Pub Date : 2024-03-07DOI: 10.1134/s1068337223040060
A. R. Balabekyan, G. H. Hovhannisyan, S. V. Gaginyan, G. M. Ayvazyan, H. G. Zohrabyan, V. H. Khachatryan, H. S. Vardanyan, A. T. Margaryan
Abstract
The article describes a new detector, a volume filled with hexane at low pressure (3 Torr), containing multi-wire proportional chambers and a silicon semiconductor detector. Using this setup, alpha particles emitted during the decay of the radioactive isotope 226Ra were detected. The device has an energy resolution of ≤ 5% and allows measuring the ionization energy losses of alpha particles as well. Thus, the LPMWPC and SSD-based experimental setup is a good tool for studying both binary and ternary fission of heavy nuclei, in which the third fragment is a high-energy alpha particle.
{"title":"Experimental Installation Based on LPMWPC and SSD Detectors for Registration and Identification of Alpha Particles and Fission Fragments","authors":"A. R. Balabekyan, G. H. Hovhannisyan, S. V. Gaginyan, G. M. Ayvazyan, H. G. Zohrabyan, V. H. Khachatryan, H. S. Vardanyan, A. T. Margaryan","doi":"10.1134/s1068337223040060","DOIUrl":"https://doi.org/10.1134/s1068337223040060","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article describes a new detector, a volume filled with hexane at low pressure (3 Torr), containing multi-wire proportional chambers and a silicon semiconductor detector. Using this setup, alpha particles emitted during the decay of the radioactive isotope <sup>226</sup>Ra were detected. The device has an energy resolution of ≤ 5% and allows measuring the ionization energy losses of alpha particles as well. Thus, the LPMWPC and SSD-based experimental setup is a good tool for studying both binary and ternary fission of heavy nuclei, in which the third fragment is a high-energy alpha particle.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-07DOI: 10.1134/s1068337223040059
G. Y. Ayvazyan
Abstract
The structural and optical properties of tandem silicon/perovskite structures with a hierarchical antireflective surface at the interface have been studied. The surface consisted of micro-sized pyramids and nano-sized short needles formed respectively by chemical and reactive ion etching of silicon substrates. It is shown that a perovskite film without pores and voids covers a hierarchical surface with high conformity. The manufactured samples are characterized by low reflectance over a wide range of radiation wavelengths.
{"title":"Hierarchical Antireflective Surface of Silicon Substrates for Tandem Solar Cells","authors":"G. Y. Ayvazyan","doi":"10.1134/s1068337223040059","DOIUrl":"https://doi.org/10.1134/s1068337223040059","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The structural and optical properties of tandem silicon/perovskite structures with a hierarchical antireflective surface at the interface have been studied. The surface consisted of micro-sized pyramids and nano-sized short needles formed respectively by chemical and reactive ion etching of silicon substrates. It is shown that a perovskite film without pores and voids covers a hierarchical surface with high conformity. The manufactured samples are characterized by low reflectance over a wide range of radiation wavelengths.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-07DOI: 10.1134/s1068337223040023
A. Y. Aleksanyan, S. M. Amirkhanyan, A. G. Aperyan, H. R. Gulkanyan, T. V. Kotanjyan, M. A. Levonyan, V. S. Pogosov, L. A. Poghosyan, A. S. Saakov, A. A. Shahinyan
Abstract
For the first time in Armenia, gamma activation analysis of geological samples of obsidian was carried out using beams of bremsstrahlung photons at the linear electron accelerator of the A. Alikhanyan National Scientific Laboratory (AANL). It is shown that the results of the chemical composition of the obsidian sample are comparable with the results of instrumental neutron activation analysis (INAA) of the same sample, carried out at the Curt-Engelhom-Center for Archaeometry (Mannheim, Germany), after irradiation with neutrons in a specialized nuclear reactor TRIGA at the Institute of Nuclear Chemistry of the Mainz University. It is also shown that gamma activation analysis makes it possible to determine the content of a number of elements for which the use of INAA is impossible or difficult.
