Optical Materials: X最新文献

{"title":"Application of ion modification for alteration of anode materials based on ZnO/CoZn nanostructures","authors":"Ainur M. Zikirina ,&nbsp;Artem L. Kozlovskiy ,&nbsp;Inesh E. Kenzhina","doi":"10.1016/j.omx.2024.100374","DOIUrl":"10.1016/j.omx.2024.100374","url":null,"abstract":"<div><div>During the conducted studies, it was established that the use of ion modification by irradiation with O⁺ and Ar⁺ ions makes it possible to elevate the degradation resistance of anode materials due to the effect of vacancy defect creation, the density of which varies with the irradiation fluence. At the same time, the analysis of changes in the band gap and the optical density value, expressing changes in structural distortions, revealed that ion irradiation leads to a rise in the stability of the preservation of electronic properties during long-term resource tests, which are inextricably linked with the degradation of ZnO/CoZn nanostructures due to oxidation processes as a result of lithiation. During assessment of changes in the parameters of the band gap and optical density of the samples after resource tests, it was found that the observed growth in these indicators is due to oxidation processes and partial amorphization due to the formation of oxide inclusions in the structure of nanowires, the presence of which is due to the interaction of nanostructures with the electrolyte over a long period of time during charging/discharging, which results in near-surface layer degradation due to the introduction of oxygen, and in the case of a long service life, to the formation of oxide inclusions that elevate the density of defects and vacancies in the structure. According to tests of synthesized ZnO/CoZn nanostructures as anode materials, it was found that the use of O⁺ and Ar⁺ ions not only leads to a growth in the degradation resistance of capacitive characteristics during long-term tests, but also to the stability maintenance of indicators with a reversible decrease in the charging rate at charging rate variation.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100374"},"PeriodicalIF":0.0,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142535314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Review of thermal neutron scintillators: Evaluation metrics and future prospects for demanding applications","authors":"G. Jeff Sykora,&nbsp;Sarah E. Mann,&nbsp;Giacomo Mauri,&nbsp;Erik M. Schooneveld,&nbsp;Nigel J. Rhodes","doi":"10.1016/j.omx.2024.100373","DOIUrl":"10.1016/j.omx.2024.100373","url":null,"abstract":"<div><div>Neutron applications are progressing rapidly, requiring detectors to meet increasingly rigorous criteria. Specifications such as high neutron counting rates, fast timing resolution and low background have a significant impact on choice of scintillator and how scintillators are evaluated. This work considers detector requirements for neutron scattering instruments that are becoming more stringent as the sources and scattering technologies continue to improve. Meanwhile, both prominent scintillators used for neutron scattering detectors, ZnS:Ag/⁶LiF and GS-glass, remain stagnant. While these scintillators have been suitable for many years, they are becoming a limiting factor for neutron scattering instruments. ZnS:Ag is inhibiting count rate capability and GS-glass is too gamma sensitive so alternatives need to be found. A brief explanation of neutron scattering, its detector requirements and how those relate to scintillator properties will be discussed. Furthermore, this work explains how standard characterization methods and reporting of scintillation properties are not entirely suitable for high count rate, low background applications like neutron scattering. As a result, modifications to characterization of gamma discrimination, light output, and decay kinetics are suggested. Additional steps are suggested including neutron activation and a more appropriate assessment of count rate capability. A non-exhaustive set of ⁶Li containing neutron sensitive scintillators including ZnS:Ag/⁶LiF, GS20 glass, ZnO:Zn/⁶LiF, Cs⁶LiYCl:Ce, ⁶LiI:Eu, ⁶LiI:Ce, ⁶LiCaAlF:Eu, LiCaAlF:Ce, transparent rubber sheet (TRUST) ⁶LiCaAlF:Eu, TRUST ⁶LiCaAlF:Eu with added fluorophore and EJ-270 (⁶Li containing plastic) are reviewed and studied from this different perspective. Finally, new scintillator developments relevant to high count rate, low background applications are discussed.