The effect of partial substitution of Ni by Mg on the structural, magnetic and spectroscopic properties of the double perovskite Sr2NiTeO6

B. Orayech, L. Ortega-San-Martín, I. Urcelay-Olabarria, L. Lezama, T. Rojo, M. I. Arriortua, J. M. Igartua

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

19 Citas (Scopus)

Resumen

In this report, the structural, magnetic and spectroscopic properties of the freeze-drying synthesized Sr2Ni1-xMgxTeO6 (x = 0.0, 0.1, 0.2, 0.3 and 0.5) oxides are analyzed by means of X-ray powder diffraction (XRPD) and neutron powder diffraction (NPD), electron paramagnetic resonance, diffuse reflectance and magnetic susceptibility. The XRPD and NPD data analysis using the mode-crystallography approach have revealed that at room temperature (RT), all the compositions are monoclinically distorted with the space group I2/m. The high and low temperature analyses have shown that these materials suffer a series of three structural phase transitions. The EPR results have shown that the spectra of all the compositions are centred at g ≈ 2.28, indicating a slightly distorted octahedral environment of Ni2+, which is in agreement with the crystal structure analysis. The increase of the Mg2+ content in Sr2Ni1-xMgxTeO6, provokes a decrease of the dipolar interaction effects and thus, the resonance becomes narrower. This resonance does not completely disappear which leads to the idea that the long-range magnetic order is not completely established when x ≥ 0.3. The substitution of the Ni2+ (S = 1) ions by Mg2+ (S = 0) ions, also induces a weakening of the antiferromagnetic interactions, which is reflected in the diminishing of the absolute value of θ and the Néel temperature TN. The magnetic structure determination revealed the existence of an antiferromagnetic coupling for x- and z-spin components of the nickel atoms.
Idioma originalEspañol
Páginas (desde-hasta)14378-14393
Número de páginas16
PublicaciónDalton Transactions
Volumen45
EstadoPublicada - 1 ene. 2016

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