57Fe Mössbauer spectroscopy investigation of the Fe II/III mixed-valence state and the B-site order in double perovskite A2FeMoO6

Johan Lindén; Hisao Yamauchi; Maarit Karppinen

doi:10.1016/j.jmmm.2003.11.351

⁵⁷Fe Mössbauer spectroscopy investigation of the Fe ^II/III mixed-valence state and the B-site order in double perovskite A₂FeMoO₆

Johan Lindén^*, Hisao Yamauchi, Maarit Karppinen

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › Scientific › peer-review

4 Citations (Scopus)

Abstract

B-site ordered double-perovskite samples A₂FeMoO₆, with A=Ca, Sr or Ba were synthesized in a reducing atmosphere using an encapsulation technique. The samples were characterized by ⁵⁷Fe Mössbauer spectroscopy. The valence of Fe was found to be in an intermediate II/III state, being close to the midpoint for A=Sr and slightly shifted towards II for Ba. The degree of B-site ordering was found to be more than 95%. Using various synthesis temperatures the ordering could be tuned. Fe atoms replacing Mo at the antisite and adjacent to it were identified in the Mössbauer data. Presence of antiphase boundaries was also seen.

Original language	English
Pages (from-to)	843-844
Number of pages	2
Journal	Journal of Magnetism and Magnetic Materials
Volume	272-276
DOIs	https://doi.org/10.1016/j.jmmm.2003.11.351
Publication status	Published - May 2004
MoE publication type	A4 Article in a conference publication
Event	Proceedings of the International Conference on Magnetism - Rome, Italy Duration: 27 Jul 2003 → 1 Aug 2003

Keywords

Double perovskite
Halfmetal
Mössbauer
Valence mixing

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10.1016/j.jmmm.2003.11.351

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title = "57Fe M{\"o}ssbauer spectroscopy investigation of the Fe II/III mixed-valence state and the B-site order in double perovskite A2FeMoO6",

abstract = "B-site ordered double-perovskite samples A2FeMoO6, with A=Ca, Sr or Ba were synthesized in a reducing atmosphere using an encapsulation technique. The samples were characterized by 57Fe M{\"o}ssbauer spectroscopy. The valence of Fe was found to be in an intermediate II/III state, being close to the midpoint for A=Sr and slightly shifted towards II for Ba. The degree of B-site ordering was found to be more than 95%. Using various synthesis temperatures the ordering could be tuned. Fe atoms replacing Mo at the antisite and adjacent to it were identified in the M{\"o}ssbauer data. Presence of antiphase boundaries was also seen.",

keywords = "Double perovskite, Halfmetal, M{\"o}ssbauer, Valence mixing",

author = "Johan Lind{\'e}n and Hisao Yamauchi and Maarit Karppinen",

year = "2004",

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doi = "10.1016/j.jmmm.2003.11.351",

language = "English",

volume = "272-276",

pages = "843--844",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

note = "Proceedings of the International Conference on Magnetism ; Conference date: 27-07-2003 Through 01-08-2003",

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TY - JOUR

T1 - 57Fe Mössbauer spectroscopy investigation of the Fe II/III mixed-valence state and the B-site order in double perovskite A2FeMoO6

AU - Lindén, Johan

AU - Yamauchi, Hisao

AU - Karppinen, Maarit

PY - 2004/5

Y1 - 2004/5

N2 - B-site ordered double-perovskite samples A2FeMoO6, with A=Ca, Sr or Ba were synthesized in a reducing atmosphere using an encapsulation technique. The samples were characterized by 57Fe Mössbauer spectroscopy. The valence of Fe was found to be in an intermediate II/III state, being close to the midpoint for A=Sr and slightly shifted towards II for Ba. The degree of B-site ordering was found to be more than 95%. Using various synthesis temperatures the ordering could be tuned. Fe atoms replacing Mo at the antisite and adjacent to it were identified in the Mössbauer data. Presence of antiphase boundaries was also seen.

AB - B-site ordered double-perovskite samples A2FeMoO6, with A=Ca, Sr or Ba were synthesized in a reducing atmosphere using an encapsulation technique. The samples were characterized by 57Fe Mössbauer spectroscopy. The valence of Fe was found to be in an intermediate II/III state, being close to the midpoint for A=Sr and slightly shifted towards II for Ba. The degree of B-site ordering was found to be more than 95%. Using various synthesis temperatures the ordering could be tuned. Fe atoms replacing Mo at the antisite and adjacent to it were identified in the Mössbauer data. Presence of antiphase boundaries was also seen.

KW - Double perovskite

KW - Halfmetal

KW - Mössbauer

KW - Valence mixing

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U2 - 10.1016/j.jmmm.2003.11.351

DO - 10.1016/j.jmmm.2003.11.351

M3 - Conference article

AN - SCOPUS:2642540290

SN - 0304-8853

VL - 272-276

SP - 843

EP - 844

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

T2 - Proceedings of the International Conference on Magnetism

Y2 - 27 July 2003 through 1 August 2003

ER -

⁵⁷Fe Mössbauer spectroscopy investigation of the Fe ^II/III mixed-valence state and the B-site order in double perovskite A₂FeMoO₆

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Keywords

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