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Low temperature phase transitions of the SrMo1-xMxO3-δ (M = Mg and Ga) perovskites

AuthorsCascos, Vanessa ; Alonso, J. A.
KeywordsPhase transition
Neutron diffraction
Issue Date25-Oct-2017
CitationJournal of Alloys and Compounds 722: 482-488 (2017)
AbstractSrMoMgO and SrMoGaO (x = 0.1 and 0.2) compounds have been demonstrated to possess excellent properties as anode materials in SOFC. Additionally, these perovskite oxides, cubic at room temperature, exhibit low-temperature phase transitions that have been characterized by neutron powder diffraction (NPD) at 298, 200 and 2 K. Two phase transitions have been identified in both families: one to a tetragonal structure with I4/mcm space group and the second one to an orthorhombic Imma phase. The first one was observed near 270 K by an inflection in the magnetic susceptibility; the second one occurs between 200 and 2 K. The sequence involves a progressive increase of the (Mo,Mg)O or (Mo,Ga)O octahedra rotation, throughout one (I4/mcm) or two (Imma) of the pseudocubic axes. The magnetic properties suggest a Pauli paramagnetism for all the compounds.
Publisher version (URL)https://doi.org/10.1016/j.jallcom.2017.06.026
Identifiersdoi: 10.1016/j.jallcom.2017.06.026
issn: 0925-8388
Appears in Collections:(ICMM) Artículos
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