Abstract
Investigated in this paper, the poly- and nanocrystalline TbMnO3 samples crystallize in the orthorhombically distorted perovskite structure (space group Pnma, No. 62). The Tb atoms and O1 atoms are in 4(c) site, Mn atoms in 4(b) site, and O2 atoms in 8(d) site. All the samples exhibit antiferromagnetic ordering below different Néel temperatures: 7 K (Tb) and 41 K (Mn). The Tb3+ and Mn3+ moments form similar sine-modulated magnetic structures described by the propagation vector k = (k x,0,0) with the different values of the kx component.
On the basis of neutron diffraction data, the Mn-O bond lengths, Mn-O-Mn bond angles, Jahn-Teller distortion parameter (JT), MnO6 octahedron distortion parameter (delta), and unit cell volume distortion (D) for the poly- and nanocrystalline TbMnO3 samples are determined. Also we have discussed the influence of the internal structural parameters (Mn-O bond lengths and Mn-O-Mn bond angles) on the magnetic interactions in Mn sublattice for the polycrystalline and nanopowder TbMnO3 samples.
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Bażela, W., Dul, M., Szytuła, A., Dyakonov, V. (2017). Grain Size Effect on Crystal Microstructure of the Nanoparticle TbMnO3 Manganite. In: Fesenko, O., Yatsenko, L. (eds) Nanophysics, Nanomaterials, Interface Studies, and Applications . NANO 2016. Springer Proceedings in Physics, vol 195. Springer, Cham. https://doi.org/10.1007/978-3-319-56422-7_33
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