Abstract
We report the X-ray and neutron diffraction and magnetic measurements of the polycrystalline bulk and nanosize RMnO3 (R = Tb, Dy) compounds synthesized at temperatures of 800 and 850 °C. Diffraction data indicate that all the samples crystallize in the orthorhombic crystal structure (space group Pnma). The crystal structure parameters change slightly with preparation. All the samples are shown to be antiferromagnets. The Mn magnetic moments order near 40 K while the rare earth ones order below 10 K. Macroscopic magnetic and neutron diffraction data indicate the small difference of properties of bulk and nanosamples in the case of DyMnO3 and significant difference in TbMnO3. For nano-TbMnO3, the observed broadening of magnetic peaks suggests the cluster-like character of magnetic ordering.
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