TY - JOUR

T1 - Synthesis and Thermal Behavior of Fe3O2(BO4) Oxoborate

AU - Biryukov, Ya. P.

AU - Bubnova, R. S.

AU - Filatov, S. K.

AU - Goncharov, A. G.

PY - 2016

Y1 - 2016

N2 - Iron oxoborate Fe3O2(BO4) has been first produced in solid-phase chemical reactions. Its thermal behavior in the temperature range 20–900°C is studied with the use in situ high-temperature powder X-ray diffraction. It is shown that Fe3O2(BO4) begins decomposing with the formation of Fe2O3 in the temperature range 660–900°C. Thermal expansion is sharply anisotropic at room temperature (αmax/αmin = 7) and becomes more isotropic with an increase in the temperature (αmax/αmin = 1.2). The degree of oxidation of Fe3+ has been confirmed by Mössbauer spectroscopy (at a room temperature), and two nonequivalent positions in the structure have been detected, which are occupied by iron atoms with the octahedral environment of the oxygen atoms.

AB - Iron oxoborate Fe3O2(BO4) has been first produced in solid-phase chemical reactions. Its thermal behavior in the temperature range 20–900°C is studied with the use in situ high-temperature powder X-ray diffraction. It is shown that Fe3O2(BO4) begins decomposing with the formation of Fe2O3 in the temperature range 660–900°C. Thermal expansion is sharply anisotropic at room temperature (αmax/αmin = 7) and becomes more isotropic with an increase in the temperature (αmax/αmin = 1.2). The degree of oxidation of Fe3+ has been confirmed by Mössbauer spectroscopy (at a room temperature), and two nonequivalent positions in the structure have been detected, which are occupied by iron atoms with the octahedral environment of the oxygen atoms.

M3 - Article

VL - 42

SP - 202

EP - 206

JO - Glass Physics and Chemistry

JF - Glass Physics and Chemistry

SN - 1087-6596

IS - 2

ER -