{"title":"Comparison of Gamma Activation Analysis and Instrumental Neutron Activation Analysis of Geological Samples","authors":"A. Y. Aleksanyan, S. M. Amirkhanyan, A. G. Aperyan, H. R. Gulkanyan, T. V. Kotanjyan, M. A. Levonyan, V. S. Pogosov, L. A. Poghosyan, A. S. Saakov, A. A. Shahinyan","doi":"10.1134/s1068337223040023","DOIUrl":"https://doi.org/10.1134/s1068337223040023","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>For the first time in Armenia, gamma activation analysis of geological samples of obsidian was carried out using beams of bremsstrahlung photons at the linear electron accelerator of the A. Alikhanyan National Scientific Laboratory (AANL). It is shown that the results of the chemical composition of the obsidian sample are comparable with the results of instrumental neutron activation analysis (INAA) of the same sample, carried out at the Curt-Engelhom-Center for Archaeometry (Mannheim, Germany), after irradiation with neutrons in a specialized nuclear reactor TRIGA at the Institute of Nuclear Chemistry of the Mainz University. It is also shown that gamma activation analysis makes it possible to determine the content of a number of elements for which the use of INAA is impossible or difficult.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-07DOI: 10.1134/s1068337223040175
G. H. Shahkhatuni
Abstract
A sensor sensitive to hydrogen peroxide vapor based on Fe2O3:ZnO (80 : 20 wt %) nanostructured film was studied. Investigation of the Fe2O3:ZnO sensor has been carried out by impedance spectroscopy. Based on the analysis of the frequency dependences of the real and imaginary parts of the complex impedance, the equivalent electrical circuit for the studied sensor structure was proposed, the parameters of its constituent elements were estimated, and approximating curves were computed. Scanning electron microscopy (SEM) images of the Fe2O3:ZnO film showed a nanoparticle structure. This type of sensor can be used in alternating signal-based detectors for sensing the hydrogen peroxide vapors, at the same time the sensor must be tuned to achieve maximum sensitivity by selecting an appropriate operating frequency range.
{"title":"Investigation of Nanostructured Fe2O3:ZnO Sensor by Impedance Spectroscopy","authors":"G. H. Shahkhatuni","doi":"10.1134/s1068337223040175","DOIUrl":"https://doi.org/10.1134/s1068337223040175","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A sensor sensitive to hydrogen peroxide vapor based on Fe<sub>2</sub>O<sub>3</sub>:ZnO (80 : 20 wt %) nanostructured film was studied. Investigation of the Fe<sub>2</sub>O<sub>3</sub>:ZnO sensor has been carried out by impedance spectroscopy. Based on the analysis of the frequency dependences of the real and imaginary parts of the complex impedance, the equivalent electrical circuit for the studied sensor structure was proposed, the parameters of its constituent elements were estimated, and approximating curves were computed. Scanning electron microscopy (SEM) images of the Fe<sub>2</sub>O<sub>3</sub>:ZnO film showed a nanoparticle structure. This type of sensor can be used in alternating signal-based detectors for sensing the hydrogen peroxide vapors, at the same time the sensor must be tuned to achieve maximum sensitivity by selecting an appropriate operating frequency range.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-07DOI: 10.1134/s106833722304014x
M. A. Parsadanyan, M. A. Shahinyan, S. V. Grigoryan, M. S. Mikaelyan, G. H. Poghosyan, V. P. Kalantaryan, P. O. Vardevanyan
Abstract
The interaction of nutritional preservative and dye erythrosine B with bovine serum albumin (BSA) under the influence of millimeter range electromagnetic waves (MM EMW) with frequencies 41.8 and 51.8 GHz has been studied by the UV-denaturation and spectroscopic methods (absorption, fluorescence, and circular dichroism (CD)). We show that the irradiation by MM EMW with the frequency 51.8 GHz stabilizes the complex BSA-erythrosine B. At the same time, denaturation parameters of the complex at the irradiation of BSA solution with the frequency 41.8 GHz do not differ from those obtained for non-irradiated samples within the limits of experimental error. We also show that under the influence of the irradiation by 51.8 GHz frequency there is no conformational change of BSA. However, a change in the protein conformation takes place in the case of the complex BSA-erythrosine B. In addition, the complex-formation process is thermodynamically beneficial and implemented because of the additional hydrogen bonds and van-der-Waals interaction between BSA and erythrosine B under the influence of MM EMW.
