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
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...
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Tver State University
2024-12-01
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| Series: | Физико-химические аспекты изучения кластеров, наноструктур и наноматериалов |
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| Online Access: | https://physchemaspects.ru/2024/doi-10-26456-pcascnn-2024-16-277/?lang=en |
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| author | N.V. Sidorov L.A. Bobreva M.N. Palatnikov A.Yu. Pyatyshev M.K. Tarabrin A.A. Bushunov |
| author_facet | N.V. Sidorov L.A. Bobreva M.N. Palatnikov A.Yu. Pyatyshev M.K. Tarabrin A.A. Bushunov |
| author_sort | N.V. Sidorov |
| collection | DOAJ |
| description | 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 new
absorption 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 of
LiNbO3: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. |
| format | Article |
| id | doaj-art-9f70b9bb12294527a3d56ae6feae5934 |
| institution | Kabale University |
| issn | 2226-4442 2658-4360 |
| language | Russian |
| publishDate | 2024-12-01 |
| publisher | Tver State University |
| record_format | Article |
| series | Физико-химические аспекты изучения кластеров, наноструктур и наноматериалов |
| spelling | doaj-art-9f70b9bb12294527a3d56ae6feae59342024-12-26T13:13:57ZrusTver State UniversityФизико-химические аспекты изучения кластеров, наноструктур и наноматериалов2226-44422658-43602024-12-011627728810.26456/pcascnn/2024.16.277Features 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– -groupN.V. Sidorov0L.A. Bobreva1M.N. Palatnikov2A.Yu. Pyatyshev3M.K. Tarabrin4A.A. Bushunov5Tananaev Institute of Chemistry Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»Tananaev Institute of Chemistry – Subdivision of the Federal Research Centre «Kola Science Centre of the RAS»Tananaev Institute of Chemistry – Subdivision of the Federal Research Centre «Kola Science Centre of the RAS»P.N. Lebedev Physical Institute of the Russian Academy of SciencesBauman Moscow State Technical UniversityBauman Moscow State Technical UniversityLiNbO3: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 new absorption 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 of LiNbO3: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. https://physchemaspects.ru/2024/doi-10-26456-pcascnn-2024-16-277/?lang=enlithium niobatephotorefractive impuritypoint defectscomplex defectsinfrafed spectroscopy |
| spellingShingle | N.V. Sidorov L.A. Bobreva M.N. Palatnikov A.Yu. Pyatyshev M.K. Tarabrin A.A. Bushunov 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 Физико-химические аспекты изучения кластеров, наноструктур и наноматериалов lithium niobate photorefractive impurity point defects complex defects infrafed spectroscopy |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | lithium niobate photorefractive impurity point defects complex defects infrafed spectroscopy |
| url | https://physchemaspects.ru/2024/doi-10-26456-pcascnn-2024-16-277/?lang=en |
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