Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. Founded at 2009

Features of defective structure of active-uneline crystals of double duality LiTaO3:Cr:Nd and their manifestation in the infrared absorption spectra in the field of valence vibrations of hydrogen atoms of ОН–– groups

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

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

DOI: 10.26456/pcascnn/2025.17.034

Original article

Abstract: The defect structure of a series of LiTaO3 crystals, LiTaO3:Cr (0,005 wt.%), LiTaO3:Cr(0,06):Nd (0,20 wt.%), LiTaO3:Cr(0,09)Nd (0,25 wt.%), LiTaO3:Cr(0,1):Nd (0,25 wt.%), LiTaO3:Cr(0,2):Nd (0,45 wt.%), was studied using infrared absorption spectra in the frequency range of stretching vibrations of hydrogen atoms in OH hydroxyl groups. It was found that the spectra of all crystals contain lines with frequencies in the ranges of 3462-3464 and 3476-3480 cm-1, corresponding to stretching vibrations of hydrogen atoms in OH hydroxyl groups. Such minor differences in the line frequencies are due to differences in the stoichiometry of the crystals (the ratio R=[Li]/[Ta]) and the formation of complex defects (VLi–)-OH. It was found that the absorption band with a frequency of ≈ 3504 cm-1 is associated with the appearance of complex defects CrLi2+-OH-CrTa2-. The Klavier method was used to determine the volume concentration of OH- groups in the crystals, which is maximum for the LiTaO3:Cr(0,09)Nd (0,25 wt%) crystal due to the presence of two types of complex defects (Cr2+Li)-OH-(Cr2-Ta) and (VLi–)-OH.

Keywords: lithium tantalat, double doping Cr and Nd, valence fluctuations in hydrogen atoms of it- groups, point structural defects, complex defects, infrared spectroscopy

  • 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 RAS», Assistant Professor, Department of Physics, Biology and Engineering Technologies Murmansk Arctic University
  • 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 RAS»
  • Alexander Yu.. Pyatyshev – Ph. D., Senior Researcher, Raman laboratories, P.N. Lebedev Physical Institute of the RAS
  • 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 RAS»
  • Mikhail K. Tarabrin – Ph. D., Researcher, Bauman Moscow State Technical University
  • Andrey A. Bushunov – Researcher, Bauman Moscow State Technical University

For citation:

Bobreva L.A., Sidorov N.V., Pyatyshev A.Yu.., Palatnikov M.N., Tarabrin M.K., Bushunov A.A. Osobennosti defektnoj struktury aktivno-nelinejnykh kristallov dvojnogo legirovaniya LiTaO3:Cr:Nd i ikh proyavlenie v infrakrasnykh spektrakh pogloshcheniya v oblasti valentnykh kolebanij ON–-grupp [Features of defective structure of active-uneline crystals of double duality LiTaO3:Cr:Nd and their manifestation in the infrared absorption spectra in the field of valence vibrations of hydrogen atoms of ОН–– groups], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2025, issue 17, pp. 034-043. DOI: 10.26456/pcascnn/2025.17.034. ⎘

Full article (in Russian): download PDF file

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