride (with a unit cell edge length of 0.437 nm), and that the acceptor states are saturated.
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