Analysis of phase transition by variation of oxide ion content in BaFe0.9In0.1O3− as oxygen storage material using Mössbauer spectroscopy – Discovery of magnetic phase transition with cubic structure maintained

Fujishiro, Fumito; Izaki, Minako; Sasaoka, Chinatsu; Hashimoto, Takuya; Shozugawa, Katsumi; Matsuo, Motoyuki

doi:10.1016/j.matlet.2018.06.088

Cited by 5 publications

(6 citation statements)

References 13 publications

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“…In addition, HOLZ reflections were clearly observed in the CBED pattern of BFI010‐O 2 , as shown in Figure , suggesting that the Debye‐Waller factors for BFI010‐O 2 were smaller compared with those of BFI010‐N 2 at room temperature. This agrees with the smaller isotropic atomic displacement parameter, B , for BFI010‐O 2 compared with the parameter obtained for BFI010‐N 2 with a Rietveld analysis of the XRD patterns . The oxygen content, 3− δ , was estimated for the as‐prepared specimens via iodometry and was 2.76 and 2.47 for BFI010‐O 2 and BFI010‐N 2 , respectively; thus, it was concluded that the decrease in the amount of oxide ion vacancies, δ , also changed the crystal symmetry to a completely random arrangement of oxide ion vacancies.…”

Section: Resultssupporting

confidence: 83%

“…This agrees with the smaller isotropic atomic displacement parameter, B , for BFI010‐O 2 compared with the parameter obtained for BFI010‐N 2 with a Rietveld analysis of the XRD patterns . The oxygen content, 3− δ , was estimated for the as‐prepared specimens via iodometry and was 2.76 and 2.47 for BFI010‐O 2 and BFI010‐N 2 , respectively; thus, it was concluded that the decrease in the amount of oxide ion vacancies, δ , also changed the crystal symmetry to a completely random arrangement of oxide ion vacancies. These results also indicate that differences in the In content could change the amount of oxide ion vacancies due to the charge neutrality because the In valence was lower than the Fe valence for specimens that were heated in O 2 .…”

Section: Resultssupporting

confidence: 83%

“…BaCO 3 , Fe(NO 3 ) 3 ∙9H 2 O, and In 2 O 3 were used as starting materials. Our previous studies discuss the procedures used in this study in detail . Heating in N 2 (BFI010‐N 2 ) or O 2 (BFI010‐O 2 ) at 1200°C yielded BaFe 0.9 In 0.1 O 3− δ .…”

Section: Methodsmentioning

confidence: 99%

“…However, it could not be concluded that the oxide ion vacancy arrangement was completely random in all cubic perovskite phases. Although X‐ray diffraction patterns for BaFe 0.9 In 0.1 O 3− δ , which were prepared in both N 2 and O 2 and measured at room temperature, were indexed to cubic perovskite structures, the full width at half maximum (FWHM) of the XRD peaks for the specimen prepared in N 2 (BFI010‐N 2 ) was larger than that for the specimen prepared in O 2 (BFI010‐O 2 ). The difference in the FWHM was due to the extraordinarily large isotropic atomic displacement parameters, which were obtained by Rietveld analysis of the BFI010‐N 2 .…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the arrangement of oxide ion vacancies and their effect on the crystal structure of BaFe_0.9In_0.1O₃₋_δ

et al. 2019

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The crystal structure of BaFe0.9In0.1O3−δ, which was prepared via heating in N2 (BFI010‐N2), was evaluated using high‐temperature X‐ray diffraction (XRD) and in situ convergent‐beam electron diffraction (CBED) at room temperature and 700°C. Although the crystal structure of BFI010‐N2 at room temperature was assigned to a cubic perovskite‐type structure based on the XRD results, the CBED patterns indicated that the space group of its crystal structure was not Pm3¯m (No. 221), which corresponds to an ideal cubic perovskite. When the temperature was increased to 700°C, the symmetries for the space group of cubic perovskite were directly observed by means of in situ CBED, indicating that the partial ordering and/or clustering of oxide ion vacancies in the BFI010‐N2 vanished and that the oxide ion vacancy arrangements became completely random. The change in crystal symmetry agreed with a sudden decrease in the activation energy of oxide ion conduction at 600°C. The crystal symmetry of the BaFe0.9In0.1O3−δ sample that was prepared via heating in O2 (BFI010‐O2) and had a decreased δ value was compared with that of the BFI010‐N2 sample. It was concluded that the same phase transition also occurred by a decrease in δ, similar to phase transitions caused by increasing the temperature.

