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

^*Tämän työn vastaava kirjoittaja

Fysiikka

Tutkimustuotos: Lehtiartikkeli › Konferenssiartikkeli › Tieteellinen › vertaisarvioitu

9 Sitaatiot (Scopus)

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

Rahoitus

Dr. S.R. Lee is acknowledged for useful advice during the course of this work. One of the authors (J.L.) acknowledges the kind support from the Japan Society for the Promotion of Science. The present work has been supported by a Grant-in-Aid for Scientific Research (contract No. 11305002) from The Ministry of Education, Science and Culture of Japan, and also by an International Collaborative Research Project Grant-1999 of the Materials and Structures Laboratory, Tokyo Institute of Technology.

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 {\texttimes} 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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doi = "10.1016/S0921-4534(00)00213-6",

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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

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

M3 - Conference article

AN - SCOPUS:0034248083

SN - 0921-4534

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JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

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