Tailoring structural properties of lanthanum orthoniobates through an isovalent substitution on the Nb-site

Wachowski, Sebastian; Kamecki, Bartosz; Winiarz, Piotr; Dzierzgowski, Kacper; Mielewczyk‐Gryń, Aleksandra; Gazda, Maria

doi:10.1039/c8qi00524a

Cited by 27 publications

(42 citation statements)

References 47 publications

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“… X‐ray diffractograms of LaNb 1‐x As x O 4 with different As content synthesized by methods (a) II and (b) III (data from).…”

Section: Resultsmentioning

confidence: 97%

“…The plots showing the structural properties of compounds synthesized with this method (cf. Figure b and 5 b) have been redrawn on the basis of previously published data . It has been done in order to compare the results of the different approaches.…”

Section: Resultsmentioning

confidence: 99%

“…Figure shows the unit cell parameters of materials synthesized with routes II [this study] and III . The changes induced by As substitution are very much alike.…”

Section: Resultsmentioning

confidence: 99%

“…Thus it seems worthy to check the possibility of solid state synthesis of LaNb 1‐x As x O. Moreover, the combined method of co‐precipitation and solid state reaction used in our previous work calls out for a further exploration in which process can be for instance further simplified by reducing the number of steps in the synthesis.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work, we studied the structural properties of LaNb 1-x As x O 4 synthesized by a method combining wet chemistry and solid state synthesis. [40] However, since the method requires multiple steps including co-precipitation and two solid state reaction processes it seems important to explore the possibility of alternative synthesis methods. Shifting approach to full wet chemical synthesis is limited by the fact that solubility regimes for La-based and Nb-based chemicals are completely different.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and Structural Properties of LaNb_1‐xAs_xO₄ Ceramics

et al. 2019

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Lanthanum niobate substituted with arsenic was synthesized by three methods: solid state reaction from binary oxides and two different methods combining co‐precipitation and solid‐state reaction. In the first of the combined methods LaNb1‐xAsxO4 was synthesized from LaAsO4, obtained from co‐precipitation method, and lanthanum and niobium oxides. In the second LaNbO4 was first synthesized from binary oxides and then mixed with LaAsO4 and fired in the second step to obtain the final material. Single phase materials could not be synthesized via solid‐state synthesis, whilst it was possible with both of the combined methods. Structural parameters of the materials obtained with both methods were similar what shows that they do not relate to the synthesis method. Ceramics obtained with both combined methods were dense, however, the density of the ceramics formed from LaAsO4 and LaNbO4 was higher.

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“… X‐ray diffractograms of LaNb 1‐x As x O 4 with different As content synthesized by methods (a) II and (b) III (data from).…”

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

“…Figure shows the unit cell parameters of materials synthesized with routes II [this study] and III . The changes induced by As substitution are very much alike.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication and Structural Properties of LaNb_1‐xAs_xO₄ Ceramics

et al. 2019

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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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Key Parameters of Proton‐conducting Solid Oxide Fuel Cells from the Perspective of Coherence with Models

et al. 2020

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The paper presents a review of thermal, flow, and material parameters from the perspective of modeling proton‐conducting solid oxide fuel cells (H+SOFC). Comments are offered regarding key parameters selected through research of the literature, featuring mostly material‐related properties of electrolyte and electrodes. Some general relationships are proposed here for the purpose of modeling H+SOFC. The most important parameter is fuel cell operational temperature. Next to the temperature, partial pressures of hydrogen on both sides of H+SOFC impact mainly maximum voltage. The materials from which the fuel cell is built do not directly affect the operation of the fuel cell in the sense that they can be taken as fixed values. Indirectly, their influence can be seen in the resistances, that electrolyte conducts for proton flux and electrodes for electrons. In some cases, double ion/electron conductivity may occur.

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Tailoring structural properties of lanthanum orthoniobates through an isovalent substitution on the Nb-site

Abstract: The structure and thermomechanical properties of As-substituted lanthanum orthoniobates are presented and an in-depth analysis of a broad range of other substituents is performed.

Cited by 27 publications

References 47 publications

Fabrication and Structural Properties of LaNb_1‐xAs_xO₄ Ceramics

Fabrication and Structural Properties of LaNb_1‐xAs_xO₄ Ceramics

High‐Temperature Proton Conduction in LaSbO₄

Key Parameters of Proton‐conducting Solid Oxide Fuel Cells from the Perspective of Coherence with Models

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Tailoring structural properties of lanthanum orthoniobates through an isovalent substitution on the Nb-site

Abstract: The structure and thermomechanical properties of As-substituted lanthanum orthoniobates are presented and an in-depth analysis of a broad range of other substituents is performed.

Cited by 27 publications

References 47 publications

Fabrication and Structural Properties of LaNb1‐xAsxO4 Ceramics

Fabrication and Structural Properties of LaNb1‐xAsxO4 Ceramics

High‐Temperature Proton Conduction in LaSbO4

Key Parameters of Proton‐conducting Solid Oxide Fuel Cells from the Perspective of Coherence with Models

Contact Info

Product

Resources

About

Fabrication and Structural Properties of LaNb_1‐xAs_xO₄ Ceramics

Fabrication and Structural Properties of LaNb_1‐xAs_xO₄ Ceramics

High‐Temperature Proton Conduction in LaSbO₄