Effect of transition metal doping on the crystal structure and oxidation state of Sr2MgMo0.9TM0.1O6-δ compounds (TM = Co, Mn or Ni)

被引：3
作者：
Dager, P. K. [1 ]
Mogni, L., V [1 ,2 ]
Zampieri, G. [1 ,2 ]
Tobia, D. [1 ,2 ]
Caneiro, A. [1 ,2 ]
机构：
[1] Comis Nacl Energia Atom, Ctr Atom Bariloche, Av E Bustin 9500,R8402AGP, San Carlos De Bariloche, Rio Negro, Argentina
[2] Consejo Nacl Invest Cient & Tecn, Av Rivadavia 1917,C1033AAJ, Buenos Aires, DF, Argentina
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2019年 / 135卷
关键词：
Sr2MgMoO6-delta; Crystalline structure; Electronic state; Transition metal doping; ANODE MATERIALS; ELECTRICAL-PROPERTIES; PHASE-STABILITY; SOFC-ANODE; SR2MGMOO6-DELTA;
D O I：
10.1016/j.jpcs.2019.109084
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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-delta (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 degrees C showed that Sr2MgMoO6-delta and SMMTM have a face-centred cubic structure in both air and a 5% H-2 atmosphere. Thermogravimetric analysis in oxidizing and reducing atmospheres at 800 degrees C indicated that the oxygen-vacancies concentration (delta) and its variation (Delta delta) 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.
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页数：7
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