Correlation between structure and oxygen ion dynamics in Y substituted La2Mo2O9 ionic conductors

Paul, Thierry; Ghosh, A.

doi:10.1063/1.4963199

Cited by 6 publications

(1 citation statement)

References 34 publications

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“…Moreover, La 2 Mo 2 O 9−δ is thermodynamically unstable at low oxygen partial pressures (p O2 ) due to the reducibility of Mo 6+ , resulting in the formation of phases with partial n-type conductivity and amorphization [ 4 , 5 ]. To address these issues, several studies have focused on cation substitutions (W [ 6 , 7 , 8 , 9 , 10 , 11 ], Nd [ 6 ], Ca [ 12 ], Ba [ 12 , 13 ], Sr [ 12 , 14 ], Y [ 15 ], Cr [ 7 , 14 ]) for La or Mo (LAMOX family). These substitutions aim to inhibit the phase transition, stabilize the β-phase, and improve the thermomechanical stability [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

W-doped Lanthanum Molybdenum Oxide/Lithium-Sodium-Potassium Carbonate Composite Membranes for Carbon Dioxide Permeation

Medina¹,

Carvalho²,

Tabuti

et al. 2023

Materials

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Single-phase tungsten-doped lanthanum molybdenum oxide (La2MoWO9) ceramic powders were synthesized using the complex polymerization technique. Porous ceramic pellets were obtained by thermally removing graphite, which served as a pore former. The porous pellets were then impregnated with molten eutectic lithium-sodium-potassium carbonates. The energy dispersive X-ray analysis and scanning electron microscopy (FEG-SEM) images of the external and fracture surfaces of the La2MoWO9-(Li,Na,K)2CO3 composite dual-phase membrane revealed the percolation of the carbonate mixture through the pores. Electrochemical impedance spectroscopy measurements conducted at temperatures below and above the melting point of the eutectic carbonate composition demonstrated the contributions of oxygen and carbonate ions to the ionic conductivity of the dual membrane. The electrical conductivity of the carbonate ions within the membrane was continuously monitored for over 1300 h with negligible degradation, implying that the membrane could be used for long-term monitoring of CO2 without aging effects. A comparison of FEG-SEM images taken before and after this endurance test suggested minimal fouling, indicating that the membrane could potentially replace similar zirconia- and ceria-based composite membranes.

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Section: Introductionmentioning

confidence: 99%

W-doped Lanthanum Molybdenum Oxide/Lithium-Sodium-Potassium Carbonate Composite Membranes for Carbon Dioxide Permeation

Medina¹,

Carvalho²,

Tabuti

et al. 2023

Materials

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Dielectric behavior and phase transition of La2Mo2O9 films synthesized by spray pyrolysis technique

Kadam¹,

Patil

Patil³

et al. 2023

J Mater Sci: Mater Electron

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A study on Ti-doped Fe3O4 anode for Li ion battery using machine learning, electrochemical and distribution function of relaxation times (DFRTs) analyses

Chi

Paul

et al. 2022

Sci Rep

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Among many transition-metal oxides, Fe3O4 anode based lithium ion batteries (LIBs) have been well-investigated because of their high energy and high capacity. Iron is known for elemental abundance and is relatively environmentally friendly as well contains with low toxicity. However, LIBs based on Fe3O4 suffer from particle aggregation during charge–discharge processes that affects the cycling performance. This study conjectures that iron agglomeration and material performance could be affected by dopant choice, and improvements are sought with Fe3O4 nanoparticles doped with 0.2% Ti. The electrochemical measurements show a stable specific capacity of 450 mAh g−1 at 0.1 C rate for at least 100 cycles in Ti doped Fe3O4. The stability in discharge capacity for Ti doped Fe3O4 is achieved, arising from good electronic conductivity and stability in microstructure and crystal structure, which has been further confirmed by density functional theory (DFT) calculation. Detailed distribution function of relaxation times (DFRTs) analyses based on the impedance spectra reveal two different types of Li ion transport phenomena, which are closely related with the electron density difference near the two Fe-sites. Detailed analyses on EIS measurements using DFRTs for Ti doped Fe3O4 indicate that improvement in interfacial charge transfer processes between electrode and Li metal along with an intermediate lithiated phase helps to enhance the electrochemical performance.

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Correlation between structure and oxygen ion dynamics in Y substituted La2Mo2O9 ionic conductors

Cited by 6 publications

References 34 publications

W-doped Lanthanum Molybdenum Oxide/Lithium-Sodium-Potassium Carbonate Composite Membranes for Carbon Dioxide Permeation

W-doped Lanthanum Molybdenum Oxide/Lithium-Sodium-Potassium Carbonate Composite Membranes for Carbon Dioxide Permeation

Dielectric behavior and phase transition of La2Mo2O9 films synthesized by spray pyrolysis technique

A study on Ti-doped Fe3O4 anode for Li ion battery using machine learning, electrochemical and distribution function of relaxation times (DFRTs) analyses

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