摘要 在频率为 41.8 和 51.8 GHz 的毫米波电磁波（MM EMW）的影响下，通过紫外变性和光谱方法（吸收、荧光和圆二色性（CD））研究了营养防腐剂和染料赤藓红 B 与牛血清白蛋白（BSA）的相互作用。我们的研究结果表明，用频率为 51.8 GHz 的 MM EMW 对 BSA-erythrosine B 复合物进行辐照后，其变性参数在实验误差范围内与未辐照样品的变性参数没有差异。我们还发现，在 51.8 GHz 频率辐照的影响下，BSA 的构象没有发生变化。此外，在 MM EMW 的影响下，BSA 和赤藓红 B 之间产生了额外的氢键和范德华相互作用，因此复合体的形成过程在热力学上是有益的。
{"title":"Interaction of Serum Albumin with Erythrosine B under the Influence of Millimeter-Range Electromagnetic Waves","authors":"M. A. Parsadanyan, M. A. Shahinyan, S. V. Grigoryan, M. S. Mikaelyan, G. H. Poghosyan, V. P. Kalantaryan, P. O. Vardevanyan","doi":"10.1134/s106833722304014x","DOIUrl":"https://doi.org/10.1134/s106833722304014x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The interaction of nutritional preservative and dye erythrosine B with bovine serum albumin (BSA) under the influence of millimeter range electromagnetic waves (MM EMW) with frequencies 41.8 and 51.8 GHz has been studied by the UV-denaturation and spectroscopic methods (absorption, fluorescence, and circular dichroism (CD)). We show that the irradiation by MM EMW with the frequency 51.8 GHz stabilizes the complex BSA-erythrosine B. At the same time, denaturation parameters of the complex at the irradiation of BSA solution with the frequency 41.8 GHz do not differ from those obtained for non-irradiated samples within the limits of experimental error. We also show that under the influence of the irradiation by 51.8 GHz frequency there is no conformational change of BSA. However, a change in the protein conformation takes place in the case of the complex BSA-erythrosine B. In addition, the complex-formation process is thermodynamically beneficial and implemented because of the additional hydrogen bonds and van-der-Waals interaction between BSA and erythrosine B under the influence of MM EMW.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-07DOI: 10.1134/s1068337223040199
A. V. Yeganyan, N. E. Kokanyan, E. P. Kokanyan
Abstract
Within the frameworks of the defect isotopic model, new expressions for the rapid estimation of the absorption coefficients of longitudinal and transverse hypersonic waves in the alloyed lithium niobate single crystals in the Akhiezer regime have been obtained. It is shown that the introduction of impurities in the crystal results in a change in both the magnitude of the sound attenuation coefficient and its temperature dependence.
{"title":"Absorption of Hypersonic Waves in Doped Lithium Niobate Single Crystals","authors":"A. V. Yeganyan, N. E. Kokanyan, E. P. Kokanyan","doi":"10.1134/s1068337223040199","DOIUrl":"https://doi.org/10.1134/s1068337223040199","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Within the frameworks of the defect isotopic model, new expressions for the rapid estimation of the absorption coefficients of longitudinal and transverse hypersonic waves in the alloyed lithium niobate single crystals in the Akhiezer regime have been obtained. It is shown that the introduction of impurities in the crystal results in a change in both the magnitude of the sound attenuation coefficient and its temperature dependence.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-07DOI: 10.1134/s1068337223040072
M. K. Balyan
Abstract
Vector non-stationary diffraction electromagnetic fields and fields of charges in an arbitrarily chosen volume in both homogeneous and inhomogeneous media are considered. These formulas are presented in two forms, each of which has its advantages in applications. The generalization of the Kirchhoff–Kottler vector formulas for discontinuous fields in the non-stationary case is also directly obtained.
{"title":"Vector Non-Stationary Electromagnetic Diffraction Fields and Fields of Charges in Media","authors":"M. K. Balyan","doi":"10.1134/s1068337223040072","DOIUrl":"https://doi.org/10.1134/s1068337223040072","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Vector non-stationary diffraction electromagnetic fields and fields of charges in an arbitrarily chosen volume in both homogeneous and inhomogeneous media are considered. These formulas are presented in two forms, each of which has its advantages in applications. The generalization of the Kirchhoff–Kottler vector formulas for discontinuous fields in the non-stationary case is also directly obtained.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-26DOI: 10.1134/s1068337223030167
A. H. Stepanyan
Abstract
The electrically small phased antenna array is investigated. High permittivity dielectric and magnetodielectric materials (MDM) are used for antenna array substrates to miniaturize antenna size. To analyze material parameter influence on antenna performance, the same refractive index is considered for dielectric and MDM. The basic parameters of high permittivity-based, and MDM-based microstrip patch antenna arrays are compared. The simulation results show that the usage of MDM results in the improvement in bandwidth and isolation between elements, perfect impedance matching (voltage standing wave ratio (VSWR) < (~1.1) for center frequency) between material and free space over a much wider bandwidth.
