Synthesis and characterization of dense proton-conducting La1-xSrxScO3-α ceramics

Кузьмин, А. В.; Stroeva, А. Yu.; Горелов, В. П.; Novikova, Yu. V.; Lesnichyova, A.S.; Фарленков, А. С.; Khodimchuk, Anna V.

doi:10.1016/j.ijhydene.2018.11.041

Cited by 31 publications

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References 26 publications

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“…An EDX analysis of the cross sections of the LCS ceramics confirmed the non-uniform distribution of calcium in the LCS10 sample (Figure 3b). It is noteworthy that La 1−x Ca x ScO 3−α (x = 0.03–0.05) samples have uniform distribution of all elements, as well as La 1−x Sr x ScO 3−α (x = 0.05–0.1) [16]. According to the quantitative element analysis (Table 2), cations ratio in A and B sites corresponds to the sample’s nominal composition.…”

Section: Resultsmentioning

confidence: 99%

“…The La 0.97 Ca 0.03 ScO 3−α (LCS3), La 0.95 Ca 0.05 ScO 3−α (LCS5), La 0.9 Ca 0.1 ScO 3−α (LCS10) and La 0.9 Sr 0.1 ScO 3−α (LSS10) materials were prepared by the citric-nitrate combustion synthesis. The synthesis technique is given in detail in our previous work [16]. The stoichiometric amounts of La 2 O 3 , Sc 2 O 3 (both precursors from “Plant of rare metals”, Novosibirsk, Russia) CaCO 3 and SrCO 3 (from OJSC «Acron», Veliky Novgorod, Russia) with purity higher than 99.5% were mixed with consideration of the calcination coefficients and then dissolved in a solution containing the required amounts of nitric acid.…”

Section: Methodsmentioning

confidence: 99%

“…The transport properties of La 0.9 Sr 0.1 Sc 0.9 Mg 0.1 O 3−α [10,11]; LaSc 1−x Mg x O 3−α [12], La 1−x Sr x ScO 3−α [9,10,13,14,15,16] have been investigated in detail. Fujii et al [12] reported the conductivities of La 1−x Ca x ScO 3−α .…”

Section: Introductionmentioning

confidence: 99%

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Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides

et al. 2019

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In this study, oxide materials La1−xCaxScO3−α (x = 0.03, 0.05 and 0.10) were synthesized by the citric-nitrate combustion method. Single-phase solid solutions were obtained in the case of calcium content x = 0.03 and 0.05, whereas a calcium-enriched impurity phase was found at x = 0.10. Water uptake and release were studied by means of thermogravimetric analysis, thermodesorption spectroscopy and dilatometry. It was shown that lower calcium content in the main phase leads to a decrease in the water uptake. Conductivity was measured by four-probe direct current (DC) and two-probe ascension current (AC) methods at different temperatures, pO2 and pH2O. The effects of phase composition, microstructure and defect structure on electrical conductivity, as well as correlation between conductivity and water uptake experiments, were discussed. The contribution of ionic conductivity of La1−xCaxScO3−α rises with decreasing temperature and increasing humidity. The domination of proton conductivity at temperatures below 500 °C under oxidizing and reducing atmospheres is exhibited. Water uptake and release as well as transport properties of La1−xCaxScO3−α are compared with the properties of similar proton electrolytes, La1−xSrxScO3−α, and the possible reasons for their differences were discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides

et al. 2019

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“…Мостиковая модель была предложена нами для объяснения проводимости протонных электролитов La 1−x Sr x ScO 3−α [15].…”

Section: объемные и межзеренные проводимости Azsunclassified

Влияние влажности на электроперенос протонпроводящих перовскитов AZr-=SUB=-0.95-=/SUB=-Sc-=SUB=-0.05-=/SUB=-O-=SUB=-3-alpha-=/SUB=- (A=Ca, Sr, Ba) в окислительной атмосфере

Balakireva¹,

Горелов²,

Дунюшкина³

et al. 2019

Физика Твердого Тела

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The total, bulk, and grain boundary conductivities of proton-conducting zirconates of general formula AZr_0.95Sc_0.05O_3 – α (AZS), where A = Ca, Sr, Ba, are measured in air with different humidity levels. The conductivity is measured using the four-probe dc method (600–900°C) and impedance spectroscopy (30–800°C). The impact of humid atmosphere on the total, bulk, and grain boundary conductivities of the AZS system is studied at different humidity levels: $${{p}_{{{{{\text{H}}}_{{\text{2}}}}{\text{O}}}}}$$ = 0.04, 0.61, and 2.5 kPa. Humidity is found to have a considerable effect on the conductivity of our CaZS and BaZS at lower temperatures, suggesting the likelihood of hydronium ion-mediated transport.

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“…Some of these phases belong to the class of mixed ionic(protonic)-electronic conductors or MIECs [23][24][25][26]: Ln 6−х MoO 12−δ , Ln 2 ScTaO 7−δ , Ln 6 WO 12−δ . An additional series of primarily lanthanum-based materials can show predominant proton conductivity under certain conditions [27][28][29][30][31]: La 2 Zr 2 O 7 , LaNbO 4 , LaNb 3 O 9 , LaREO 3 (RE = Sc, Y, Yb). Among these, LaYO 3 and LaYbO 3 are positioned as promising proton-conducting electrolytes [32][33][34][35], having been successfully utilised in such electrochemical systems as hydrogen sensors and hydrogen pumps [36,37].…”

Section: Introductionmentioning

confidence: 99%

Densification, morphological and transport properties of functional La1–xBaxYbO3– ceramic materials

Kasyanova

Lyagaeva

Фарленков

et al. 2020

Journal of the European Ceramic Society

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The effective operation of protonic ceramic electrochemical cells requires the design of electrolytes having not only high ionic conductivity, but also excellent stability with respect to carbonisation. In the present work, the La-based oxides (La 1-x Ba x YbO 3-δ, 0.03 ≤ x ≤ 0.10) are proposed as a possible alternative to the convenient Ba (Ce,Zr)O 3-based electrolytes due to their high chemical stability. It was discovered that Ba-doping results in a deterioration of sintering behaviour; as a result, the relative density decreases and open porosity appears (for x = 0.10). A thorough analysis of transport properties by means of AC and DC measurement techniques enables a selection of the La 0.97 Ba 0.03 YbO 3-δ sample, which demonstrates the highest conductivity compared with those samples where x = 0.5 and 0.10. Due to its excellent densification behaviour, stability and ionic conductivity, La 0.97 Ba 0.03 YbO 3-δ can be considered as a promising proton-conducting electrolyte in the La-based family.

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Synthesis and characterization of dense proton-conducting La1-xSrxScO3-α ceramics

Cited by 31 publications

References 26 publications

Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides

Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides

Влияние влажности на электроперенос протонпроводящих перовскитов AZr-=SUB=-0.95-=/SUB=-Sc-=SUB=-0.05-=/SUB=-O-=SUB=-3-alpha-=/SUB=- (A=Ca, Sr, Ba) в окислительной атмосфере

Densification, morphological and transport properties of functional La1–xBaxYbO3– ceramic materials

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