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100373"},"PeriodicalIF":0.0,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142535315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scintillation properties of multilayered composite scintillators based on the YAG:Ce and TbAG:Ce single crystalline films and GAGG:Ce crystal substrates","authors":"Y. Syrotych ,&nbsp;V. Gorbenko ,&nbsp;S. Witkiewicz-Łukaszek ,&nbsp;T. Zorenko ,&nbsp;M. Kaczmarek ,&nbsp;J. Pejchal ,&nbsp;J.A. Mares ,&nbsp;R. Kucerkova ,&nbsp;M. Nikl ,&nbsp;K. Kamada ,&nbsp;A. Yoshikawa ,&nbsp;Yu Zorenko","doi":"10.1016/j.omx.2024.100372","DOIUrl":"10.1016/j.omx.2024.100372","url":null,"abstract":"<div><div>This work demonstrates current progress of our group in developing of two- and three-layered composite for radiation monitoring of various components of mixed ionization radiation fluxes based on the epitaxial structures of Ce³⁺ doped garnet compounds using the Liquid Phase Epitaxy growth technique. These scintillators contain one or two single crystalline films, dedicated for registration of low-penetrating particles, and bulk single crystal substrates used for detection of high-penetrating γ-rays. For creation of two- and three-layered epitaxial structures, the single crystalline films of Ce³⁺ doped Y₃Al₅O₁₂, Tb₃Al₅O₁₂ and Tb₂GdAl₅O₁₂ garnets were used. The single crystal of mixed Gd₃Ga_xAl_5-xO₁₂:Ce garnet with fixed Ga concentrations of x = 2.3 and 3.0 are utilized as substrates. To assess the scintillation properties of these epitaxial structures, the pulse height spectra, light yield and scintillation decay kinetics were measured under excitation by α–particles (²³⁹Pu), β-particles (⁹⁰Sr + ⁹⁰Y) and γ–rays (¹³⁷Cs). Finally, the figure-of merit of composite scintillators under study were calculated for selection of the best epitaxial structures for simultaneous registration α– and β-particles and γ–rays.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100372"},"PeriodicalIF":0.0,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unusually high oxidation states of manganese in high optical basicity silicate glasses","authors":"Amir Ashjari ,&nbsp;Brian Topper ,&nbsp;Lars H. Hess ,&nbsp;Lucas Greiner ,&nbsp;Jared Tolliver ,&nbsp;Fiona Cormack ,&nbsp;Dimitrios Palles ,&nbsp;Efstratios I. Kamitsos ,&nbsp;Mikhail G. Brik ,&nbsp;Doris Möncke","doi":"10.1016/j.omx.2024.100371","DOIUrl":"10.1016/j.omx.2024.100371","url":null,"abstract":"<div><div>Unusually high oxidation states of manganese were stabilized within a cesium-barium silicate (CBS) glass system of extremely high optical basicity. The highest basicity was obtained for the metasilicate glass 40Cs₂O–10BaO–50SiO₂ (mol%) with an optical basicity of <span><math><mrow><mi>Λ</mi></mrow></math></span> = 0.81. The presence of Mn⁵⁺ (d²) as well as Mn⁶⁺ (d¹) is confirmed by UV–Vis, photoluminescence, and Raman spectroscopy. The UV–Vis spectrum is dominated by the Mn³⁺ (d⁴) absorption at 526 nm for low-basicity glasses, which is replaced by a peak at 679 nm (Mn⁵⁺) and, finally, a band at 603 nm (Mn⁶⁺) in the glass with the highest basicity (<span><math><mrow><mi>Λ</mi></mrow></math></span> = 0.81). In this glass, the Mn⁵⁺/Mn⁶⁺ ratio varies with the melting conditions. Photoluminescence (PL) spectroscopy under 633 nm excitation confirms the presence of Mn⁵⁺, showing the narrow, forbidden ¹E <span><math><mrow><mo>→</mo></mrow></math></span>³A₂ transition located at 1191 nm with vibrational sidebands at 1245 nm and 1290 nm. The measured static fluorescence intensity due to Mn⁵⁺ grows exponentially with increasing optical basicity. The near infrared fluorescence decay was bi-exponential, with time constants of 14 and 51 μs. The absence of Mn⁴⁺ in CBS glasses was confirmed by PL and electron paramagnetic resonance (EPR) spectroscopy. Despite initial doping as MnO₂, metastable Mn⁴⁺ disproportionates into lower and higher valent manganese species, followed by reduction or oxidation of manganese to a stable species as ruled by the basicity of the glass and oxygen availability during melting. A structural study of the glasses by Raman spectroscopy revealed a resonance enhancement effect for the symmetric stretching mode of MnO₄-tetrahedra at ∼800 cm⁻¹ with overtones observed at higher frequencies.