Journal ArticleDOI
Crystal Structure of La2Mo2O9, a New Fast Oxide−Ion Conductor
TLDR
In this article, the crystal structure of the new fast oxide-ion conductor La2Mo2O9 (ionic conductivity of 0.06 S cm-1 at 800 °C) has been studied.Abstract:
The crystal structure of the new fast oxide-ion conductor La2Mo2O9 (ionic conductivity of 0.06 S cm-1 at 800 °C) has been studied. This compound presents a reversible phase transformation around 580 °C from a low-temperature form α-La2Mo2O9 to a high-temperature form β-La2Mo2O9. The high-temperature form β-La2Mo2O9 has a cubic structure (at 617 °C, space group P213; a = 7.2014(5) A; Z = 2; RBragg = 5.8%, Rp = 10.9%, Rwp = 6.5%, χ2 = 7.7) which derives from that of β-SnWO4. Partial site occupation by oxygen atoms, strongly anisotropic thermal factors, and short-range order with a distance characteristic of O−O pairs have been evidenced. An original concept is proposed for the origin of oxide−ion conduction in this compound, which could be applied to the design of new oxide−ion conductors. The low-temperature form α-La2Mo2O9 exhibits a slight monoclinic distortion and a large superstructure relative to β-La2Mo2O9 (2 × 3 × 4), most probably due to the localization of oxygen atoms. The large cell (∼8800 A3) d...read more
Citations
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Progress in material selection for solid oxide fuel cell technology: A review
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Transport properties of solid oxide electrolyte ceramics: a brief review
TL;DR: In this paper, a comparative analysis of oxygen ionic conductivity, electronic transport properties and thermal expansion of solid electrolyte ceramics, providing a brief overview of the materials having maximum potential performance in various high-temperature electrochemical devices, such as solid oxide fuel cells (SOFCs).
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Oxide-ion and proton conducting electrolyte materials for clean energy applications: structural and mechanistic features
TL;DR: This critical review presents an overview of the various classes of oxide materials exhibiting fast oxide-ion or proton conductivity for use as solid electrolytes in clean energy applications such as solid oxide fuel cells.
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Hierarchy of Supramolecular Synthons: Persistent Carboxylic Acid···Pyridine Hydrogen Bonds in Cocrystals That also Contain a Hydroxyl Moiety
TL;DR: In this paper, the authors evaluate the hierarchy of supramolecular heterosynthons that involve two of the most relevant functional groups in the context of active pharmaceutical ingredients, carboxylic acids and alcohols, in competitive environments.
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Oxygen ion conductors
TL;DR: In this article, the authors review the materials currently under development for application in such devices with particular reference to some of the newly discovered oxide ion conductors, which offer the potential of enormous commercial and ecological benefits provided suitable high performance materials can be developed.
References
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Journal ArticleDOI
Designing fast oxide-ion conductors based on La2Mo2O9
TL;DR: A family of solid oxides based on the parent compound La2Mo 2O9 (with a different crystal structure from all known oxide electrolytes) which exhibits fast oxide-ion conducting properties and is comparable to that of stabilized zirconia, the most widely used oxide electrolyte.
Journal ArticleDOI
Recent Material Developments in Fast Oxide Ion Conductors
J. C. Boivin,G. Mairesse +1 more
TL;DR: In this paper, a review of conductors with high oxide ion mobility at low temperature is presented and their performances and limitations are presented and discussed, as well as their structure type.
Journal ArticleDOI
Recent developments in perovskite-based oxide ion conductors
TL;DR: In this paper, the role of the oxygen vacancies with respect to the ionic conductivity in perovskites and brownmillerite phases is discussed in detail, and the structures of these phases containing oxygen vacancies are surveyed.