Magnetic and electric hyperfine parameters of antiferromagnet FеBO3 intended for monochromatization of synchrotron radiation

• Precision studies of the temperature dependence of the Mössbauer spectra of FeBO 3 single crystals have been carried out. • Parameters of hyperfine interaction in FeBO 3 a wide temperature range were accurately determined. • Theoretical analysis of the peculiarities of the hyperfine structure formation of Mössbauer spectra in iron borate was performed. • A technique for correcting Mössbauer spectra taking into account the effective thickness of the absorber was developed. • Debye temperature for cations in the structure of FeBO 3 was determined. In this work, Mössbauer spectroscopy and X-ray diffraction were used to determine the precision values of the hyperfine interaction parameters and the crystal structure of FeBO 3 single crystals in a wide temperature range, including the region of magnetic phase transitions ( T N ). A theoretical model has been developed to describe nuclear resonance transitions in iron atoms in the approximation of a combined magnetic dipole and electric quadrupole hyperfine interaction. A technique for correcting the Mössbauer spectra, considering the effective thickness of the absorber, has also been elaborated. It is shown that the appearance of two additional resonance lines in the hyperfine structure significantly affects the shape of the FeBO 3 spectra near the N é el temperature ( Т N ). The characteristic Debye temperatures for Fe and B cations in the iron borate structure have been determined. The developed technique and the results obtained are extremely important for the use of FeBO 3 crystals in new high-tech branches of science and technology, including optoelectronics and synchrotron technologies.