Ionic conductivity and thermal expansion of anion-deficient Sr11Mo4O23 perovskite

Хартон, В.В.; Tsipis, E.V.; Kolotygin, V.A.; Avdeev, Maxim; Kennedy, Brendan J.

doi:10.1007/s10008-020-04688-x

Cited by 2 publications

(10 citation statements)

References 24 publications

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“…In a detailed analysis, it is possible to observe subtle changes with the atmospheric conditions that could be explained in terms of high oxygen-ion conduction and a low protonic conduction component below to 400 C. These facts are in agreement with the thermochemical behaviour of the sample shown above from TGA-MS data. Kharton et al also reported this atmosphere conductivity dependence, 21 but in the present work the changes were more insignicant, most likely due to a superior stability of SMO14 to humid atmospheres.…”

Section: Conductivity Measurementssupporting

confidence: 42%

“…In addition, the absence of changes in the O 2 c + fragment would allow discarding or considering negligible the loss/uptake of O 2 , as proposed in previous works. 14,21 On the other hand, the rst cycle in air (Fig. 6c) of SMO14 shows a prole resembling that of SMO11, but it is less intense considering the weight changes.…”

Section: Thermogravimetric Analysis-mass Spectrometry (Tga-ms)mentioning

confidence: 92%

“…5 for both air and helium runs. This reversible process has been explained by proposing the removal and uptake of O 2 , H 2 O or CO 2 ; 14,17,19,21 however, these works contain no conclusive evidences to conrm or discard any of them. The thermal evolution of fragment signals from mass spectroscopy is shown in Fig.…”

Section: Thermogravimetric Analysis-mass Spectrometry (Tga-ms)mentioning

confidence: 99%

“…6d also shows that there is no evidence of reversible loss and uptake of O 2 and/or CO 2 , as proposed previously. 14,21…”

Section: Thermogravimetric Analysis-mass Spectrometry (Tga-ms)mentioning

confidence: 99%

“…20 In addition, in a recent work, Kharton et al studied the ionic conductivity and also observed the mass changes with temperature. 21 So far, the physicochemical reasons behind these changes remain unknown. Considering these facts, this work presents the study of two phases of Sr 11 Mo 4 O 23 obtained at 1100 and 1400 C, using synchrotron X-ray diffraction to analyze the structural differences between them; the results from thermogravimetric analysis coupled with mass spectroscopy helped us to unveil the chemical changes occurring at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis conditions impact on Sr₁₁Mo₄O₂₃ electroceramic: crystal structure, stability and transport properties

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Section: Conductivity Measurementssupporting

confidence: 42%

Section: Thermogravimetric Analysis-mass Spectrometry (Tga-ms)mentioning

confidence: 92%

Section: Thermogravimetric Analysis-mass Spectrometry (Tga-ms)mentioning

confidence: 99%

“…6d also shows that there is no evidence of reversible loss and uptake of O 2 and/or CO 2 , as proposed previously. 14,21…”

Section: Thermogravimetric Analysis-mass Spectrometry (Tga-ms)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis conditions impact on Sr₁₁Mo₄O₂₃ electroceramic: crystal structure, stability and transport properties

et al. 2021

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Improved Oxide Ion Conductivity of Hexagonal Perovskite-Related Oxides Ba3W1+xV1−xO8.5+x/2

et al. 2023

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Hexagonal perovskite-related oxides such as Ba3WVO8.5 have attracted much attention due to their unique crystal structures and significant oxide ion conduction. However, the oxide ion conductivity of Ba3WVO8.5 is not very high. Herein, we report new hexagonal perovskite-related oxides Ba3W1+xV1−xO8.5+x/2 (x = −0.1, −0.05, 0.05, 0.1, 0.25, 0.4, 0.5, 0.6, and 0.75). The bulk conductivity of Ba3W1.6V0.4O8.8 was found to be 21 times higher than that of the mother material Ba3WVO8.5 at 500 °C. Maximum entropy method (MEM) neutron scattering length density (NSLD) analyses of neutron diffraction data at 800 °C experimentally visualized the oxide ion diffusion pathways through the octahedral O2 and tetrahedral O3 sites in intrinsically oxygen-deficient layers. By increasing the excess W content x in Ba3W1+xV1−xO8.5+x/2, the excess oxygen content x/2 increases, which leads to more oxygen atoms at the O2 and O3 oxygen sites, a higher minimum NSLD on the O2–O3 path, and a higher level of conductivity. Another reason for the increased conductivity of Ba3W1.6V0.4O8.8 is the lower activation energy for oxide ion conduction, which can be ascribed to the longer (W/V)–O2 and (W/V)–O3 distances due to the substitution of V atoms with large-sized W species. The present findings open new avenues in the science and technology of oxide ion conductors.

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Ionic conductivity and thermal expansion of anion-deficient Sr11Mo4O23 perovskite

Cited by 2 publications

References 24 publications

Synthesis conditions impact on Sr₁₁Mo₄O₂₃ electroceramic: crystal structure, stability and transport properties

Synthesis conditions impact on Sr₁₁Mo₄O₂₃ electroceramic: crystal structure, stability and transport properties

Improved Oxide Ion Conductivity of Hexagonal Perovskite-Related Oxides Ba3W1+xV1−xO8.5+x/2

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Ionic conductivity and thermal expansion of anion-deficient Sr11Mo4O23 perovskite

Cited by 2 publications

References 24 publications

Synthesis conditions impact on Sr11Mo4O23 electroceramic: crystal structure, stability and transport properties

Synthesis conditions impact on Sr11Mo4O23 electroceramic: crystal structure, stability and transport properties

Improved Oxide Ion Conductivity of Hexagonal Perovskite-Related Oxides Ba3W1+xV1−xO8.5+x/2

Contact Info

Product

Resources

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Synthesis conditions impact on Sr₁₁Mo₄O₂₃ electroceramic: crystal structure, stability and transport properties

Synthesis conditions impact on Sr₁₁Mo₄O₂₃ electroceramic: crystal structure, stability and transport properties