Jump to main content
Jump to site search

Issue 1, 1999
Previous Article Next Article

Synthesis, structure and properties of a semivalent iron oxoborate, Fe2OBO3

Abstract

Transition metal oxoborates are of interest for magnetic and optical properties. Crystals of many M II 2 M III O 2 BO 3 and M II M III OBO 3 materials can be grown from borate fluxes. In the Fe II -Fe III -B-O system, flux growth results in Fe 3 O 2 BO 3 crystals, but solid state reaction at higher temperatures has yielded Fe 2 OBO 3 as a polycrystalline powder. This has been characterised by synchrotron and neutron diffraction, electron microscopy, Mössbauer spectroscopy, and conductivity and magnetic measurements. Two notable transitions occur, a broad semiconductor-semiconductor change accompanied by a structural transition at 317 K, and L-type ferrimagnetic order below a Curie temperature of 155 K. An average (Fe 2+ ) 0.5 (Fe 3+ ) 0.5 valence is observed at the two crystallographically distinct sites in Fe 2 OBO 3 , indicating that charge ordering occurs.

Back to tab navigation

Article type: Paper
DOI: 10.1039/A804642E
Citation: J. Mater. Chem., 1999,9, 205-209
  •   Request permissions

    Synthesis, structure and properties of a semivalent iron oxoborate, Fe2OBO3

    J. P. Attfield, A. M. T. Bell, L. M. Rodriguez-Martinez, J. M. Greneche, R. Retoux, R. J. Cernik, J. F. Clarke and D. A. Perkins, J. Mater. Chem., 1999, 9, 205
    DOI: 10.1039/A804642E

Search articles by author

Spotlight

Advertisements