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100371"},"PeriodicalIF":0.0,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142419455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ZnYbAgO nanoparticles for the photocatalytic degradation","authors":"Trinh Duc Thien ,&nbsp;Nguyen Van Thang ,&nbsp;Le T.M. Cham ,&nbsp;Nguyen Dinh Lam","doi":"10.1016/j.omx.2024.100370","DOIUrl":"10.1016/j.omx.2024.100370","url":null,"abstract":"<div><div>The co-precipitation technique was used to produce Zn_1-x-yYb_xAg_yO nanomaterials. The Zn_1-x-yYb_xAg_yO nanomaterials have higher photocatalytic activity compared to ZnO, owing to their exceptional optical and electrical characteristics. The results demonstrate that the Zn_0.096Yb_0.02Ag_0.02O nanoparticles are capable of decomposing 98.2 % of RhB dye after 15 min by photodegradation. Moreover, studies have shown that superoxide radicals actively participate in the process of photodegradation.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100370"},"PeriodicalIF":0.0,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142419611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of dicarboxystilbene impurities on the properties of swift heavy ion latent tracks in PET films","authors":"Adil Z. Tuleushev ,&nbsp;Fiona E. Harrison ,&nbsp;Artem L. Kozlovskiy ,&nbsp;Maxim V. Zdorovets","doi":"10.1016/j.omx.2024.100369","DOIUrl":"10.1016/j.omx.2024.100369","url":null,"abstract":"<div><div>We present a new hypothesis and supporting experimental evidence about the essential role played by small impurities of dicarboxystilbene in the process of UV treatment of PET films irradiated with swift heavy ions (SHI). This treatment both forms highly selective membranes with permeability values comparable to natural ones (the track-UV technique) and sharply accelerates the etching of latent tracks in membrane production (the track-etching technique). We hypothesize (1) that these high permeability value is due to the presence of a molecular motor of an Archimedes screw type in the central part of the latent track formed by photoinduced <em>trans-cis</em> isomerization of dicarboxystilbene molecules that are anchored in helical conformations in the latent track; and (2) that the acceleration of etching rates is due to the preferential accumulation of phenanthrene-type molecules in the central part of the latent track due to the existence of a cyclization channel for photoexcited molecules of <em>cis</em>-dicarboxystilbene. In the presence of alkali solution, phenanthrene molecules release electrons which behave as strong anions in aqueous solution, catalyzing alkaline hydrolysis of PET molecules in the central part of the track. We present experimental observations of photoinduced changes in transmission light intensity after track-UV light treatment of both pristine and SHI irradiated PET films that confirm the presence of <em>trans-cis</em> isomerization of dicarboxystilbene molecules and show their contribution to the formation of new helical conformations in SHI irradiated PET films during the light treatment.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100369"},"PeriodicalIF":0.0,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142419456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of the applicability of ACdSe (A – Co, Ni) thin films as catalysts for heavy metal capture","authors":"Aliya Zh Omarova ,&nbsp;Artem L. Kozlovskiy ,&nbsp;Gulnaz Zh Moldabayeva","doi":"10.1016/j.omx.2024.100366","DOIUrl":"10.1016/j.omx.2024.100366","url":null,"abstract":"<div><div>Expansion of the possibilities of using photoactive thin films with a unique combination of optical and morphological characteristics as a basis for creation of highly efficient catalysts for the aqueous media purification is one of the promising research areas in modern materials science, which has both fundamental significance and potential for practical application. This study examines the prospects for using modified thin CdSe films by substituting nickel or cobalt for cadmium and selenium as a basis for creating highly efficient catalysts for the aqueous media purification from heavy metals such as arsenic, manganese and iron. A rather inexpensive electrochemical synthesis method was proposed as a method for obtaining thin films, in which the substitution effect is achieved by addition of nickel or cobalt sulfates to the electrolyte, which allows obtaining films with an equally probable distribution of elements in the composition of the synthesized