1 research outputs found
Enhancement of Ferroelectricity for Orthorhombic (Tb<sub>0.861</sub>Mn<sub>0.121</sub>)MnO<sub>3−δ</sub> by Copper Doping
Copper-doped (Tb<sub>0.861</sub>Mn<sub>0.121</sub>)ÂMnO<sub>3−δ</sub> has
been synthesized by the conventional solid state reaction method.
X-ray, neutron, and electron diffraction data indicate that they crystallize
in <i>Pnma</i> space group at room temperature. Two magnetic
orderings are found for this series by neutron diffraction. One is
the ICAM (incommensurate canted antiferromagnetic) ordering of Mn
with a wave vector <i>q</i><sub>Mn</sub> = (∼0.283,
0, 0) with <i>a</i> ≈ 5.73 Å, <i>b</i> ≈ 5.31 Å, and <i>c</i> ≈ 7.41 Å,
and the other is the CAM (canted antiferromagnetic) ordering of both
Tb and Mn in the magnetic space group <i>Pn</i>′<i>a2</i><sub>1</sub>′ with <i>a</i> ≈
5.73 Å, <i>b</i> ≈ 5.31 Å, and <i>c</i> ≈ 7.41 Å. A dielectric peak around 40 K is
found for the samples doped with Cu, which is higher than that for
orthorhombic TbMnO<sub>3</sub>