Oxygen Stoichiometry in BaRE(Cu0.5Fe0.5)2O5+δ Compounds with Perovskite or Double Perovskite Structure

K. Peitola; M. Kochi; M. Karppinen; H. Yamauchi; L. Niinistö; J. Lindén

doi:10.1023/a:1022538521325

Oxygen Stoichiometry in BaRE(Cu_0.5Fe_0.5)₂O_5+δ Compounds with Perovskite or Double Perovskite Structure

K. Peitola^*, M. Kochi, M. Karppinen, H. Yamauchi, L. Niinistö, J. Lindén

^*Corresponding author for this work

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

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Abstract

The oxygen stoichiometry variation in the BaRE(Cu_0.5Fe_0.5)₂O_5+δ series is established with rare earth elements having ionic radii (CN = 8) in the range of 0.977-1.160 Å (Lu-La). The double-perovskite structure is stable with RE = Lu-Pr, while La prefers the simple-perovskite structure. In the double-perovskite structures with RE = Lu-Sm the oxygen content was found to be constant (δ ≈ 0) against normal-pressure oxidative and reductive heat treatments, whereas a larger rare earth ion, i. e. Nd or Pr, allows continuous oxygen content tuning within about 0.23 and 0.32 oxygen atoms, respectively. In the La perovskite the oxygen content could be varied from δ ≈ 0 to 0.45. The ⁵⁷Fe Mössbauer spectroscopy measurements revealed that the transition temperature of magnetic ordering decreased with an increase in the oxygen content for both the double- and simple-perovskite structures.

Original language	English
Pages (from-to)	861-865
Number of pages	5
Journal	Journal of Low Temperature Physics
Volume	117
Issue number	3-4
DOIs	https://doi.org/10.1023/a:1022538521325
Publication status	Published - 1999
MoE publication type	A1 Journal article-refereed

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title = "Oxygen Stoichiometry in BaRE(Cu0.5Fe0.5)2O5+δ Compounds with Perovskite or Double Perovskite Structure",

abstract = "The oxygen stoichiometry variation in the BaRE(Cu0.5Fe0.5)2O5+δ series is established with rare earth elements having ionic radii (CN = 8) in the range of 0.977-1.160 {\AA} (Lu-La). The double-perovskite structure is stable with RE = Lu-Pr, while La prefers the simple-perovskite structure. In the double-perovskite structures with RE = Lu-Sm the oxygen content was found to be constant (δ ≈ 0) against normal-pressure oxidative and reductive heat treatments, whereas a larger rare earth ion, i. e. Nd or Pr, allows continuous oxygen content tuning within about 0.23 and 0.32 oxygen atoms, respectively. In the La perovskite the oxygen content could be varied from δ ≈ 0 to 0.45. The 57Fe M{\"o}ssbauer spectroscopy measurements revealed that the transition temperature of magnetic ordering decreased with an increase in the oxygen content for both the double- and simple-perovskite structures.",

author = "K. Peitola and M. Kochi and M. Karppinen and H. Yamauchi and L. Niinist{\"o} and J. Lind{\'e}n",

year = "1999",

doi = "10.1023/a:1022538521325",

language = "English",

volume = "117",

pages = "861--865",

journal = "Journal of Low Temperature Physics",

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T1 - Oxygen Stoichiometry in BaRE(Cu0.5Fe0.5)2O5+δ Compounds with Perovskite or Double Perovskite Structure

AU - Peitola, K.

AU - Kochi, M.

AU - Karppinen, M.

AU - Yamauchi, H.

AU - Niinistö, L.

AU - Lindén, J.

PY - 1999

Y1 - 1999

N2 - The oxygen stoichiometry variation in the BaRE(Cu0.5Fe0.5)2O5+δ series is established with rare earth elements having ionic radii (CN = 8) in the range of 0.977-1.160 Å (Lu-La). The double-perovskite structure is stable with RE = Lu-Pr, while La prefers the simple-perovskite structure. In the double-perovskite structures with RE = Lu-Sm the oxygen content was found to be constant (δ ≈ 0) against normal-pressure oxidative and reductive heat treatments, whereas a larger rare earth ion, i. e. Nd or Pr, allows continuous oxygen content tuning within about 0.23 and 0.32 oxygen atoms, respectively. In the La perovskite the oxygen content could be varied from δ ≈ 0 to 0.45. The 57Fe Mössbauer spectroscopy measurements revealed that the transition temperature of magnetic ordering decreased with an increase in the oxygen content for both the double- and simple-perovskite structures.

AB - The oxygen stoichiometry variation in the BaRE(Cu0.5Fe0.5)2O5+δ series is established with rare earth elements having ionic radii (CN = 8) in the range of 0.977-1.160 Å (Lu-La). The double-perovskite structure is stable with RE = Lu-Pr, while La prefers the simple-perovskite structure. In the double-perovskite structures with RE = Lu-Sm the oxygen content was found to be constant (δ ≈ 0) against normal-pressure oxidative and reductive heat treatments, whereas a larger rare earth ion, i. e. Nd or Pr, allows continuous oxygen content tuning within about 0.23 and 0.32 oxygen atoms, respectively. In the La perovskite the oxygen content could be varied from δ ≈ 0 to 0.45. The 57Fe Mössbauer spectroscopy measurements revealed that the transition temperature of magnetic ordering decreased with an increase in the oxygen content for both the double- and simple-perovskite structures.

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JF - Journal of Low Temperature Physics

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ER -

Oxygen Stoichiometry in BaRE(Cu_0.5Fe_0.5)₂O_5+δ Compounds with Perovskite or Double Perovskite Structure

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