Effect of the synthesis atmosphere on the magnetic and structural properties of TbMnO3 multiferroic polycrystals

FUNDAÇÃO ARAUCÁRIA DE APOIO AO DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO DO ESTADO DO PARANÁ - FAPPRFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPNanostructured 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. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights.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.896568FUNDAÇÃO ARAUCÁRIA DE APOIO AO DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO DO ESTADO DO PARANÁ - FAPPRFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPFUNDAÇÃO ARAUCÁRIA DE APOIO AO DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO DO ESTADO DO PARANÁ - FAPPRFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP408122008/04025 – 5Fiebig, M., Lottermoser, T., Frohlich, D., Goltesev, A., Pisarev, R., (2001) Nature, 419, p. 818Hill, N.A., (2000) J. Phys. Chem. B, 104, pp. 6694-6709Brinks, H.W., Rodríguez-Carvajal, J., Fjellvag, H., Kjekshus, A., Hauback, B.C., (2001) Phys. Rev. B, 63, p. 094411Kenzelmann, M., Harris, A.B., Jonas, S., Broholm, C., Schefer, J., Kim, S.B., Zhang, C.L., Lynn, J.W., (2005) Phys. Rev. Lett., 95, p. 087206Bazela, W., Dul, M., Dyakonov, V., Gondek, Ł., Hoser, A., Hoffmann, J.-U., Penc, B., Zarzycki, A., (2012) Acta Phys. Pol., A, 122, p. 384Kimura, T., Lawes, G., Goto, T., Tokura, Y., Ramirez, A.P., (2005) Phys. Rev. B, 71, p. 224425Tokura, Y., Seki, S., (2010) Adv. Mater., 22, pp. 1554-1565Gotardo, R.A.M., Zabotto, F.L., Garcia, D., Eiras, J.A., Dias, G.S., Cótica, L.F., Santos, I.A., Coelho, A.A., (2013) Scripta Mater., 68, pp. 293-296Izumi, F., Momma, K., (2007) Solid State Phenom., 130, p. 15Toraya, H., (1990) J. Appl. Cryst., 23, p. 485Tolentino, H.C.N., Ramos, A.Y., Alves, M.C.M., Barrea, R.A., Tamura, E., Cezar, J.C., Watanabe, N., (2001) J. Synchrotron Rad., 8, p. 1040Alves, M.F.S., Gotardo, R.A.M., Cótica, L.F., Santos, I.A., Nascimento, W.J., Garcia, D., Eiras, J.A., (2012) Scripta Mater., 66, pp. 1053-1056Silveira, L.G.D., Alves, M.F.S., Cótica, L.F., Gotardo, R.A.M., Nascimento, W.J., Garcia, D., Eiras, J.A., Santos, I.A., (2013) Mater. Res. Bull., 48, pp. 1772-1777Nouri, A., Hodgson, P.D., Wen, C., (2011) Mater. Sci. Eng., C, 31, pp. 921-928Suryanarayana, C., (2001) Prog. Mater Sci., 46, pp. 1-184Dyakonov, V., Szytula, A., Szymczak, R., Zubov, E., Szewczyk, A., Kravchenko, Z., Bazela, W., Szymczak, H., (2012) Low Temp. Phys., 38, p. 216Staruch, M., Lawes, G., Kumarasiri, A., Cotica, L.F., Jain, M., (2013) Appl. Phys. Lett., 102, p. 062908Alonso, J.A., Martínez-Lope, M.J., Casais, M.T., Fernández- Dáz, M.T., (2000) Inorg. Chem., 39, p. 917Alonso, J.A., Martínez-Lope, M.J., Casais, M.T., Macmanus-Driscoll, J.L., De Silva, P.S.I.P.N., Cohen, L.F., Fernández-Díaz, M.T., (1997) J. Mater. Chem., 7, pp. 2139-2144Tofield, B.C., Scott, W.R., (1974) J. Solid State Chem., 10, pp. 183-194Silveira, L.G.D., Dias, G.S., Cótica, L.F., Eiras, J.A., Garcia, D., Sampaio, J.A., Yokaichiya, F., Santos, I.A., (2013) J. Phys.: Condens. Matter, 25, p. 475401Spaldin, N., (2003) Magnetic Materials, , second ed. Cambridge University Press CambridgeKimura, T., Ishihara, S., Shintani, H., Arima, T., Takahashi, K.T., Ishizaka, K., Tokura, Y., (2003) Phys. Rev. B, 68, pp. 060403RMochizuki, M., Furukawa, N., (2009) Phys. Rev. B, 80, p. 134416Mochizuki, M., Furukawa, N., Nagaosa, N., (2010) Phys. Rev. Lett., 105, p. 037205Mochizuki, M., Furukawa, N., Nagaosa, N., (2011) Phys. Rev. B, 84, p. 144409The authors would like to thank Fundacao Araucaria (Prot. 40812), and FAPESP (proc. 2008/04025 - 5), Brazilian funding agencies, and the Brazilian Synchrotron Light Laboratory, for providing HR-XPD and XAFS facilities