High pressure and high magnetic field experiments have been performed on the ferrimagnetic Er 6 Fe 23 compound. The erbium-iron interaction parameter is found to be independent of pressure, magnetic field and temperature in the range of the experimental facilities (p<or=5 kbar, mu 0 H<or=35 T and 4.2<or=T<or=300K). The relative volume dependence of the iron moment in Er 6 Fe 23 at 4.2K is almost equal to the value in pure iron.
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Frings et al. (1983) studied this question.
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