Synthesis, oxygen nonstoichiometry and total conductivity of (La,Sr)2(Mn,Ni)O4±

Gilev, A.R.; Kiselev, E.A.; Черепанов, В.А.

doi:10.1016/j.ssi.2015.07.017

Cited by 23 publications

(3 citation statements)

References 42 publications

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“…This fact can be explained by considering both the defect structure features for layered nickelates and the anti-Frenkel disordering (Equation (3)) and also by taking into account oxidation reactions [52,53]. When considering the formation of both localized and delocalized electron holes, the oxidation reactions for this case can be written as follows:…”

Section: Oxygen Over-stoichiometry Studiesmentioning

confidence: 99%

Correlation between Structural and Transport Properties of Ca-Doped La Nickelates and Their Electrochemical Performance

et al. 2021

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This work presents the results from a study of the structure and transport properties of Ca-doped La2NiO4+δ. La2−xCaxNiO4+δ (x = 0–0.4) materials that were synthesized via combustion of organic-nitrate precursors and characterized by X-ray diffraction (XRD), in situ XRD using synchrotron radiation, thermogravimetric analysis (TGA) and isotope exchange of oxygen with C18O2. The structure was defined as orthorhombic (Fmmm) for x = 0 and tetragonal (I4/mmm) for x = 0.1–0.4. Changes that occurred in the unit cell parameters and volume as the temperature changed during heating were shown to be caused by the excess oxygen loss. Typical for Ruddlesden–Popper phases, oxygen mobility and surface reactivity decreased as the Ca content was increased due to a reduction in the over-stoichiometric oxygen content with the exception of x = 0.1. This composition demonstrated its superior oxygen transport properties compared to La2NiO4+δ due to the enhanced oxygen mobility caused by structural features. Electrochemical data obtained showed relatively low polarization resistance for the electrodes with a low Ca content, which correlates well with oxygen transport properties.

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Section: Oxygen Over-stoichiometry Studiesmentioning

confidence: 99%

Correlation between Structural and Transport Properties of Ca-Doped La Nickelates and Their Electrochemical Performance

et al. 2021

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“…The TEC values obtained from the HT XRPD results were calculated in approximation of non-textured polycrystalline materials with randomly oriented crystallites [11] according to the formula presented elsewhere [9]. The intermediate temperature Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…The series of the La 1.5 Sr 0.5 Ni 1-y Fe y O 4+ complex oxides (y=0.1-0.4) was synthesized via citric-nitric technique as described elsewhere [9]. The phase purity of the samples was confirmed by the XRPD analysis using Equinox 3000 (FWHM ∼ 0.05 ∘ at 2 ) instrument with Cu-K radiation at room temperature (RT The cathode materials were preliminary sonicated in ethanol media for ten minutes to reduce particle size and, thus, intensify a sintering process.…”

Section: Methodsmentioning

confidence: 99%