Temperature dependence of the EPR signal in ZnO

Authors

  • O. V. Khmelenko Oles Honchar Dnipro National University, Dnipro, Ukraine
  • A. Yu. Lyashkov Oles Honchar Dnipro National University, Dnipro, Ukraine
  • V. R. Kolbunov Oles Honchar Dnipro National University, Dnipro, Ukraine
  • Yu. O. Hladka Oles Honchar Dnipro National University, Dnipro, Ukraine
  • O. V. Vasheruk Oles Honchar Dnipro National University, Dnipro, Ukraine

DOI:

https://doi.org/10.15421/332209

Keywords:

zinc oxide, electron paramagnetic resonance, electrical conductivity, dielectric permittivity

Abstract

Ceramics based on zinc oxide doped with lithium was fabricated. It is shown that an increase in the lithium content in an amount up to 0.1% leads to a decrease in electrical conductivity, and then in the range up to 3% to its increase. The real and imaginary parts of the permittivity decrease with increasing lithium concentration over the entire range of measured frequencies (50 kHz - 3 MHz). Similarly, the signal of the EPR line with g-factor ~1.96 decreases.

An analysis of the temperature dependence of the EPR signal intensity with a g factor of ~1.96 gives an activation energy of 0.06 eV, which practically coincides with the depth of shallow donors in ZnO. This makes it possible to identify the EPR signal with g-factor ~1.96 with oxygen vacancies.

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Published

23-11-2022

Issue

Vol. 30 No. 1 (2022)

Section

Articles