Iron mixed-valence compounds, BaSm(Cu0.5+xFe0.5-x)2O5+δ. I: synthesis and chemical characterization

J. Nakamura; J. Lindén; H. Suematsu; M. Karppinen; H. Yamauchi

doi:10.1016/S0921-4534(00)00213-6

Iron mixed-valence compounds, BaSm(Cu_0.5+xFe_0.5-x)₂O_5+δ. I: synthesis and chemical characterization

J. Nakamura^*, J. Lindén, H. Suematsu, M. Karppinen, H. Yamauchi

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Abstrakti

Oxygen-deficient BaSm(Cu_0.5+xFe_0.5-x)₂O_5+δ (x = -0.5, -0.45, -0.4, -0.1 and 0.0) double-perovskite samples have been successfully obtained by means of a novel synthesis technique utilizing an Fe/FeO getter encapsulated together with the starting material mixture in an evacuated silica-glass tube. The reducing conditions during the synthesis correspond to an oxygen partial pressure of approx. 7.6 × 10^-16 atm. From X-ray diffraction (XRD), transmission electron micrographs (TEM) and energy-dispersive X-ray (EDX) analyses, the samples have been confirmed to be of essentially single phase. By post-annealing the as-synthesized samples under O₂ or H₂/Ar mixed gas, the amount of excess oxygen was controlled. Approaching δ ≈ 0 required prolonged annealing periods under reducing conditions. Samples having -0.4 < x < -0.1 did not form as a single-phase material under the present synthesis conditions.

Alkuperäiskieli	Englanti
Sivut	121-125
Sivumäärä	5
Julkaisu	Physica C: Superconductivity and its Applications
Vuosikerta	338
Numero	1
DOI - pysyväislinkit	https://doi.org/10.1016/S0921-4534(00)00213-6
Tila	Julkaistu - 1 elok. 2000
OKM-julkaisutyyppi	A4 Artikkeli konferenssijulkaisuussa
Tapahtuma	International Discussion Meeting on Chemistry Approaches to High-Tc Superconductive Materials / 5th International Workshop on Chemical Designing and Processing of High-Tc Superconductors (Chem-HTSC-V) - Yokohama, Jpn Kesto: 15 lokak. 1999 → 16 lokak. 1999

Pääsy asiakirjaan

10.1016/S0921-4534(00)00213-6

Muut tiedostot ja linkit

Link to publication in Scopus

Viittausmuodot

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title = "Iron mixed-valence compounds, BaSm(Cu0.5+xFe0.5-x)2O5+δ. I: synthesis and chemical characterization",

abstract = "Oxygen-deficient BaSm(Cu0.5+xFe0.5-x)2O5+δ (x = -0.5, -0.45, -0.4, -0.1 and 0.0) double-perovskite samples have been successfully obtained by means of a novel synthesis technique utilizing an Fe/FeO getter encapsulated together with the starting material mixture in an evacuated silica-glass tube. The reducing conditions during the synthesis correspond to an oxygen partial pressure of approx. 7.6 × 10-16 atm. From X-ray diffraction (XRD), transmission electron micrographs (TEM) and energy-dispersive X-ray (EDX) analyses, the samples have been confirmed to be of essentially single phase. By post-annealing the as-synthesized samples under O2 or H2/Ar mixed gas, the amount of excess oxygen was controlled. Approaching δ ≈ 0 required prolonged annealing periods under reducing conditions. Samples having -0.4 < x < -0.1 did not form as a single-phase material under the present synthesis conditions.",

author = "J. Nakamura and J. Lind{\'e}n and H. Suematsu and M. Karppinen and H. Yamauchi",

year = "2000",

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TY - JOUR

T1 - Iron mixed-valence compounds, BaSm(Cu0.5+xFe0.5-x)2O5+δ. I

T2 - International Discussion Meeting on Chemistry Approaches to High-Tc Superconductive Materials / 5th International Workshop on Chemical Designing and Processing of High-Tc Superconductors (Chem-HTSC-V)

AU - Nakamura, J.

AU - Lindén, J.

AU - Suematsu, H.

AU - Karppinen, M.

AU - Yamauchi, H.

PY - 2000/8/1

Y1 - 2000/8/1

N2 - Oxygen-deficient BaSm(Cu0.5+xFe0.5-x)2O5+δ (x = -0.5, -0.45, -0.4, -0.1 and 0.0) double-perovskite samples have been successfully obtained by means of a novel synthesis technique utilizing an Fe/FeO getter encapsulated together with the starting material mixture in an evacuated silica-glass tube. The reducing conditions during the synthesis correspond to an oxygen partial pressure of approx. 7.6 × 10-16 atm. From X-ray diffraction (XRD), transmission electron micrographs (TEM) and energy-dispersive X-ray (EDX) analyses, the samples have been confirmed to be of essentially single phase. By post-annealing the as-synthesized samples under O2 or H2/Ar mixed gas, the amount of excess oxygen was controlled. Approaching δ ≈ 0 required prolonged annealing periods under reducing conditions. Samples having -0.4 < x < -0.1 did not form as a single-phase material under the present synthesis conditions.

AB - Oxygen-deficient BaSm(Cu0.5+xFe0.5-x)2O5+δ (x = -0.5, -0.45, -0.4, -0.1 and 0.0) double-perovskite samples have been successfully obtained by means of a novel synthesis technique utilizing an Fe/FeO getter encapsulated together with the starting material mixture in an evacuated silica-glass tube. The reducing conditions during the synthesis correspond to an oxygen partial pressure of approx. 7.6 × 10-16 atm. From X-ray diffraction (XRD), transmission electron micrographs (TEM) and energy-dispersive X-ray (EDX) analyses, the samples have been confirmed to be of essentially single phase. By post-annealing the as-synthesized samples under O2 or H2/Ar mixed gas, the amount of excess oxygen was controlled. Approaching δ ≈ 0 required prolonged annealing periods under reducing conditions. Samples having -0.4 < x < -0.1 did not form as a single-phase material under the present synthesis conditions.

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U2 - 10.1016/S0921-4534(00)00213-6

DO - 10.1016/S0921-4534(00)00213-6

M3 - Conference article

AN - SCOPUS:0034248083

SN - 0921-4534

VL - 338

SP - 121

EP - 125

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 1

Y2 - 15 October 1999 through 16 October 1999