Abstract
The conditions of formation of FeBO3 single crystals in the Fe2O3-B2O3-PbO-PbF2 system are investigated. The solubility of FeBO3 in the solvent 53.3B2O3-32. 7PbO-14.OPbF3 is 7.2 wt% at 854 °C which is the upper maximum temperature of the phase stability of FeBO3. When measuring the growth rates V of FeBO3 single crystal faces for that composition, upon melt supercooling ΔT indicates that V increases linearly along the [111] direction upon ΔT, while the dependence V upon ΔT in the plane (111) exhibits considerable nonlinearity. The growth rate of radial FeBO3 single crystals in the (111) plane is 1.5.10−3 cm/h and in the plane along the [111] direction it is 4.10−4 cm/h on supercooling at 5 °C in dynamic conditions. The nature of the growth rate distribution of FeBO3 single crystal faces upon ΔT suggests that massive specimens may be grown when supercooling at 3–7 °C. FeBO3 crystals are grown by the temperature regime calculated on the basis of experimental data in controlled conditions. The dimensions of FeBO3 crystals are 5×5×1.5 mm3; the linewidth of antiferromagnetic resonance absorption is 30–50 Oe.
Published Version
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