The influence of ruthenium on the magnetic properties of γ-Fe2O3 (maghemite) studied by Mossbauer spectroscopy

被引：0
|
作者：
Helgason, Ö
Greneche, JM
Berry, FJ
Mosselmans, F
机构：
[1] Univ Iceland, Inst Sci, IS-107 Reykjavik, Iceland
[2] Univ Maine, LPEC, UMR 6087, F-72085 Le Mans 9, France
[3] Open Univ, Dept Chem, Milton Keynes MK7 6AA, Bucks, England
[4] CLRC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2003年 / 15卷 / 17期
关键词：
D O I：
暂无
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Ruthenium-doped gamma-Fe2O3 has been synthesized and examined by x-ray powder diffraction, XANES, EXAFS and by Fe-57 Mossbauer spectroscopy. Ruthenium K-edge x-ray absorption spectroscopy shows that ruthenium adopts a fully occupied octahedral site in the spinel related gamma-Fe2O3 structure as Ru4+. The Fe-57 Mossbauer spectra recorded in the presence of a longitudinal magnetic field of 6 T confirmed the octahedral coordination of the tetravalent ions and canting angles for the Fe3+ ions were determined as 24degrees for those in octahedral sites and 33degrees for those in tetrahedral sites. The Fe-57 Mossbauer spectra recorded in situ from ruthenium-doped gamma-Fe2O3 showed parameters typical of maghemite up to 600 K but with a magnetic hyperfine field distribution suggesting an inhomogeneous distribution of ruthenium within particles of varied size around about 15 nm. At 700 K a phase transition from gamma-Fe2O3 to alpha-Fe2O3 was observed and further studies showed the ruthenium-doped alpha-Fe2O3 to have a Morin transition temperature of about 400 K.
引用
收藏
页码：2907 / 2915
页数：9
相关论文
共 50 条
  • [41] Effect of Magnesium Ion Substitution on Physical Properties and Magnetic Induction Heating of Maghemite (γ-Fe2O3) Nanoparticles
    O. M. Lemine
    Abdulrahman Faqih
    Saja Algessair
    N. Madkhali
    M. Hjiri
    Sharif Abu Alrub
    Ali Z. Alanazi
    Abdulaziz Alromaeh
    L. E. L. Mir
    Journal of Superconductivity and Novel Magnetism, 2023, 36 : 1583 - 1593
  • [42] Pressure induced phase transition of nanocrystalline and bulk maghemite (γ-Fe2O3) to hematite (α-Fe2O3)
    Zhu, Hongyang
    Ma, Yanzhang
    Yang, Haibin
    Ji, Cheng
    Hou, Dongbin
    Guo, Lingyun
    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2010, 71 (08) : 1183 - 1186
  • [43] In situ XRD study of the phase transition of nanocrystalline maghemite (γ-Fe2O3) to hematite (α-Fe2O3)
    Schimanke, G
    Martin, M
    SOLID STATE IONICS, 2000, 136 : 1235 - 1240
  • [44] Preparation of superparamagnetic maghemite (γ-Fe2O3) nanoparticles by wet chemical route and investigation of their magnetic and dielectric properties
    Ali, Kashif
    Sarfraz, A. K.
    Mirza, Imran M.
    Bahadur, A.
    Iqbal, S.
    ul Haq, A.
    CURRENT APPLIED PHYSICS, 2015, 15 (08) : 925 - 929
  • [45] Interaction of neptunyl with goethite (α-FeOOH), maghemite (γ-Fe2O3), and hematite (α-Fe2O3) in water as probed by X-ray photoelectron spectroscopy
    A. Yu. Teterin
    K. I. Maslakov
    Yu. A. Teterin
    S. N. Kalmykov
    K. E. Ivanov
    L. Vukcevic
    A. B. Khasanova
    N. S. Shcherbina
    Russian Journal of Inorganic Chemistry, 2006, 51 : 1937 - 1944
  • [46] Interaction of neptunyl with goethite (α-FeOOH), maghemite (γ-Fe2O3), and hematite (α-Fe2O3) in water as probed by X-ray photoelectron spectroscopy
    Teterin, A. Yu.
    Maslakov, K. I.
    Teterin, Yu. A.
    Kalmykov, S. N.
    Ivanov, K. E.
    Vukcevic, L.
    Khasanova, A. B.
    Shcherbina, N. S.
    RUSSIAN JOURNAL OF INORGANIC CHEMISTRY, 2006, 51 (12) : 1937 - 1944
  • [47] Influence of Fe2O3 on the tunneling structure and magnetic properties of zinc ferrite
    Zhang, Dongjie
    Du, Youwei
    Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research, 2004, 18 (01): : 34 - 38
  • [48] Rietveld analysis and Mossbauer spectroscopy studies of nanocrystalline hematite α-Fe2O3
    Lemine, O. M.
    Sajieddine, M.
    Bououdina, M.
    Msalam, R.
    Mufti, S.
    Alyamani, A.
    JOURNAL OF ALLOYS AND COMPOUNDS, 2010, 502 (02) : 279 - 282
  • [49] MAGHEMITE IN BASALT STUDIED BY MOSSBAUER-SPECTROSCOPY IN EXTERNAL MAGNETIC-FIELD
    HELGASON, O
    GUNNLAUGSSON, HP
    STEINTHORSSON, S
    KOCH, CB
    MORUP, S
    HYPERFINE INTERACTIONS, 1994, 91 (1-4): : 583 - 587
  • [50] Mossbauer spectroscopy study of Fe2O3 as an oxidation catalyst for carbonaceous materials
    Boellaard, E
    Neeft, JPA
    Makkee, M
    Moulijn, JA
    vanderKraan, AM
    INTERNATIONAL CONFERENCE ON THE APPLICATIONS OF THE MOSSBAUER EFFECT - ICAME-95, 1996, 50 : 677 - 680
12345