info:eu-repo/semantics/article
Effect of transition metal doping on the crystal structure and oxidation state of Sr2MgMo0.9TM0.1O6− compounds (TM = Co, Mn or Ni)
Fecha
2019-12Registro en:
Dager Caballero, Paola Katherine; Mogni, Liliana Verónica; Zampieri, Guillermo Enrique; Tobia, Dina; Caneiro, Alberto; Effect of transition metal doping on the crystal structure and oxidation state of Sr2MgMo0.9TM0.1O6− compounds (TM = Co, Mn or Ni); Pergamon-Elsevier Science Ltd; Journal of Physics and Chemistry of Solids; 135; 12-2019; 1-7
0022-3697
CONICET Digital
CONICET
Autor
Dager Caballero, Paola Katherine
Mogni, Liliana Verónica
Zampieri, Guillermo Enrique
Tobia, Dina
Caneiro, Alberto
Resumen
We analyse the effects of the partial replacement of Mo by transition metals (Co, Mn or Ni) on the electronic and structural properties of Sr2MgMo0.9TM0.1O6−δ (SMMTM; TM is Co, Mn or Ni) compounds. The crystal structure and electronic state adopted by SMMTM compounds at high temperature in oxidizing and reducing atmospheres were studied by the combination of thermogravimetric analysis, X-ray diffraction at high temperature in a controlled atmosphere, X-ray photoelectron spectroscopy and electron paramagnetic resonance measurements. X-ray diffraction patterns at 800 °C showed that Sr2MgMoO6−δ and SMMTM have a face-centred cubic structure in both air and a 5% H2 atmosphere. Thermogravimetric analysis in oxidizing and reducing atmospheres at 800 °C indicated that the oxygen-vacancies concentration (δ) and its variation (Δδ) between an oxidizing atmosphere and a reducing atmosphere increase because of TM doping. X-ray photoelectron spectroscopy and electron paramagnetic resonance measurements showed that doping with TM also promotes an increase of the Mo5+ content in these double perovskites.