Ba-doping effects on structural, magnetic and vibrational properties of disordered La2NiMnO6
Barium-doped La2NiMnO6 double perovskites have been investigated in order to elucidate the role of the B-site doping on its magnetic, dielectric and vibrational properties. In all cases, we have obtained a non-linear dependence with the Barium content signaling that a 5% molar doping renders the maximum B-site ordering. By analyzing a series of gradually doped samples, we have found that the effective magnetic moment in the B-site can be enhanced by a factor of nearly 100% by 5% Ba doping. In order to exclude oxidation state induce changes, XPS and XANES measurements have been carried out concluding that nickel or manganese oxidation states ratio are not modified by the Ba doping. Raman spectroscopy correlates Ba doping with vacancies thus attributing to the latter the role of primary source for structural defects in Ba-La2NiMnO6 samples. This manuscript summarizes key consequences of the B-site ordering which are crucial to address the optimization of the magneto-electric coupling in Ba-La2NiMnO6 double perovskites.
Journal of Alloys and Compounds
Digital Object Identifier (DOI)
Barbosa, Lufaso, M. W., Reichlova, H., Marti, X., Rezende, M. V. ., Maciel, A. P., & Paschoal, C. W. . (2016). Ba-doping effects on structural, magnetic and vibrational properties of disordered La2NiMnO6. Journal of Alloys and Compounds, 663, 899–905. https://doi.org/10.1016/j.jallcom.2015.11.099