Novel RNi6Si6 compounds adoptthenewCeNi6Si6-type structurefor R¼La–Ce (tP52, spacegroup P4/nbm N 125-1)andnewYNi6Si6-type structurefor R¼Y,Sm,Gd–Yb (tP52, spacegroup P4b2N 117)thatare tetragonalderivativeofNaZn13-type structure,likeLaCo9Si4-type. The CeNi6Si6, GdNi6Si6, TbNi6Si6, DyNi6Si6 and HoNi6Si6 compounds areCurie–Weissparamagnets down to 30 K,anddonotordermagneticallydownto5K.However,theinverseparamagnetic susceptibility ofLaNi6Si6 does notfollowCurie–Weisslaw. The DyNi6Si6 showsferromagnetic-likesaturationbehaviourat5Kinapplied fields of50kOe,giving rise toamagneticmomentvalueof6.5 μB/f.u. in50kOe.Thepowderneutrondiffractionstudyinzero applied filed indicatessquaremodulatedthe c-collinear antiferromagneticorderingofTbNi6Si6 with K¼[71/4, 71/4, 0]wavevectorbelow 10 K.
New tetragonal derivatives of cubic NaZn13-type structure: RNi6Si6 compounds, crystal structure and magnetic ordering (R=Y, La, Ce, Sm, Gd-Yb)
PANI, MARCELLA;MANFRINETTI, PIETRO;PROVINO, ALESSIA;
2013-01-01
Abstract
Novel RNi6Si6 compounds adoptthenewCeNi6Si6-type structurefor R¼La–Ce (tP52, spacegroup P4/nbm N 125-1)andnewYNi6Si6-type structurefor R¼Y,Sm,Gd–Yb (tP52, spacegroup P4b2N 117)thatare tetragonalderivativeofNaZn13-type structure,likeLaCo9Si4-type. The CeNi6Si6, GdNi6Si6, TbNi6Si6, DyNi6Si6 and HoNi6Si6 compounds areCurie–Weissparamagnets down to 30 K,anddonotordermagneticallydownto5K.However,theinverseparamagnetic susceptibility ofLaNi6Si6 does notfollowCurie–Weisslaw. The DyNi6Si6 showsferromagnetic-likesaturationbehaviourat5Kinapplied fields of50kOe,giving rise toamagneticmomentvalueof6.5 μB/f.u. in50kOe.Thepowderneutrondiffractionstudyinzero applied filed indicatessquaremodulatedthe c-collinear antiferromagneticorderingofTbNi6Si6 with K¼[71/4, 71/4, 0]wavevectorbelow 10 K.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
