Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials
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Features of the defect structure of LiNbO3:Cu crystals and their manifestation in the IR absorption spectrum in the region of stretching vibrations of hydrogen atoms OН– -group

N.V. Sidorov1, L.A. Bobreva1,2, M.N. Palatnikov1, A.Yu. Pyatyshev3, M.K. Tarabrin4, A.A. Bushunov4

1 Tananaev Institute of Chemistry  Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»
2 Murmansk Arctic University
3 P.N. Lebedev Physical Institute of the Russian Academy of Sciences
4 Bauman Moscow State Technical University

DOI: 10.26456/pcascnn/2024.16.277

Original article

Abstract: LiNbO3:Cu (0,005 wt.%), LiNbO3:Cu (0,015 wt.%), LiNbO3:Cu (0,022 wt.%), LiNbO3:Cu (0,042 wt.%), LiNbO3:Cu (0,46 wt.%) crystals were studied by IR absorption spectroscopy in the region of stretching vibrations of OH–-groups. These crystals were grown by the Czochralski method using the technology of direct doping of a charge of congruent composition. It has been established that the recorded absorption bands in the infrared spectrum in the frequency range 3469-3490 cm-1 are associated with a deviation in the composition of the LiNbO3:Cu crystal from the stoichiometric one. Such changes occur due to a deficiency of Li+ cations in the crystal structure. The incorporation of Cu2+ dopant leads to disordering of the cation sublattice and noticeable deformation of oxygen octahedra. This occurs due to an increase in the O–O bond lengths. In this case, a newabsorption band with a frequency of 3487 cm-1, corresponding to the VLi-OH complex defect, is recorded in the IR spectrum. Calculation of the volume concentration of OH–– groups showed the highest value for crystals ofLiNbO3:Cu (0,005 wt.%), LiNbO3:Cu (0,015 wt.%), LiNbO3:Cu (0,022 wt.%). These changes occur due to the simultaneous formation of two types of complex defects in the crystal structure: Cu+-OH-Cu3- and VLi-OH. A change in the mechanism of entry of a doping impurity into the structure of a LiNbO3:Cu crystal (0,042 wt.%) leads to a decrease in the concentration of OH–– groups.

Keywords: lithium niobate, photorefractive impurity, point defects, complex defects, infrafed spectroscopy

  • Nikolay V. Sidorov – Dr. Sc., Professor, Chief Researcher and as Head of Vibrational Spectroscopy Sector of the Electronic Engineering Materials Laboratory, Tananaev Institute of Chemistry  Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»
  • Lyubov A. Bobreva – Ph. D., Researcher, Vibrational Spectroscopy Sector of the Electronic Engineering Materials Laboratory, Tananaev Institute of Chemistry  Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences», Assistant Professor, Department of Physics, Biology and Engineering Technologie Murmansk Arctic University
  • Mikhail N. Palatnikov – Dr. Sc., Chief Researcher and as Head of the Electronic Engineering Materials Laboratory, Tananaev Institute of Chemistry  Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»
  • Alexander Yu. Pyatyshev – Ph. D., Senior Researcher, Raman laboratories, P.N. Lebedev Physical Institute of the Russian Academy of Sciences
  • Mikhail K. Tarabrin – Ph. D., Researcher, Bauman Moscow State Technical University
  • Andrey A. Bushunov – Researcher, Bauman Moscow State Technical University

Reference:

Sidorov, N.V. Features of the defect structure of LiNbO3:Cu crystals and their manifestation in the IR absorption spectrum in the region of stretching vibrations of hydrogen atoms OН– -group / N.V. Sidorov, L.A. Bobreva, M.N. Palatnikov, A.Yu. Pyatyshev, M.K. Tarabrin, A.A. Bushunov // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. — 2024. — I. 16. — P. 277-288. DOI: 10.26456/pcascnn/2024.16.277. (In Russian).

Full article (in Russian): download PDF file

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