A.G. Badalyan, V. A. Trepakov
This study presents the results of electron paramagnetic resonance (EPR) investigations on potassium tantalate single crystals doped with Co2+ ions, alongside new findings from ongoing studies of KTaO3:Cu single crystals. Divalent impurity ions, such as Cu2+, substitute the Ta5+ in octahedron positions, necessitating the presence of oxygen vacancies to balance the charge of Ta5+. The observed Cu2+ ions form exclusively axial centers, revealing symmetry axes aligned with cubic directions. Additionally, a new axial center for Co2+ within the KTaO3:Co crystal was identified. Our experiments demonstrate the significant influence of temperature treatments on the distribution of these defect types, particularly as revealed by high-temperature EPR measurements of Cu2+ centers. By heating the crystals to temperatures that enhance the mobility of oxygen vacancies, we observe a defined positioning of oxygen vacancies between pairs of divalent impurity ions. The positioning of vacancies at room temperature, post-cryogenic cooling, depends on the parameters of the cooling process, suggesting the possibility of controlling the relative concentrations of different defect types in the studied crystals. This work was supported by grant AVCR KJB1010301.
@article{db9810c7-ed8a-4e68-a7b3-723b5e7cbcee,
title={Divalent Impurity Ion Defects in Potassium Tantalate: EPR Investigations},
author={A.G. Badalyan and V. A. Trepakov},
year={2003},
language={en}
}TY - JOUR TI - Divalent Impurity Ion Defects in Potassium Tantalate: EPR Investigations AU - A.G. Badalyan AU - V. A. Trepakov PY - 2003 LA - en ER -
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