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Section: Resultssupporting

confidence: 83%

Section: Resultssupporting

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of the arrangement of oxide ion vacancies and their effect on the crystal structure of BaFe_0.9In_0.1O₃₋_δ

et al. 2019

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“…The detailed Mossbauer spectroscopy procedure is described in the literature. 16 The average valence of the B-site ions was determined by using iodometry.…”

Section: Experimental Methodsmentioning

confidence: 99%

B-Site Mixing Effect on the Redox Reaction of Mn Ions in Perovskite-Type SrFe_1–xMn_xO_3−δ

Fujishiro,

Oishi,

Hashimoto

et al. 2023

J. Phys. Chem. C

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The reduction behavior of Fe and Mn ions and the changes in metal−oxygen polyhedra in cubic perovskite-type SrFe 1−x Mn x O 3−δ (SFM) induced by heating under N 2 flow were investigated with X-ray diffraction, X-ray absorption fine structure spectroscopy, and Mossbauer spectroscopy. Both the Mn and Fe valences decreased, and metal−oxygen polyhedra in the asprepared SFM samples with 0.1 ≤ x ≤ 0.4 varied with N 2 heating, showing agreement with reported thermodynamic predictions. The valence state and local atomic structure of Mn ions with sixfold coordination in MnO 6 octahedra in SrFe 0.5 Mn 0.5 O 3−δ and SrFe 0.4 Mn 0.6 O 3−δ were retained upon N 2 heating. The results indicate that the reduction of Fe ions and the flexibility of Fe−O polyhedra in the perovskite-type structure can accommodate the distortion due to oxygen desorption, suppressing the reduction of Mn 4+ for the SFM samples with x = 0.5 and 0.6. Understanding the different reduction behaviors of Mn ions is essential for the design of new oxygen storage materials.

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Relationship among the local structure, chemical state of Fe ions in Fe-O polyhedra, and electrical conductivity of cubic perovskite Ba1−Sr Fe0.9In0.1O3−δ with varying number of oxide ion vacancies

Fujishiro

Sasaoka

Oishi

et al. 2021

Materials Research Bulletin

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Analysis of phase transition by variation of oxide ion content in BaFe0.9In0.1O3− as oxygen storage material using Mössbauer spectroscopy – Discovery of magnetic phase transition with cubic structure maintained

Cited by 5 publications

References 13 publications

Investigation of the arrangement of oxide ion vacancies and their effect on the crystal structure of BaFe_0.9In_0.1O₃₋_δ

Investigation of the arrangement of oxide ion vacancies and their effect on the crystal structure of BaFe_0.9In_0.1O₃₋_δ

B-Site Mixing Effect on the Redox Reaction of Mn Ions in Perovskite-Type SrFe_1–xMn_xO_3−δ

Relationship among the local structure, chemical state of Fe ions in Fe-O polyhedra, and electrical conductivity of cubic perovskite Ba1−Sr Fe0.9In0.1O3−δ with varying number of oxide ion vacancies

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Analysis of phase transition by variation of oxide ion content in BaFe0.9In0.1O3− as oxygen storage material using Mössbauer spectroscopy – Discovery of magnetic phase transition with cubic structure maintained

Cited by 5 publications

References 13 publications

Investigation of the arrangement of oxide ion vacancies and their effect on the crystal structure of BaFe0.9In0.1O3−δ

Investigation of the arrangement of oxide ion vacancies and their effect on the crystal structure of BaFe0.9In0.1O3−δ

B-Site Mixing Effect on the Redox Reaction of Mn Ions in Perovskite-Type SrFe1–xMnxO3−δ

Relationship among the local structure, chemical state of Fe ions in Fe-O polyhedra, and electrical conductivity of cubic perovskite Ba1−Sr Fe0.9In0.1O3−δ with varying number of oxide ion vacancies

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Investigation of the arrangement of oxide ion vacancies and their effect on the crystal structure of BaFe_0.9In_0.1O₃₋_δ

Investigation of the arrangement of oxide ion vacancies and their effect on the crystal structure of BaFe_0.9In_0.1O₃₋_δ

B-Site Mixing Effect on the Redox Reaction of Mn Ions in Perovskite-Type SrFe_1–xMn_xO_3−δ