Effect of substitution of magnetic rare earth Nd at non-magnetic La site on structure and properties of LaSrFeO4

Singh, Devinder; Singh, Suram; Mahajan, Arun; Choudhary, Nisha

doi:10.1016/j.ceramint.2013.07.003

Cited by 17 publications

(7 citation statements)

References 10 publications

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“…According to Shannon's ionic radii (rLa 3+ = 1.216 Å, rSr 2+ = 1.31 Å, rNi 3+ = 0.56 Å, and rO 2− = 1.40 Å), the calculated tolerance factors lie in the tetragonal symmetry stability interval, confirming the tetragonal symmetry of the investigated phases. Similar results were also reported in Nd-modified La 2−x Nd x SrFeO 4 (Singhn et al, 2014). The stable La 2−x Sr x NiO 4 nickelate displays a quasitwo-dimensional structure in perovskite blocks, whose one rock salt-type (La-Sr/O) layer is sandwiched by one-octahedra-thick layer along the c axis.…”

Section: Methodssupporting

confidence: 84%

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

Sheng

et al. 2020

Front. Mater.

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This work aims to achieve the excellent microwave absorption in layered dielectric nickelate compounds. The phase, microstructure, electromagnetic properties, and microwave absorption of the Sr-modified La 2−x Sr x NiO 4±δ (x = 0, 0.3, 0.5, 0.75) nickelates were investigated, determining and analyzing the role of Sr doping level. All compounds reveal the single tetragonal phase identified as the I4/mmm space group, and the lattice parameters correlate with the doping content, evidenced by Rietveld refinement. By introducing strontium, the pronouncedly increased electronic conductivity contributes to the high dielectric loss, which gives rise to a superior attenuation ability and absorbing bandwidth. A minimum reflection loss of-21.07 dB was found in La 2−x Sr x NiO 4±δ (x = 0.75) at a thickness of 1.9 mm, covering the effective bandwidth of 2.9 GHz. This enhanced microwave absorbing performance in nickelate shows promise in the radar absorbing field.

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Section: Methodssupporting

confidence: 84%

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

Sheng

et al. 2020

Front. Mater.

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“…SrLaFeO 4 has been previously studied for its magnetic properties [24] and as an anode for solid oxide fuel cells [19] . In addition, changes to its electrical and magnetic properties due to A‐site substitution have been examined before [25–26] . Similarly, the magnetic properties of SrLaCo 0.5 Fe 0.5 O 4 , [27] as well as electrical, thermal and magnetic behavior of SrLaCoO 4 , [8,28–29] and its application in CO and C 3 H 8 oxidation have been studied [30] .…”

Section: Introductionmentioning

confidence: 99%

Layered Oxides SrLaFe_1‐xCo_xO_4‐δ (x=0–1) as Bifunctional Electrocatalysts for Water‐Splitting

Alom

Ramezanipour

2021

ChemCatChem

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Multifunctional materials that are capable of facilitating multiple electrocatalytic processes are highly desirable. This work reports the observation of bifunctional electrocatalytic properties for water‐splitting in layered oxides, featuring 2‐dimensional layers of octahedrally coordinated transition metals separated by alkaline‐earth or rare‐earth metals. Remarkably, these materials are able to catalyze both half‐reactions of water‐splitting, i. e., oxygen‐evolution reaction (OER) and hydrogen‐evolution reaction (HER). Electrical charge‐transport studies of SrLaFe1‐xCoxO4‐δ in a wide range of temperatures, 25 to 800 °C, indicate semiconducting behavior for all three compounds, where there is a systematic increase in electrical conductivity as a function of temperature. The end member of the series, SrLaCoO4‐δ, exhibits the highest electrical charge transport and best electrocatalytic activity toward both OER and HER. This catalyst also features the highest degree of polyhedral distortion as well as the presence of oxygen‐vacancies. In addition, the transition metals in this material have a favorable electronic configuration for enhanced electrocatalytic activity.

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“…In the case of oxygen deficiency, Fe 2+ /Fe 3+ pairs appear in ceramics, generating electrons and n-type conductivity. From Table 3, it is evident that the electrical resistivity ρDC of the obtained samples is higher than in the above-mentioned works [27][28][29][30]. This is due to the presence of a phase with high electrical resistance.…”

Section: Resultsmentioning

confidence: 71%

Properties of Perovskite-like Lanthanum Strontium Ferrite Ceramics with Variation in Lanthanum Concentration

et al. 2022

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The purpose of this work is to study the effect of lanthanum (La) concentration on the phase formation, conductivity, and thermophysical properties of perovskite-like strontium ferrite ceramics. At the same time, the key difference from similar studies is the study of the possibility of obtaining two-phase composite ceramics, the presence of various phases in which will lead to a change in the structural, strength, and conductive properties. To obtain two-phase composite ceramics by mechanochemical solid-phase synthesis, the method of the component molar ratio variation was used, which, when mixed, makes it possible to obtain a different ratio of elements and, as a result, to vary the phase composition of the ceramics. Scanning electron microscopy, X-ray phase analysis, and impedance spectroscopy were used as research methods, the combination of which made it possible to comprehensively study the properties of the synthesized ceramics. Analysis of phase changes depending on lanthanum concentration change can be written as follows: (La0.3Sr0.7)2FeO4/LaSr2Fe3O8 → (La0.3Sr0.7)2FeO4/LaSr2Fe3O8/Sr2Fe2O5 → (La0.3Sr0.7)2FeO4/Sr2Fe2O5. Results of impedance spectroscopy showed that with an increase in lanthanum concentration from 0.10 to 0.25 mol in the synthesized ceramics, the value of the dielectric permittivity increases significantly from 40.72 to 231.69, the dielectric loss tangent increases from 1.07 to 1.29 at a frequency of 10,000 Hz, and electrical resistivity decreases from 1.29 × 108 to 2.37 × 107 Ω∙cm.

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Effect of substitution of magnetic rare earth Nd at non-magnetic La site on structure and properties of LaSrFeO4

Cited by 17 publications

References 10 publications

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

Layered Oxides SrLaFe_1‐xCo_xO_4‐δ (x=0–1) as Bifunctional Electrocatalysts for Water‐Splitting

Properties of Perovskite-like Lanthanum Strontium Ferrite Ceramics with Variation in Lanthanum Concentration

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Effect of substitution of magnetic rare earth Nd at non-magnetic La site on structure and properties of LaSrFeO4

Cited by 17 publications

References 10 publications

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

Layered Oxides SrLaFe1‐xCoxO4‐δ (x=0–1) as Bifunctional Electrocatalysts for Water‐Splitting

Properties of Perovskite-like Lanthanum Strontium Ferrite Ceramics with Variation in Lanthanum Concentration

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Layered Oxides SrLaFe_1‐xCo_xO_4‐δ (x=0–1) as Bifunctional Electrocatalysts for Water‐Splitting