Processing, structure, microstructure, and transport properties of the oxygen-conducting ceramics (La,Sr)(Ga,M)O y (M=Mg, Fe, Ni)

Политова, Е. Д.; Stefanovich, S. Yu.; Avetisov, A. K.; Aleksandrovskii, V. V.; Glavatskih, T. Yu.; Голубко, Н. В.; Калева, Г. М.; Мосунов, А. В.; Венсковский, Н. У.

doi:10.1007/s10008-003-0490-9

Cited by 22 publications

(12 citation statements)

References 18 publications

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“…The total conductivity increases with increasing dopant concentration, which corresponds to a change in the dominating type of conductivity from almost the pure ionic one to the mixed oxide ion electron one. At low and high temperatures, the contribution of the electronic constituent of conductivity increases with increasing x (Ref 17,18). The mechanism of electronic transport is most likely to be hopping of p-type charge carriers between relatively isolated transition metal cations ( Ref 19,20).…”

Section: Electrical Conductivitymentioning

confidence: 98%

A Limiting Current Oxygen Sensor Based on LSGM as a Solid Electrolyte and LSGMN (N = Fe, Co) as a Dense Diffusion Barrier

Liu

Gao

et al. 2016

J. of Materi Eng and Perform

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The La 0.8 Sr 0.2 (Ga 12x Co x ) 0.8 Mg 0.2 O 32d (LSGMC x = 0.05, 0.1, 0.15, 0.2, 0.25) and La 0.8 Sr 0.2 (Ga 12x Fe x ) 0.8 Mg 0.2 O 32d (LSGMF x = 0.1, 0.2, 0.3) samples were prepared by solid-state reaction. The structure, conductivity, thermal expansion behavior, and chemical compatibility were studied by XRD, dilatometry, and four-terminal method. A limiting current oxygen sensor was prepared with La 0.8 Sr 0.2 Ga 0.83 Mg 0.17 O 2.815 as a solid electrolyte and La 0.8 Sr 0.2 (Ga 0.75 Co 0.25 ) 0.8 Mg 0.2 O 32d as a dense diffusion barrier. The oxygen-sensitive characteristic was measured at different oxygen concentrations. The results show that the phase structure of samples is cubic, except La 0.8 Sr 0.2 (Ga 0.75 Co 0.25 ) 0.8 Mg 0.2 O 32d , which has a hexagonal structure. The change in activation energy for electrical conductivity and the increase in thermal expansion coefficient are confirmed to correlate with an increasing concentration of oxygen vacancies. The limiting current oxygen sensor exhibits a good limiting current platform and the limiting current depends linearly on the oxygen concentration: I L (mA) = 12.8519 + 2.2667 x O2 (mol%, 0 < x O2 < 3.31) at 750°C, I L (mA) = 14.3222 + 3.5180 x O2 (mol%, 0 < x O2 < 4.16) at 800°C, and I L (mA) = 15.2872 + 5.0269 x O2 (mol%, 0 < x O2 < 4.12) at 850°C. The sensor has the best sensitivity at 850°C. As the oxygen concentration increases, the interface resistance of the sensor decreases at 850°C.

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Section: Electrical Conductivitymentioning

confidence: 98%

A Limiting Current Oxygen Sensor Based on LSGM as a Solid Electrolyte and LSGMN (N = Fe, Co) as a Dense Diffusion Barrier

Liu

Gao

et al. 2016

J. of Materi Eng and Perform

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“…Its magnitude is proportional to the number of oxygen vacancies. Relatively small deviation was observed for the composition with x=0÷0.15 but it increased gradually along with the increasing Fe and Ni content up to x≈0.25÷0.45 [18]. So, the dilatometry data point on much larger oxygen loss in the samples with x≥0.25.…”

Section: Resultsmentioning

confidence: 63%

“…1). In the Ni-containing samples rhombohedral perovskite phase was formed only in compositions with x<0.4 [18]. The perovskite lattice contraction was observed when iron or nickel substituted for gallium up to about 20 or 40 at %, respectively (Fig.…”

Section: Resultsmentioning

confidence: 86%

“…Strong deviation from the linear expansion law was observed at temperatures higher than 400 o C [18]. It is known that this deviation is tightly connected with the oxygen content change with temperature increasing.…”

Section: Resultsmentioning

confidence: 94%

“…On the other hand, high ionic conductivity and high chemical stability in reducing atmosphere were revealed in the lanthanum gallate -based oxides [9,10]. This stimulated further investigations of LaGaO 3 -based oxides as the leading materials for application in the solid oxide fuel cell (SOFC) and methane conversion technologies [11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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The lanthanum gallate‐based mixed conducting perovskite ceramics

Политова

Stefanovich

Aleksandrovskii

et al. 2005

phys. stat. sol. (c)

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PACS 66.30.Dn, 72.60.+g The structure, microstructure, dielectric, and transport properties of the anion deficient perovskite solid solutions (La,Sr)(Ga,Mg,M)O 3-δ with M=Fe, Ni have been studied. Substitution of iron and nickel for gallium up to about 20 and 40 at.% respectively, leads to the perovskite lattice contraction due to the cation substitutions by the transition elements. The transition from pure ionic to mixed ionic-electronic conductivity was observed for both the systems studied. Both the enhancement of total conductivity and increasing in the thermal expansion coefficient values has been proved to correlate with the increasing amount of weakly bounded oxygen species in the Fe or Ni-doped ceramics. The oxygen ionic conductivity has been estimated from the kinetic experiments using the dc-conductivity and dilatometry methods under the condition of the stepwise change of the atmosphere from nitrogen to oxygen.

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Oxygen ionic and mixed conductors: recent developments

Хартон

Scholz

2006

J Solid State Electrochem

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Processing, structure, microstructure, and transport properties of the oxygen-conducting ceramics (La,Sr)(Ga,M)O y (M=Mg, Fe, Ni)

Cited by 22 publications

References 18 publications

A Limiting Current Oxygen Sensor Based on LSGM as a Solid Electrolyte and LSGMN (N = Fe, Co) as a Dense Diffusion Barrier

A Limiting Current Oxygen Sensor Based on LSGM as a Solid Electrolyte and LSGMN (N = Fe, Co) as a Dense Diffusion Barrier

The lanthanum gallate‐based mixed conducting perovskite ceramics

Oxygen ionic and mixed conductors: recent developments

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