Atomic disorder, magnetic order and phase transitions of TbFe6Ge6 studied by X-ray, neutron diffraction and magnetic measurements (I)

Crystallographic and magnetic properties of HfFe6Ge6-type REFe6Sn4Ge2 compounds (RE=Y, Gd–Er)

“…Several studies have evidenced some problems regarding the crystallographic ordering of the RE sites and have shown partial disorder depending on the thermal history of the samples [6][7][8][9][10]. The magnetic studies suggested an independent magnetic ordering of the RE and Fe sublattices and, in most of the cases, a non-collinear arrangement of the RE moments with a simultaneous presence of ferro-, antiferro-and/or helimagnetic components [8][9][10][11][12][13][14]. These problems are complicated by the presence of several different crystallographic RE sites and by the atomic disorder on these sites.…”

Magnetic properties of TbFe6Sn6 from neutron diffraction and 119Sn Mössbauer spectroscopy

“…5). This kind of ordering is classically observed in all the known HfFe 6 Ge 6 -type RFe 6 X 6 compounds as well as in the already studied compounds RFe 6 X 6 crystallizing in the orthorhombic variants [4][5][6][7][17][18][19]. The absence of the (1 0 0) line indicates that the Fe moments are aligned along [1 0 0], namely along the sixfold axis of the hexagonal subcell.…”

“…The magnetic properties of LFe 6 X 6 compounds (L = Sc, Y, lanthanide; X = Ge, Sn) have been extensively studied by many different research groups [1][2][3][4][5]. The iron sublattice orders well above the room temperature into an antiferromagnetic structure consisting of ferromagnetic iron Kagomé planes antiferromagnetically coupled along the stacking direction.…”

Crystallographic properties of ErFe6Sn6−xGax compounds (0<x<6)

“…Attempts to correlate the stabilisation of the HfFe 6 Ge 6 structure with the size difference between the tin and gallium atoms may be made by considering the knowledge of the crystallographic properties of RT 6 X 6 compounds. The TbFe 6 Sn 6 -type superstructure characterized by an alternate sequence of one HfFe 6 Ge 6 and one ScFe 6 Ga 6 slab has been extensively studied [12][13][14][15]. According to the single crystal refinement of the TbFe 6 Sn 6 -type DyFe 6 Sn 6 compounds, it may be observed that the coordinates of the Dy atoms significantly deviate from the idealized one [15].…”