Structural and thermal evolution studies of LaSbO4 ceramics prepared by solid-state reaction method

Siqueira, Kisla Prislen Félix; Borges, Raquel Moreira; Soares, Júlia Cristina; Dias, Anderson

doi:10.1016/j.matchemphys.2013.03.031

Cited by 10 publications

(18 citation statements)

References 25 publications

(26 reference statements)

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“…2). The intensity of 18 O is much higher at certain parts of the sample, possibly the grain boundary region(s), than in the surrounding areas. In the meantime, the 16 O signal is systematically lowered in these parts, which suggests a fast diffusion pathway for oxygen migration that confirms the model employed in the diffusion profile fitting.…”

Section: Resultsmentioning

confidence: 95%

“…9 is the diffusion profile of LNSO30 sample, which has been exchanged at 800 °C for 1056 s. The concentration of the 18 O tracer near the surface drops sharply, and then decreases slowly, leading to a "tail" in the diffusion profile. Initial fitting using the Crank solution for the semi-infinite planar diffusion (6) leads to an underestimate of the tracer concentration after the initial stage of the profile (shown in figure).…”

Section: Resultsmentioning

confidence: 99%

“…where ( Secondary ion images of the samples reveal a distribution of 18 O within the sample (cf. SI Fig.…”

Section: Resultsmentioning

confidence: 99%

“…For the LNSO30 samples, 18 O tracer isotopic exchange was conducted to determine the oxygen contribution to the total conduction. The sintered samples were first ground with SiC paper and then polished with successive grades of diamond spray to ¼ μm finish.…”

Section: Methodsmentioning

confidence: 99%

“…lanthanide vanadates, niobates, arsenates or antimonates) possess interesting functional properties, such as ferroelasticity [12][13][14] , photoluminescence [15][16][17][18][19][20] or ionic conductivity [21][22][23] . Out of this group lanthanum orthoniobate is considered to be among the best materials combining appreciable proton conductivity and chemical stability 22,[24][25][26][27] , reaching conductivity close to 10 -3 S/cm at 900 °C under wet conditions 22 .…”

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confidence: 99%

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Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

et al. 2016

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The results of ionic transport measurements for the lanthanum orthoniobate substituted with 10 and 30 mol% of antimony (LaNb0.9Sb0.1O4 and LaNb0.7Sb0.3O4) are presented and discussed. The influence of calcium co-doping on these properties has also been analysed. It has been shown that for the investigated material protonic conductivity predominates at temperatures up to 800 °C in oxidizing atmospheres, in wet conditions. Maximum observed protonic conductivity reaches ~10-4 S/cm at 800 °C (in humidified air); in the dry conditions the increasing influence of oxygen vacancies and holes is detected. Oxygen self-diffusivity has also been analysed by isotopic exchange to investigate the possible diffusion paths.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

“…where ( Secondary ion images of the samples reveal a distribution of 18 O within the sample (cf. SI Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

et al. 2016

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High‐Temperature Proton Conduction in LaSbO₄

Winiarz

Dzierzgowski

Mielewczyk‐Gryń

et al. 2021

Chemistry A European J

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Lanthanum orthoantimonate was synthesized using as olid-state synthesis method.T oe nhancet he possible protonic conductivity,s amples with the addition of 1mol %C ai nL a-site were also prepared. The structure was studied by the meanso fX-ray diffraction, which showedt hat both specimens weres ingle phase. The materials crystallized in the space group P2 1 /n. Dilatometry revealedt hat the materiale xpanded non-linearly with the temperature. The nature of this deviation is unknown; however,t he calculated linearf raction thermal expansion coefficient was 9.56 10 À6 K À1 .E lectrical properties studies showedt hat the material is ap rotonc onductor in oxidizing conditions, which was confirmed both by temperature studiesi nw et in dry air,b ut also by the H/D isotopee xchangee xperiment. The conductivity was rather modest, peakinga tt he order of 10 À6 Scm À1 at 800 8C, but this could be further improved by microstructure and doping optimization.T his is the first time protonic conductivity in lanthanum orthoantimonates is reported. Proton conducting ceramics (PCCs) are materials exhibiting ionic conductivityi nw hichp roton (H +)i sacharge carrier. [1] This class of materials has gathered interest over the years for their potential applications.E specially the so-called triple conductingo xides, that is, materials with three mobile charge carriers (protons, oxygen ions, and electron/electron holes) were discovered and studied as potential electrode materials. [2-5] The increased interest led to developing highly-efficient fuel cells [5-7] and steam electrolyzers. [8] This interest stems from the fact that PCC-based devices can operate with high efficiencies while being cost-competitive in comparison to traditional solid oxide fuel cells. [5, 9] Apart from that, new typeso fe lectrochemical devices have been developed. Such devicesc an be used for the synthesis of ammonia, [10, 11] conversion of methane into aromaticsi namembraner eactor, [12] or thermo-electrochemical production of hydrogen from methane. [13]

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Influence of antimony substitution on spontaneous strain and thermodynamic stability of lanthanum orthoniobate

Mielewczyk‐Gryń

Wachowski

Lilova

et al. 2015

Ceramics International

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Structural and thermal evolution studies of LaSbO4 ceramics prepared by solid-state reaction method

Abstract: h i g h l i g h t s LaSbO 4 compounds were produced by solid-state method. Structural characterization was conducted by XRD and Raman scattering. Polarized Raman spectroscopy in sintered ceramics allowed us a complete modes assignment. Luminescence properties revealed a promising phosphor.

Cited by 10 publications

References 25 publications

Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

High‐Temperature Proton Conduction in LaSbO₄

Influence of antimony substitution on spontaneous strain and thermodynamic stability of lanthanum orthoniobate

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Structural and thermal evolution studies of LaSbO4 ceramics prepared by solid-state reaction method

Cited by 10 publications

References 25 publications

Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

High‐Temperature Proton Conduction in LaSbO4

Influence of antimony substitution on spontaneous strain and thermodynamic stability of lanthanum orthoniobate

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Product

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High‐Temperature Proton Conduction in LaSbO₄