Gustavo S. Dias, Luiz Gustavo D. Silveira, Luiz F. Cótica, Ivair A. Santos, Adelino A. Coelho, Ducinei Garcia, José A. Eiras e Juraci A. Sampaio

Scripta Materialia – Volume: 89; Pages: 65–68; DOI: 10.1016/j.scriptamat.2014.06.028

Nanostructured orthorhombic TbMnO₃ polycrystals were synthesized by high-energy ball milling and annealing in Ar or O₂ atmospheres. Oxygen annealed samples show shrunken unit cells in comparison with Ar annealed ones, without Mn valence changes in both cases. Magnetic and dielectric investigations show strong evidence of long-range (43 K) and quasi-long-range (9 K) ordering for Mn and Tb ions, respectively, and a noncollinear spin-spiral magnetic ordering of Mn spins, with higher magnetic response and ferroelectric state for argon synthesized samples.

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