Synthesis, crystal structure and characterization of iron pyroborate (Fe{sub 2}B{sub 2}O{sub 5}) single crystals
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan)
Single crystals of iron(II) pyroborate, Fe{sub 2}B{sub 2}O{sub 5}, were prepared at 1000-1050 deg. C under an argon atmosphere. The crystals were transparent, yellowish in color and needle-like or columnar. The crystal structure of Fe{sub 2}B{sub 2}O{sub 5} 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) A, alpha=104.613(3){sup o}, beta=90.799(2){sup o} and gamma=91.731(2){sup o}. The final reliability factors of refinement were R1=0.020 and wR2=0.059 [I > 2sigma(I)]. Transmittance over 50% in the visible light region from 500 to 750 nm was observed for a single crystal of Fe{sub 2}B{sub 2}O{sub 5} 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. Fe{sub 2}B{sub 2}O{sub 5} showed antiferromagnetic behavior below the Neel temperature, T{sub N}{approx}70 K, and the Weiss temperature was T{sub W}=36 K. The effective magnetic moment of Fe was 5.3mu{sub B}. - Graphical abstract: View of the crystal structure of Fe{sub 2}B{sub 2}O{sub 5} using FeO{sub 6} octahedra. Fe{sub 2}B{sub 2}O{sub 5} has a quasi-one-dimensional structure, consisting of an [Fe{sub 4}O{sub 18}] unit parallel to the a-axis.
- OSTI ID:
- 21370512
- Journal Information:
- Journal of Solid State Chemistry, Vol. 182, Issue 8; Other Information: DOI: 10.1016/j.jssc.2009.05.009; PII: S0022-4596(09)00217-5; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
ANTIFERROMAGNETISM
ARGON
CATHODOLUMINESCENCE
EV RANGE 01-10
IRON COMPOUNDS
MAGNETIC SUSCEPTIBILITY
MONOCRYSTALS
NEEL TEMPERATURE
SYNTHESIS
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K
TRICLINIC LATTICES
X-RAY DIFFRACTION
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
ELEMENTS
EMISSION
ENERGY RANGE
EV RANGE
FLUIDS
GASES
LUMINESCENCE
MAGNETIC PROPERTIES
MAGNETISM
NONMETALS
PHOTON EMISSION
PHYSICAL PROPERTIES
RARE GASES
SCATTERING
SORPTION
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE