Structural and transport characteristics of the LAMOX family of fast oxide-ion conductors, based on lanthanum molybdenum oxide La2Mo2O9

Goutenoire, F.; Isnard, O.; Suard, Emmanuelle; Bohnké, O.; Laligant, Y.; Retoux, R.; Lacorre, P.

doi:10.1039/b002962i

Cited by 220 publications

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“…The structure of the cubic form was proposed in 2000 by Lacorre 6 and then revised in 2001 by the same Authors 7 . This was determined by means of neutron diffraction and led the Authors to propose a model where two of the three available oxygen sites (O2 and O3) are partially occupied and characterized by huge atomic displacement parameters (up to BB eq~2 0 Å for the O3 site).…”

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“…The loss of long-range order would allow the structure to become dynamic, consistent with increased ionic conductivity though our current diffraction data do not separate the static and dynamic components explicitly. Finally, on panel C we show the result of a fit of cubic LAMOX carried out using the cubic model 7 . One of the peculiarities of this model is the presence of large atomic displacement parameters (U), particularly for the O2 (U equiv =0.085 Å 2 ) and O3 (U equiv =0.233 Å 2 ) sites.…”

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Nature of the Monoclinic to Cubic Phase Transition in the Fast Oxygen Ion Conductor La₂Mo₂O₉ (LAMOX)

et al. 2007

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La 2 Mo 2 O 9 (LAMOX) is a fast oxygen ion conductor which shows high oxygen ion conductivities comparable to those of yttria-sabilized zirconia (YSZ) . LAMOX is subject to a structural phase transition from the non-conductive monoclinic form to the highly-conductive cubic form at about 580°C. The origin of the conductivity in cubic LAMOX has been suggested to be due to a "disorder" in the O sub-lattice without any insight into the real distribution of the oxygen ion. In this paper, thanks to the application of the neutron atomic pair distribution function (PDF) analysis, we provided evidences that the local structure of the cubic polymorph of LAMOX is exactly the same of that of the monoclinic phase thus indicating that the structural phase transition is actually a transition from a static to a dynamic distribution of the oxygen defects. This work represent the first application of the atomic-pair distribution function analysis to the study of an oxygen fast-oxide ion conductor and clearly indicates that a more reliable and detailed description of their local structure, particularly in the highly conductive phases, and can lead to a better comprehension of the structure-property correlation, which is the starting point for the design of new and optimized functional materials.

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Nature of the Monoclinic to Cubic Phase Transition in the Fast Oxygen Ion Conductor La₂Mo₂O₉ (LAMOX)

et al. 2007

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“…The discovery, in La 2 Mo 2 O 9 , of an oxide-ion conductivity higher than that of stabilized zirconias above 580°C [1] opened the prospect for using this material or its derivatives (the so-called LAMOX family [2]) as electrolyte in intermediate temperature solid oxide fuel cells (ITSOFCs). Indeed, it would lower the cell working temperature by about 150°C in comparison to standard 8mol%YSZ.…”

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Tests for the Use of La₂Mo₂O₉‐based Oxides as Multipurpose SOFC Core Materials

et al. 2010

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International audienceThe mixed ionic-electronic conductivity under dilute hydrogen, the stability and the catalytic activity under propane:air type mixtures of a series of LAMOX oxide-ion conductors have been studied. The effect of exposure to dilute hydrogen on the conductivity of the -La2(Mo2 - yWy)O9 series at 600 °C depends on tungsten content: almost negligible for the highest (y = 1.4), it is important for La2Mo2O9 (y = 0). In propane:air, all tested LAMOX electrolytes are stable at 600-700 °C, but get reduced when water vapour is present. La2Mo2O9 is the best oxidation catalyst of the series, with an activity comparable to that of nickel.The catalytic activity of other tested LAMOX compounds is much lower, (La1.9Y0.1)Mo2O9 showing a deactivation phenomenon. These results suggest that depending on composition, La2(Mo2 - yWy)O9 compounds could be either electrolytes in single-chamber SOFC and dual-chamber micro-SOFC (y = 1.4) or anode materials in dual-chamber SOFC (low y) or oxidation catalysts in SOFCs operating with propane (y = 0)

