Abstract
Owing to the fascinating structural and physical properties of Mn5Si3 type quasibinary compounds, in this work a set of quasibinary Mn5Si3-type Gd5{Si, Ge}3-x{Al, Ga}x, Gd5Sb2{Si, Bi}, Gd5Bi2Ga, Gd5Bi1.8Sn1.2, Tb5Bi2Sn, Tb5Sb2Bi, Dy5Sb1.6-1.7{Si, Ge}1.4-1.3, Dy5{Sb, Bi}2In, Dy5Sb1.5Bi1.5, Dy5Sb1.3Te1.7 compounds (P63/mcm, N 193, hP16) have been synthesized by arc melting under argon atmosphere followed by annealing between 870 and 1070 K. These compounds belong to the continuous or limited solid solutions rows of initial Mn5Si3-type binary compounds with corresponding change/distortion of initial unit cells.Neutron diffraction study in zero applied magnetic field shows sine modulated antiferromagnetic ordening of quasibinary Tb5Sb2Bi with wave vector Kxx = [±Kx, ±Kx, 0] (Kx = 0.0869–0.1356) below ∼90 K and non-collinear antiferromagnetic ordering with additional Kz = [0, 0, 1/2] wave vector below ∼50 K as a representative of magnetic ordering of Tb sublattice in the Mn5Si3-type compounds.
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