{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T18:14:51Z","timestamp":1790014491679,"version":"4.0.1"},"reference-count":97,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T00:00:00Z","timestamp":1789948800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Ministry of Science and Higher Education Russian Federation scientific topic","award":["FMEZ-2025-0055"],"award-info":[{"award-number":["FMEZ-2025-0055"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>The macro- and microstructures of LiNbO3:Tb3+(2.25 wt%) and LiNbO3:Tb3+(2.9 wt%) crystals were studied. It was shown that a slight increase in terbium content dramatically alters the growth domain structure and enhances fractal self-organization. The defect structure features of LiNbO3:Tb3+(2.25 wt%) and LiNbO3:Tb3+(2.9 wt%) single-crystal plates with an after-threshold terbium concentration were studied using optical absorption spectra, Raman scattering spectra in the frequency range of 65\u20134000 cm\u22121, and IR absorption spectra in the frequency range of 1000\u20138000 cm\u22121. It was shown that the LiNbO3:Tb3+(2.25 wt%) plate has a lower concentration of NbLi point defects and a higher stoichiometry compared to the LiNbO3:Tb3+(2.9 wt%) plate. A good match was found between the Raman spectra of the LiNbO3:Tb3+(2.25 wt%) and LiNbO3:Tb3+(2.9 wt%) plates throughout the entire studied range. A significant difference was found in the frequencies of the lines corresponding to stretching vibrations of OH\u2212-groups in the vibrational spectra of the studied plates. This observation is explained by the fact that OH\u2212-groups in the LiNbO3 crystal structure are defects, and, therefore, the stretching vibrations of OH\u2212-groups are not fundamental lattice vibrations. The existing selection rules for fundamental lattice vibrations, developed on the basis of group theory, do not apply to the defect sublattice.<\/jats:p>","DOI":"10.3390\/ma19184021","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T17:23:17Z","timestamp":1790011397000},"page":"4021","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Optical Properties and Defects of Single-Crystal LiNbO3:Tb3+ Plates with a Post-Threshold Concentration of Terbium Ions"],"prefix":"10.3390","volume":"19","author":[{"given":"Nikolay V.","family":"Sidorov","sequence":"first","affiliation":[{"name":"Tananaev Institute of Chemistry\u2014Subdivision of the Federal Research Centre, Kola Science Centre of the Russian Academy of Sciences (ICT RAS), 184209 Apatity, Russia"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9686-0563","authenticated-orcid":false,"given":"Mikhail N.","family":"Palatnikov","sequence":"additional","affiliation":[{"name":"Tananaev Institute of Chemistry\u2014Subdivision of the Federal Research Centre, Kola Science Centre of the Russian Academy of Sciences (ICT RAS), 184209 Apatity, Russia"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2279-7079","authenticated-orcid":false,"given":"Alexander V.","family":"Skrabatun","sequence":"additional","affiliation":[{"name":"P. 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Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russia"},{"name":"Department of Physics and Technical Mechanics, MIREA\u2014Russian Technological University, 119454 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5367-295X","authenticated-orcid":false,"given":"Lyubov A.","family":"Bobreva","sequence":"additional","affiliation":[{"name":"Tananaev Institute of Chemistry\u2014Subdivision of the Federal Research Centre, Kola Science Centre of the Russian Academy of Sciences (ICT RAS), 184209 Apatity, Russia"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7907-623X","authenticated-orcid":false,"given":"Roman A.","family":"Titov","sequence":"additional","affiliation":[{"name":"Tananaev Institute of Chemistry\u2014Subdivision of the Federal Research Centre, Kola Science Centre of the Russian Academy of Sciences (ICT RAS), 184209 Apatity, Russia"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"formal-analysis","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3310-8830","authenticated-orcid":false,"given":"Olga V.","family":"Palatnikova","sequence":"additional","affiliation":[{"name":"Tananaev Institute of Chemistry\u2014Subdivision of the Federal Research Centre, Kola Science Centre of the Russian Academy of Sciences (ICT RAS), 184209 Apatity, Russia"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-7762-8363","authenticated-orcid":false,"given":"Oleg A.","family":"Klimenko","sequence":"additional","affiliation":[{"name":"P. 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