Magnetic Susceptibility of Eu2O3

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Abstract
Huang and Van Vleck have recently attributed the ``excess'' in susceptibility of Eu2O3 over that calculated from the spectroscopic data of Eu3+ diluted in Y2O3 to orbitally dependent exchange processes. Measurements of (EuxY1−x)2O3 by Grill and Schieber done above 95°K, on the other hand, have indicated that the susceptibility increases, rather than decreasing to the dilute calculated value, as x decreases. We have carefully remeasured the susceptibility of Eu3+ in Y2O3 down to helium temperatures and found that the susceptibility and crystal‐field splitting remains relatively constant over the entire range of concentration. Calculations have shown that the effects of spin‐orbit and crystal field mixing of states do not explain the magnitude of the discrepancy, nor would the presence of the monoclinic phase of the sesquioxide, which also exhibits a similar ``excess'' of susceptibility over the spectroscopically determined value.

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