Synthesis, crystal structure and characterization of iron pyroborate (Fe2B2O5) single crystals

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Single crystals of iron(II) pyroborate, Fe2B2O5, were prepared at 1000-1050 °C under an argon atmosphere. The crystals were transparent, yellowish in color and needle-like or columnar. The crystal structure of Fe2B2O5 was analyzed by single-crystal X-ray diffraction. Refined triclinic unit cell parameters were a=3.2388(2), b=6.1684(5), c=9.3866(8) Å, α=104.613(3)°, β=90.799(2)° and γ=91.731(2)°. The final reliability factors of refinement were R1=0.020 and wR2=0.059 [I > 2σ(I)]. Transmittance over 50% in the visible light region from 500 to 750 nm was observed for a single crystal of Fe2B2O5 with a thickness of about 0.3 mm. The light absorption edge estimated from a diffuse reflectance spectrum was at around 350 nm (3.6 eV). Magnetic susceptibility was measured for single crystals at 4-300 K. Fe2B2O5 showed antiferromagnetic behavior below the Néel temperature, TN≈70 K, and the Weiss temperature was TW=36 K. The effective magnetic moment of Fe was 5.3μB.

Original languageEnglish
Pages (from-to)2004-2009
Number of pages6
JournalJournal of Solid State Chemistry
Issue number8
Publication statusPublished - 2009 Aug


  • Cathodoluminescence
  • Crystal structure
  • Diffuse reflectance
  • Iron pyroborate
  • Light transmittance
  • Magnetic susceptibility
  • Single-crystal X-ray diffraction
  • Synthesis


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