Annealing-atmosphere control of paramagnetic defects in ZnO microparticles
Abstract
In this work, we used temperature-dependent electron paramagnetic resonance (EPR) spectroscopy to reveal the effect of high-temperature annealing in N2 and air on paramagnetic and electronic properties of ZnO microparticles. EPR spectral simulations have shown that N2 annealing produces Zni, VO+, and shallow-donor centers, whereas Zni, VO+, and Hi-related centers are observed after annealing the ZnO microparticles in an air atmosphere. The resolved paramagnetic centers exhibit distinctly different behavior over 5-297 K. The shallow-donor and Hi signals are rapidly quenched below approximately 50 K, while the Zni contribution shows a nonmonotonic temperature dependence. In contrast, the VO+ signal persists up to room temperature and increases with temperature, consistent with charge redistribution among donor-related defects involving deep oxygen-vacancy states. The cavity Q-factor generally decreases with increasing temperature for both annealed samples, indicating atmosphere-dependent changes in the microwave losses. These results show that the annealing atmosphere controls the paramagnetic defect population, the temperature dependence of donor-related centers, and the associated electronic response of ZnO microparticles.
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BibTeX
@misc{savchenko2026annealingatmosphere,
title = {{Annealing-atmosphere control of paramagnetic defects in ZnO microparticles}},
author = {D. Savchenko and M. Holiatkina and A. Prokhorov and A. Vasin and E. Kalabukhova},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.33870},
eprint = {2610.33870},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.33870},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Annealing-atmosphere control of paramagnetic defects in ZnO microparticles
AU - D. Savchenko
AU - M. Holiatkina
AU - A. Prokhorov
AU - A. Vasin
AU - E. Kalabukhova
PY - 2026
DA - 2026/10/24
PB - arXiv
DO - 10.48550/arxiv.2610.33870
UR - https://arxiv.org/abs/2610.33870
AB - In this work, we used temperature-dependent electron paramagnetic resonance (EPR) spectroscopy to reveal the effect of high-temperature annealing in N2 and air on paramagnetic and electronic properties of ZnO microparticles. EPR spectral simulations have shown that N2 annealing produces Zni, VO+, and shallow-donor centers, whereas Zni, VO+, and Hi-related centers are observed after annealing the ZnO microparticles in an air atmosphere. The resolved paramagnetic centers exhibit distinctly different behavior over 5-297 K. The shallow-donor and Hi signals are rapidly quenched below approximately 50 K, while the Zni contribution shows a nonmonotonic temperature dependence. In contrast, the VO+ signal persists up to room temperature and increases with temperature, consistent with charge redistribution among donor-related defects involving deep oxygen-vacancy states. The cavity Q-factor generally decreases with increasing temperature for both annealed samples, indicating atmosphere-dependent changes in the microwave losses. These results show that the annealing atmosphere controls the paramagnetic defect population, the temperature dependence of donor-related centers, and the associated electronic response of ZnO microparticles.
ER -