Iron and molybdenum valences in double-perovskite (Sr,Nd)2FeMoO6: Electron-doping effect

J. Lindén; T. Shimada; T. Motohashi; H. Yamauchi; M. Karppinen

doi:10.1016/j.ssc.2003.09.025

Iron and molybdenum valences in double-perovskite (Sr,Nd)₂FeMoO₆: Electron-doping effect

J. Lindén, T. Shimada, T. Motohashi, H. Yamauchi, M. Karppinen^*

^*Corresponding author for this work

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

39 Citations (Scopus)

Abstract

Double perovskite, (Sr_1-xNd_x)₂FeMoO₆, was doped with electrons through partial substitution of divalent Sr by trivalent Nd (0 ≤ x ≤ 0.2). The Fe valence and the degree of B-site order were probed by ⁵⁷Fe Mössbauer spectroscopy. Replacing Sr by Nd increased the fraction of Fe and Mo atoms occupying wrong sites, i.e. antisite disorder. It had very little effect on the Fe valence: a small but visible increase in the isomer shift was seen for the mixed-valent Fe ^II/III atoms occupying the right site indicating a slight movement towards divalency of these atoms, which was more than counterbalanced by the increase in the fraction of antisite Fe atoms with III valence state. It is therefore argued that the bulk of the electron doping is received by antisite Mo atoms, which - being surrounded by six Mo^V/VI atoms-prefer the lower IV/V valence state. Thus under Nd substitution, the charge-neutrality requirement inflicts a lattice disorder such that low - valent Mo ^IV/V can exist.

Original language	English
Pages (from-to)	129-133
Number of pages	5
Journal	Solid State Communications
Volume	129
Issue number	2
DOIs	https://doi.org/10.1016/j.ssc.2003.09.025
Publication status	Published - Jan 2004
MoE publication type	A1 Journal article-refereed

Funding

This work was supported by Grants-in-aid for Scientific Research (Nos. 15206002 and 15206071) from Japan Society for the Promotion of Science. J.L. acknowledges support from the Scandinavia-Sasakawa foundation. N. Kaihovirta and K. Gustafsson are acknowledged for their assistance with the Mössbauer measurements.

Keywords

A. Magnetically ordered materials
B Chemical synthesis
D. Valence fluctuations
E. Nuclear resonances

Access to Document

10.1016/j.ssc.2003.09.025

Cite this

@article{40e930d30c8d4312bb725d3bd39bb316,

title = "Iron and molybdenum valences in double-perovskite (Sr,Nd)2FeMoO6: Electron-doping effect",

abstract = "Double perovskite, (Sr1-xNdx)2FeMoO6, was doped with electrons through partial substitution of divalent Sr by trivalent Nd (0 ≤ x ≤ 0.2). The Fe valence and the degree of B-site order were probed by 57Fe M{\"o}ssbauer spectroscopy. Replacing Sr by Nd increased the fraction of Fe and Mo atoms occupying wrong sites, i.e. antisite disorder. It had very little effect on the Fe valence: a small but visible increase in the isomer shift was seen for the mixed-valent Fe II/III atoms occupying the right site indicating a slight movement towards divalency of these atoms, which was more than counterbalanced by the increase in the fraction of antisite Fe atoms with III valence state. It is therefore argued that the bulk of the electron doping is received by antisite Mo atoms, which - being surrounded by six MoV/VI atoms-prefer the lower IV/V valence state. Thus under Nd substitution, the charge-neutrality requirement inflicts a lattice disorder such that low - valent Mo IV/V can exist.",

keywords = "A. Magnetically ordered materials, B Chemical synthesis, D. Valence fluctuations, E. Nuclear resonances",

author = "J. Lind{\'e}n and T. Shimada and T. Motohashi and H. Yamauchi and M. Karppinen",

year = "2004",

month = jan,

doi = "10.1016/j.ssc.2003.09.025",

language = "English",

volume = "129",

pages = "129--133",

journal = "Solid State Communications",

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TY - JOUR

T1 - Iron and molybdenum valences in double-perovskite (Sr,Nd)2FeMoO6

T2 - Electron-doping effect

AU - Lindén, J.

AU - Shimada, T.

AU - Motohashi, T.

AU - Yamauchi, H.

AU - Karppinen, M.

PY - 2004/1

Y1 - 2004/1

N2 - Double perovskite, (Sr1-xNdx)2FeMoO6, was doped with electrons through partial substitution of divalent Sr by trivalent Nd (0 ≤ x ≤ 0.2). The Fe valence and the degree of B-site order were probed by 57Fe Mössbauer spectroscopy. Replacing Sr by Nd increased the fraction of Fe and Mo atoms occupying wrong sites, i.e. antisite disorder. It had very little effect on the Fe valence: a small but visible increase in the isomer shift was seen for the mixed-valent Fe II/III atoms occupying the right site indicating a slight movement towards divalency of these atoms, which was more than counterbalanced by the increase in the fraction of antisite Fe atoms with III valence state. It is therefore argued that the bulk of the electron doping is received by antisite Mo atoms, which - being surrounded by six MoV/VI atoms-prefer the lower IV/V valence state. Thus under Nd substitution, the charge-neutrality requirement inflicts a lattice disorder such that low - valent Mo IV/V can exist.

AB - Double perovskite, (Sr1-xNdx)2FeMoO6, was doped with electrons through partial substitution of divalent Sr by trivalent Nd (0 ≤ x ≤ 0.2). The Fe valence and the degree of B-site order were probed by 57Fe Mössbauer spectroscopy. Replacing Sr by Nd increased the fraction of Fe and Mo atoms occupying wrong sites, i.e. antisite disorder. It had very little effect on the Fe valence: a small but visible increase in the isomer shift was seen for the mixed-valent Fe II/III atoms occupying the right site indicating a slight movement towards divalency of these atoms, which was more than counterbalanced by the increase in the fraction of antisite Fe atoms with III valence state. It is therefore argued that the bulk of the electron doping is received by antisite Mo atoms, which - being surrounded by six MoV/VI atoms-prefer the lower IV/V valence state. Thus under Nd substitution, the charge-neutrality requirement inflicts a lattice disorder such that low - valent Mo IV/V can exist.

KW - A. Magnetically ordered materials

KW - B Chemical synthesis

KW - D. Valence fluctuations

KW - E. Nuclear resonances

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DO - 10.1016/j.ssc.2003.09.025

M3 - Article

AN - SCOPUS:0242695700

SN - 0038-1098

VL - 129

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EP - 133

JO - Solid State Communications

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