Anomalous value of the g-factor of localized iron centers in the Al2[SiO4] lattice with strong tetragonal distortion

• Main Authors: Apushkinskiy Evgeniy, Popov Boris, Saveliev Vladimir, Sobolevskiy Vladimir, Krukovskaya Lidia
• Format: Article
• Language: English
• Published: Peter the Great St.Petersburg Polytechnic University 2020-03-01
• Series: St. Petersburg Polytechnical University Journal: Physics and Mathematics
• Subjects: spectrum; center symmetry; hamiltonian; g-factor; topaz; tetragonal distortion
• Online Access: https://physmath.spbstu.ru/article/2020.47.01/

The results of theoretical and experimental studies of the electron paramagnetic resonance (EPR) spectra of iron impurity centers in the Al2[SiO4] lattice are presented. Characteristic defects of the system have been found to lead to the appearance of lines with abnormally large values of g-factors (4.33 and 2.66) in the EPR spectra. The results of the experiment are discussed within the framework of a previously developed model with a defect involving an impurity iron ion replacing the Al3+ or Si4+ ion . The " Fe3+ - vacancy" model is a special case of a complexes with strong tetragonal distortion. The g-factors are calculated taking into account the covalent nature of the bond.