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Composition (x) Dependence of Nonstoichiometry (δ) in Ferrite Spinel (MgxFe1−x)3−δO4

✍ Scribed by Sun-Ho Kang; Han-Ill Yoo

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
324 KB
Volume
139
Category
Article
ISSN
0022-4596

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✦ Synopsis

The nonstoichiometry of spinel ferrite (Mg x Fe 1؊x ) 3؊ O 4 has been measured as a function of oxygen activity (a O2 ) and Mg content (x) at 1000°C via coulometric titration. For a given Mg content, the nonstoichiometry varies with the oxygen activity as

O2 , indicating metal vacancies at high a O2 and metal interstitials at low a O2 . As Mg content increases from x ‫؍‬ 0 to x ‫؍‬ 0.29, the defect parameter, [V]°decreases and [I]°increases, respectively, by 2-4 orders of magnitude. This is ascribed to the fact that magnesium ions remain at a fixed valence (Mg 2؉ ) in the spinel. The Mg content dependencies of these defect parameters are discussed in the light of point defect thermodynamics.

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