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W\"ustite (FeₓO) has been studied under static high pressure in the composition range x0ex0ex=0ex0ex0.95--0.99. Fe0.99O is substantially less compressible than FeₓO with $x<0.98$. Such observations provide the only direct evidence of a significant effect of defect concentration on the elastic properties and support the results of crystal-field modeling for ideal stoichiometric w\"ustite. The bulk moduli of FeₓO show a discontinuous variation at compositions that are within the predicted range for the defect clusters to form, a behavior that may be caused by an order-disorder transition of the defect structure.
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Jianzhong Zhang (2000) studied this question.
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