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Magnetization measurements have been made on Er-H and Tm-H over the (4.2-120)-K temperature range. Results show that all of the magnetic ordering temperatures decrease with increasing hydrogen concentrations up to the limit of simple solubility where compound formation sets in. The data establish that hydrogen interstitial solubility limits are 3.6 at.% for Er and 7.7 at.% for Tm.
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Ito et al. (1984) studied this question.
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