films. Optical spectroscopy methods were used as methods for characterization of the initial samples, which made it possible to establish the dependences of the change in the band gap and absorption bands on the composition of the synthesized films, as well as to anticipate the influence of morphological features on optical absorption. During the conducted studies it was established that partial substitution of nickel and cobalt for cadmium and selenium in the composition of films results in growth in the adsorption efficiency of heavy metals, alongside operation stability maintenance of modified films during cyclic tests. At the same time, enhancement of the adsorption efficiency of heavy metals for modified films is due to both an alteration in the optical properties of the films and morphological features associated with the specific surface area growth due to a reduction in the grain size and a more developed surface.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100366"},"PeriodicalIF":0.0,"publicationDate":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142356639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical properties of SiO2 opal crystals decorated with silver nanoparticles","authors":"Nguyen Duy Thien ,&nbsp;Tu Nguyen Ngoc ,&nbsp;Sai Cong Doanh ,&nbsp;Vuong Van Hiep ,&nbsp;Le Quang Thao ,&nbsp;Luu Manh Quynh ,&nbsp;Le Viet Cuong ,&nbsp;Nguyen Huy Tiep ,&nbsp;Duc Thang Pham ,&nbsp;Hoang Nam Nhat ,&nbsp;Ngoc Dinh Nguyen","doi":"10.1016/j.omx.2024.100362","DOIUrl":"10.1016/j.omx.2024.100362","url":null,"abstract":"<div><div>SiO₂ opal crystals decorated with silver nanoparticles (AgNPs) have been successfully fabricated. SEM analysis revealed that the SiO₂ opals have an ordered region of 25–30 μm², and AgNPs are located into the gaps between the SiO₂ nanospheres. The effect of the plasmons of AgNPs on the photoluminescence of SiO₂ opal crystals were investigated. Under excitation of a 325 nm laser, we observed the quenching of the intrinsic defect emission in SiO₂ as the concentration of AgNPs increased. The cause of the observed photoluminescence behavior is attributed to the interaction between surface plasmon induced by AgNPs and photoluminescence centers in SiO₂ opal crystals. Then, we utilized SiO₂ opals crystals decorated with AgNPs as a SERS substrate. The final enhancement factor of the Raman shift was 1.64 × 10⁷, enabling the trace detection limit for a case of malachite green to be as low as 0.05 ppm, with a relative standard deviation of less than 1.75 %. This outcome suggests the potential for direct application of the prepared substrates in ultra-fast chemical analysis.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100362"},"PeriodicalIF":0.0,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142419612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spectroscopy, crystal-field, and transition intensity analyses of the C3v(O2−) centre in Er3+ doped CaF2 crystals","authors":"M.D. Moull ,&nbsp;J.B.L. Martin ,&nbsp;T.G.M. Newman ,&nbsp;A.L. Jeffery ,&nbsp;J.G. Bartholomew ,&nbsp;J.-P.R. Wells ,&nbsp;M.F. Reid","doi":"10.1016/j.omx.2024.100365","DOIUrl":"10.1016/j.omx.2024.100365","url":null,"abstract":"<div><div>Erbium ions in crystals show considerable promise for the technologies that will form the backbone of future networked quantum information technology. Despite advances in leveraging erbium’s fibre-compatible infrared transition for classical and quantum applications, the transitions are, in general, not well understood. We present detailed absorption and laser site-selective spectroscopy of the C<span><math><msub><mrow></mrow><mrow><mi>3v</mi></mrow></msub></math></span>(O<span><math><msup><mrow></mrow><mrow><mn>2</mn><mo>−</mo></mrow></msup></math></span>) centre in CaF<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>:Er<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> as an interesting erbium site case study. The ⁴I<span><math><msub><mrow></mrow><mrow><mn>15</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span>Z<span><math><mrow><msub><mrow></mrow><mrow><mn>1</mn></mrow></msub><msup><mrow><mo>→</mo></mrow><mrow><mn>4</mn></mrow></msup></mrow></math></span>I<span><math><msub><mrow></mrow><mrow><mn>13</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span>Y<span><math><msub><mrow></mrow><mrow><mn>1</mn></mrow></msub></math></span> transition has a low-temperature inhomogeneous linewidth