Abstract
The structural and magnetic parameters of the Lu 2Fe 17H y , y = 0–1.77 hydrides were studied and compared with those of the Lu 2Fe 17− x Mn x system. The hydrides like their initial compound are ferromagnets at low temperatures and antiferromagnets at high temperatures. Spontaneous magnetization of the hydrides is virtually independent on hydrogen content. The lattice parameters of the Lu 2Fe 17H y hydrides increase relatively fast with y whereas their ferromagnetism, as compared with the Lu 2Fe 17− x Mn x system, strengthens slowly. Hence, there appears an indirect evidence that the unit cell volume increase is not the main reason for the surprising abrupt ferromagnetism strengthening observed in the Lu 2Fe 17− x Mn x system.
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