Oxygen stoichiometry in the (Ba0.5La0.5) (Fe1-xCux)O3-w (x=0-1) perovskite system

K. Lehmus; M. Karppinen; M. Matvejeff; J. Lindén; T. Pietari; H. Yamauchi

doi:10.1016/S1466-6049(01)00177-5

Oxygen stoichiometry in the (Ba_0.5La_0.5) (Fe_1-xCu_x)O_3-w (x=0-1) perovskite system

K. Lehmus
, M. Karppinen^*
, M. Matvejeff
, J. Lindén
, T. Pietari
, H. Yamauchi

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

3 Citations (Scopus)

Abstract

Oxygen stoichiometry in the perovskite system (Ba_0.5La_0.5) (Fe_1-xCu_x)O_3-w with x varying in the range of 0 to 1 was studied by thermogravimetry, ⁵⁷Fe Mössbauer spectroscopy and different wet-chemical analysis methods. Both the maximum oxygen content and the amount of removable oxygen strongly depended on the copper-to-iron ratio. In this respect the samples containing both copper and iron were nearly identical but differed from the end members of the system. In the samples with 0.1≤x≤0.85 the maximum oxygen content varied in the narrow range of w = 0.25-0.33 whereas for the x = 0 and x = 1 samples the values of w = 0.06 and 0.60, respectively, were determined. The amount of removable oxygen (Δw) was the smallest for the Fe-free sample. It is interesting to note that, the maximum oxygen content of the x = 0.5 sample (as well as the samples with 0.15≤x≤0.85) was found to continue the trend of decreasing w with increasing RE ion size, as previously observed for the double-perovskite series BaRE(Fe_0.5Cu_0.5)₂O₅₊₈.

Original language	English
Pages (from-to)	803-808
Number of pages	6
Journal	International Journal of Inorganic Materials
Volume	3
Issue number	7
DOIs	https://doi.org/10.1016/S1466-6049(01)00177-5
Publication status	Published - 2001
MoE publication type	A1 Journal article-refereed

Funding

Useful discussions with Professor L. Niinistö of Helsinki University of Technology are gratefully acknowledged. The present work was supported by the Academy of Finland (decision No. 46039) and also partly by a Grant-in-Aid for Scientific Research of contract No. 11305002 from The Ministry of Education, Science and Culture of Japan, and by an International Collaborative Research Project Grant-2000 of the Materials and Structures Laboratory, Tokyo Institute of Technology.

Keywords

Mössbauer spectroscopy
Oxides
Thermogravimetric analysis
X-ray diffraction

Access to Document

10.1016/S1466-6049(01)00177-5

Cite this

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title = "Oxygen stoichiometry in the (Ba0.5La0.5) (Fe1-xCux)O3-w (x=0-1) perovskite system",

abstract = "Oxygen stoichiometry in the perovskite system (Ba0.5La0.5) (Fe1-xCux)O3-w with x varying in the range of 0 to 1 was studied by thermogravimetry, 57Fe M{\"o}ssbauer spectroscopy and different wet-chemical analysis methods. Both the maximum oxygen content and the amount of removable oxygen strongly depended on the copper-to-iron ratio. In this respect the samples containing both copper and iron were nearly identical but differed from the end members of the system. In the samples with 0.1≤x≤0.85 the maximum oxygen content varied in the narrow range of w = 0.25-0.33 whereas for the x = 0 and x = 1 samples the values of w = 0.06 and 0.60, respectively, were determined. The amount of removable oxygen (Δw) was the smallest for the Fe-free sample. It is interesting to note that, the maximum oxygen content of the x = 0.5 sample (as well as the samples with 0.15≤x≤0.85) was found to continue the trend of decreasing w with increasing RE ion size, as previously observed for the double-perovskite series BaRE(Fe0.5Cu0.5)2O5+8.",

keywords = "M{\"o}ssbauer spectroscopy, Oxides, Thermogravimetric analysis, X-ray diffraction",

author = "K. Lehmus and M. Karppinen and M. Matvejeff and J. Lind{\'e}n and T. Pietari and H. Yamauchi",

year = "2001",

doi = "10.1016/S1466-6049(01)00177-5",

language = "English",

volume = "3",

pages = "803--808",

journal = "International Journal of Inorganic Materials",

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T1 - Oxygen stoichiometry in the (Ba0.5La0.5) (Fe1-xCux)O3-w (x=0-1) perovskite system

AU - Lehmus, K.

AU - Karppinen, M.

AU - Matvejeff, M.

AU - Lindén, J.

AU - Pietari, T.

AU - Yamauchi, H.

PY - 2001

Y1 - 2001

N2 - Oxygen stoichiometry in the perovskite system (Ba0.5La0.5) (Fe1-xCux)O3-w with x varying in the range of 0 to 1 was studied by thermogravimetry, 57Fe Mössbauer spectroscopy and different wet-chemical analysis methods. Both the maximum oxygen content and the amount of removable oxygen strongly depended on the copper-to-iron ratio. In this respect the samples containing both copper and iron were nearly identical but differed from the end members of the system. In the samples with 0.1≤x≤0.85 the maximum oxygen content varied in the narrow range of w = 0.25-0.33 whereas for the x = 0 and x = 1 samples the values of w = 0.06 and 0.60, respectively, were determined. The amount of removable oxygen (Δw) was the smallest for the Fe-free sample. It is interesting to note that, the maximum oxygen content of the x = 0.5 sample (as well as the samples with 0.15≤x≤0.85) was found to continue the trend of decreasing w with increasing RE ion size, as previously observed for the double-perovskite series BaRE(Fe0.5Cu0.5)2O5+8.

AB - Oxygen stoichiometry in the perovskite system (Ba0.5La0.5) (Fe1-xCux)O3-w with x varying in the range of 0 to 1 was studied by thermogravimetry, 57Fe Mössbauer spectroscopy and different wet-chemical analysis methods. Both the maximum oxygen content and the amount of removable oxygen strongly depended on the copper-to-iron ratio. In this respect the samples containing both copper and iron were nearly identical but differed from the end members of the system. In the samples with 0.1≤x≤0.85 the maximum oxygen content varied in the narrow range of w = 0.25-0.33 whereas for the x = 0 and x = 1 samples the values of w = 0.06 and 0.60, respectively, were determined. The amount of removable oxygen (Δw) was the smallest for the Fe-free sample. It is interesting to note that, the maximum oxygen content of the x = 0.5 sample (as well as the samples with 0.15≤x≤0.85) was found to continue the trend of decreasing w with increasing RE ion size, as previously observed for the double-perovskite series BaRE(Fe0.5Cu0.5)2O5+8.

KW - Mössbauer spectroscopy

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KW - Thermogravimetric analysis

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