of 1 GHz with hyperfine structure observable from the ¹⁶⁷Er isotope. A parametrized crystal-field Hamiltonian is fitted to 34 energy levels and the two ground state magnetic splitting factors. The wavefunctions are used to perform a transition intensity analysis and electric-dipole parameters are fitted to absorption oscillator strengths. Simulated spectra for the ⁴I<span><math><mrow><msub><mrow></mrow><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow></msub><msup><mrow><mo>→</mo></mrow><mrow><mn>4</mn></mrow></msup></mrow></math></span>I<span><math><msub><mrow></mrow><mrow><mn>15</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> and ⁴I<span><math><mrow><msub><mrow></mrow><mrow><mn>13</mn><mo>/</mo><mn>2</mn></mrow></msub><msup><mrow><mo>→</mo></mrow><mrow><mn>4</mn></mrow></msup></mrow></math></span>I<span><math><msub><mrow></mrow><mrow><mn>15</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> inter-multiplet transitions are in excellent agreement with the experimentally measured spectra. The ⁴I<span><math><msub><mrow></mrow><mrow><mn>13</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> excited state lifetime is 25.0<!--> <!-->ms and the intensity calculation is in excellent agreement with this value.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100365"},"PeriodicalIF":0.0,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142419613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The connection between the accumulation of structural defects caused by proton irradiation and the destruction of the near-surface layer of Li4SiO4 – Li2TiO3 ceramics","authors":"Inesh E. Kenzhina ,&nbsp;Artem L. Kozlovskiy ,&nbsp;Aktolkyn Tolenova ,&nbsp;Meiram Begentayev ,&nbsp;Saulet Askerbekov","doi":"10.1016/j.omx.2024.100367","DOIUrl":"10.1016/j.omx.2024.100367","url":null,"abstract":"<div><div>The key problem of using lithium-containing ceramics as materials of breeders for the propagation of tritium in thermonuclear reactors is phase stability, as well as the preservation of strength and thermophysical parameters of ceramics during their operation, which is accompanied by the accumulation of fission products in the near-surface layers, alongside mechanical influences from the outside. Moreover, in contrast to other types of ceramics, the presence of lithium in the composition of the samples under study leads to limitations in the use of classical analysis methods (scanning electron microscopy, energy dispersive analysis or optical spectroscopy) of structural changes caused by the accumulation of radiation damage, which requires the use of more complex methods for the assessment of the defect concentration in the structure, as well as establishing their relationship with the deterioration of strength and thermophysical parameters, playing a key role in determining the stability mechanisms and further exploitation of ceramics for tritium production. In this regard, the aim of the study is to determine the kinetics of changes in the near-surface layer of two-phase Li₄SiO₄ – Li₂TiO₃ ceramics associated with the accumulation of structural distortions caused by irradiation, as well as their relationship with strain embrittlement and disorder. During the studies, it was found that the accumulation of implanted hydrogen in the near-surface layer under high-dose irradiation initiates deformation distortion processes, the intensity of which depends on the ratio of components in the ceramics, according to which the optimal compositions of two-phase ceramics are ratios of components from 0.3 to 0.6. Determination of the type of defects in the composition of the damaged layer, as well as their concentration, was carried out using the electron spin resonance (ESP) method. During the studies, it was found that at low irradiation fluences, the dominant role in the accumulation of structural defects is played by vacancy defects associated with E′-centers, the formation of which is associated with structural distortions, while as the fluence grows, the structure is dominated by deformation disordering caused by the accumulation of Ti³⁺ defects and HC₂ centers (SiO₄ ^3-), the concentrations of which have a clear dependence on the phase composition of the ceramics.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100367"},"PeriodicalIF":0.0,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142356638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}