Designing fast oxide-ion conductors based on La2Mo2O9

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

doi:10.1038/35009069

Cited by 681 publications

(494 citation statements)

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“…[1][2][3][4][5][6] Nanostructures (nanoparticles, nanowires, and nanobelts) of complex oxides have attracted much attention because of their size-induced novel properties. Although some synthesis methods are successful for fabricating single-cation oxide nanocrystals, [7][8][9][10][11][12][13][14] only a limited amount of work is available for synthesizing nanostructures of complex oxides (with two or more types of cations) because of difficulties in controlling the composition, stoichiometry, and/or crystal structure.…”

mentioning

confidence: 99%

Composite-Hydroxide-Mediated Approach for the Synthesis of Nanostructures of Complex Functional-Oxides

2006

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We demonstrate a generic approach for the synthesis of single-crystal complex oxide nanostructures of various structure types, such as perovskites, spinels, monoclinic, corundum, CaF 2 structured, tetragonal, and even metal hydroxides. The method is based on a reaction between a metallic salt and a metallic oxide in a solution of composite-hydroxide eutectic at ∼200°C and normal atmosphere without using an organic dispersant or capping agent. The synthesis technique is cost-effective, one-step, easy to control, and is performed at low temperature and normal atomospheric pressure. The technique can be expanded to many material systems, and it provides a general, simple, convenient, and innovative strategy for the synthesis of nanostructures of complex oxides with important scientific and technological applications in ferroelectricity, ferromagnetism, colossal magnetoresistance, fuel cell, optics, and more.Complex oxides with structures such as perovskite, spinel, and garnet have many important properties and applications in science and engineering, such as ferroelectricity, ferromagnetism, colossal magnetoresistance, semiconductors, luminance, and optoelectronics. 1-6 Nanostructures (nanoparticles, nanowires, and nanobelts) of complex oxides have attracted much attention because of their size-induced novel properties. Although some synthesis methods are successful for fabricating single-cation oxide nanocrystals, 7-14 only a limited amount of work is available for synthesizing nanostructures of complex oxides (with two or more types of cations) because of difficulties in controlling the composition, stoichiometry, and/or crystal structure. The existing techniques rely on high pressure, salt-solvent-mediated high temperature, surface-capping agent, or organometallic precursormediated growth process, 15-24 and the types of oxides that can be synthesized are rather limited. Therefore, seeking a simple approach for low-cost, lower-temperature, large-scale, controlled growth of oxide nanostructures at atmospheric pressure is highly desired, and it is important for exploring zero-and one-dimensional complex oxide-based nanostructures for applications in nanodevices and nanosystems.Here we report a general and widely applicable approach for the synthesis of complex oxide nanostructures of scientific and technological importance. The method is based on a reaction between a metallic salt and a metallic oxide in a solution of molten mixed potassium hydroxide and sodium hydroxide eutectic at ∼200°C and normal atmosphere without using an organic dispersant or capping agent. This methodology provides a one-step, convenient, low-cost, nontoxic, and mass-production route for the synthesis of nanostructures of functional oxide materials of various structure types.We now use the synthesis of two families of complex oxides, perovskite (ABO 3 ; A x A′ 1-x BO 3 ; AB x B′ 1-x O 3 ) 25 and spinel (AB 2 O 4 ), to illustrate the principle and applications of the approach. The sources of A and A′ cations are from metallic salts, ...

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Composite-Hydroxide-Mediated Approach for the Synthesis of Nanostructures of Complex Functional-Oxides

2006

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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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“…La 2 Mo 2 O 9 is an outstanding oxide‐ion conductor, with a two orders of magnitude increase in conductivity at ≈580 °C, at which the monoclinic α‐La 2 Mo 2 O 9 transforms to cubic β‐La 2 Mo 2 O 9 88, 89. The oxide‐ion conductivity of β‐La 2 Mo 2 O 9 originates from the structure of α‐La 2 Mo 2 O 9 .…”

Section: Upconversion Of Ln3+ Tuned By Tm or D 0 Ionsmentioning

confidence: 99%

Transition Metal‐Involved Photon Upconversion

Song

Zhang

2016

Advanced Science

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Upconversion (UC) luminescence of lanthanide ions (Ln3+) has been extensively investigated for several decades and is a constant research hotspot owing to its fundamental significance and widespread applications. In contrast to the multiple and fixed UC emissions of Ln3+, transition metal (TM) ions, e.g., Mn2+, usually possess a single broadband emission due to its 3d 5 electronic configuration. Wavelength‐tuneable single UC emission can be achieved in some TM ion‐activated systems ascribed to the susceptibility of d electrons to the chemical environment, which is appealing in molecular sensing and lighting. Moreover, the UC emissions of Ln3+ can be modulated by TM ions (specifically d‐block element ions with unfilled d orbitals), which benefits from the specific metastable energy levels of Ln3+ owing to the well‐shielded 4f electrons and tuneable energy levels of the TM ions. The electric versatility of d 0 ion‐containing hosts (d 0 normally viewed as charged anion groups, such as MoO6 6‐ and TiO4 4‐) may also have a strong influence on the electric dipole transition of Ln3+, resulting in multifunctional properties of modulated UC emission and electrical behaviour, such as ferroelectricity and oxide‐ion conductivity. This review focuses on recent advances in the room temperature (RT) UC of TM ions, the UC of Ln3+ tuned by TM or d 0 ions, and the UC of d 0 ion‐centred groups, as well as their potential applications in bioimaging, solar cells and multifunctional devices.

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Designing fast oxide-ion conductors based on La2Mo2O9

Cited by 681 publications

References 15 publications

Composite-Hydroxide-Mediated Approach for the Synthesis of Nanostructures of Complex Functional-Oxides

Composite-Hydroxide-Mediated Approach for the Synthesis of Nanostructures of Complex Functional-Oxides

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

Transition Metal‐Involved Photon Upconversion

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Designing fast oxide-ion conductors based on La2Mo2O9

Cited by 681 publications

References 15 publications

Composite-Hydroxide-Mediated Approach for the Synthesis of Nanostructures of Complex Functional-Oxides

Composite-Hydroxide-Mediated Approach for the Synthesis of Nanostructures of Complex Functional-Oxides

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

Transition Metal‐Involved Photon Upconversion

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