Magnetic Phase Diagrams of Tm2Fe19-xMnx and Tm2Fe17+δ Systems

Anatoly G. Kuchin; Alexandr M. Gabay; Galina M. Makarova; Vladimir I. Voronin; Ivan F. Berger; Sergey P. Platonov; Alexey S. Volegov

doi:10.4028/www.scientific.net/SSP.215.123

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Magnetic Phase Diagrams of Tm₂Fe_19-xMn_x and Tm₂Fe_17+δ Systems

Abstract:

The Tm₂Fe_19-xMn_x (x = 0 - 1.5) and Tm₂Fe₁₆, Tm₂Fe₁₇, Tm₂Fe₁₈, Tm₂Fe₁₉intermetallic compounds were synthesized and their magnetic and structural properties were studied. Magnetic measurements, X-ray and neutron diffraction investigations were used. The compounds crystallize in a disordered variant of the hexagonal Th₂Ni₁₇-type structure. The lattice parameters a, c increases in the Tm₂Fe_19-xMn_xsystem, whereas c decreases and a increases in the Tm₂Fe₁₉- Tm₂Fe₁₆ system as Fe content decreases. The temperatures of ferromagnetic ordering and spin-reorientation increase as Fe content decreases in these systems. Apparently, the decrease of occupation of defected dumbbell Fe (4e) site causes these regularities.