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“…Dans certains composés, une forte ondulation du bruit de fond peut être observée : c'est par exemple le cas de divers conducteurs ioniques comme la phase Lal 7Bio3Mo209 dont le diagramme de diffraction neutronique est représentée sur la figure 24 [Goutenoire et al 2001]. La présence de bosse de diffusion diffuse dans le bruit de fond a été discutée par Guinier dans son ouvrage de référence [Guinier 1964].…”

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“…Il est possible dans cet exemple de tirer une information structurale quantitative de ce comportement spécifique du fond continu à partir de la formule de Debye [Debye 1915] qui exprime la contribution d'un désordre structural statique à la diffusion diffuse élastique. Dans le cas de la phase Lal 7Bio 3Mo209 [Goutenoire et al 2001], cela traduit l'existence d'ordre à courte distance caractérisé par des paires oxygène-oxygène de l'ordre de 2, 5Â. Sans chercher à être exhaustif, citons que la présence de ce type de diffusion diffuse a aussi été observée en référence [Vannier et al 1999].…”

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Diffusion, diffraction des neutrons en temps réel et études réaliséesin situ

Isnard

2003

J. Phys. IV France

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propos à l'aide d'exemples pris dans des domaines scientifiques divers : électrochimie, magnétisme, métallurgie, chimie du solide. Après avoir présenté quelques repères méthodologiques sur les méthodes d'acquisition de données, des exemples montreront le fort potentiel de la diffusion neutronique en temps réel pour l'étude de la matière dans des conditions dynamiques. Enfin, nous donnerons aussi quelques conseils pour la visualisation, le dépouillement et l'analyse de ce type d'expérience. La diffusion des neutrons sur poudre est actuellement très bien adaptée aux études réalisées in situ. Cependant, nous verrons que la faisabilité d'études in situ s'étend à d'autres techniques expérimentales telles que la diffusion des neutrons aux petits angles et même la diffusion sur monocristal qui est en plein renouveau.

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Structural and transport characteristics of the LAMOX family of fast oxide-ion conductors, based on lanthanum molybdenum oxide La2Mo2O9

Cited by 220 publications

References 14 publications

Nature of the Monoclinic to Cubic Phase Transition in the Fast Oxygen Ion Conductor La₂Mo₂O₉ (LAMOX)

Nature of the Monoclinic to Cubic Phase Transition in the Fast Oxygen Ion Conductor La₂Mo₂O₉ (LAMOX)

Tests for the Use of La₂Mo₂O₉‐based Oxides as Multipurpose SOFC Core Materials

Diffusion, diffraction des neutrons en temps réel et études réaliséesin situ

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Structural and transport characteristics of the LAMOX family of fast oxide-ion conductors, based on lanthanum molybdenum oxide La2Mo2O9

Cited by 220 publications

References 14 publications

Nature of the Monoclinic to Cubic Phase Transition in the Fast Oxygen Ion Conductor La2Mo2O9 (LAMOX)

Nature of the Monoclinic to Cubic Phase Transition in the Fast Oxygen Ion Conductor La2Mo2O9 (LAMOX)

Tests for the Use of La2Mo2O9‐based Oxides as Multipurpose SOFC Core Materials

Diffusion, diffraction des neutrons en temps réel et études réaliséesin situ

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Nature of the Monoclinic to Cubic Phase Transition in the Fast Oxygen Ion Conductor La₂Mo₂O₉ (LAMOX)

Nature of the Monoclinic to Cubic Phase Transition in the Fast Oxygen Ion Conductor La₂Mo₂O₉ (LAMOX)

Tests for the Use of La₂Mo₂O₉‐based Oxides as Multipurpose SOFC Core Materials