{"title":"Bandwidth Increase and Isolation Improvement of Elements in Miniaturized Phased Antenna Array","authors":"A. H. Stepanyan","doi":"10.1134/s1068337223030167","DOIUrl":"https://doi.org/10.1134/s1068337223030167","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Th<b>e</b> electrically small phased antenna array is investigated. High permittivity dielectric and magnetodielectric materials (MDM) are used for antenna array substrates to miniaturize antenna size. To analyze material parameter influence on antenna performance, the same refractive index is considered for dielectric and MDM. The basic parameters of high permittivity-based, and MDM-based microstrip patch antenna arrays are compared. The simulation results show that the usage of MDM results in the improvement in bandwidth and isolation between elements, perfect impedance matching (voltage standing wave ratio (VSWR) < <span>(~1.1)</span> for center frequency) between material and free space over a much wider bandwidth.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-26DOI: 10.1134/s1068337223030118
H. T. Gyulasaryan
Abstract
The magnetic size effects of single-domain nickel nanoparticles encapsulated in a graphite-like carbon shell (Ni@C nanocomposites) have been studied. Along with ferro- and superparamagnetic characteristics, the samples exhibit paramagnetism due to surface nickel ions formed through charge transfer from the carbon matrix. A detailed analysis of the total curves of magnetization M(H) and coercivity at 10 K was carried out and the corresponding magnetic parameters were determined.
摘要 研究了包裹在类石墨碳壳（Ni@C 纳米复合材料）中的单域镍纳米粒子的磁尺寸效应。除了铁磁性和超顺磁性之外，样品还表现出顺磁性，这是由于表面镍离子通过碳基体的电荷转移形成的。对 10 K 时的磁化总曲线 M(H) 和矫顽力进行了详细分析，并确定了相应的磁参数。
{"title":"Analysis of the Magnetic Characteristics of Single-Domain Ferromagnetic and Superparamagnetic Nanoparticles in a Ni@C Nanocomposite","authors":"H. T. Gyulasaryan","doi":"10.1134/s1068337223030118","DOIUrl":"https://doi.org/10.1134/s1068337223030118","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The magnetic size effects of single-domain nickel nanoparticles encapsulated in a graphite-like carbon shell (Ni@C nanocomposites) have been studied. Along with ferro- and superparamagnetic characteristics, the samples exhibit paramagnetism due to surface nickel ions formed through charge transfer from the carbon matrix. A detailed analysis of the total curves of magnetization <i>M</i>(<i>H</i>) and coercivity at 10 K was carried out and the corresponding magnetic parameters were determined.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-26DOI: 10.1134/s1068337223030088
M. V. Derdzyan, K. L. Hovhannesyan, A. V. Yeganyan, I. Ghambaryan, G. Badalyan, K. N. Gorbachenya, V. E. Kisel, N. V. Kuleshov, A. G. Petrosyan
Abstract
Single crystals of YAlO3-Er (YAP:Er) are grown by the Bridgman method from melts with different Y/Al ratio. The structural defects and color centers are compared for Y/Al = 1 and Y/Al > 1, as well as formed in the processes of gamma-irradiation and thermal treatment. Based on the obtained data, the growth conditions of YAP:Er crystals free of color centers and twins are determined. Spectral-luminescent properties of crystals are investigated: the absorption and luminescent spectra are registered in the polarized light, the luminescence kinetics is investigated and the lifetime of the 4I13/2 level of Er3+ ion is determined.
{"title":"Single Crystals of YAlO3:Er for 1.6 μm Spectral Range Lasers","authors":"M. V. Derdzyan, K. L. Hovhannesyan, A. V. Yeganyan, I. Ghambaryan, G. Badalyan, K. N. Gorbachenya, V. E. Kisel, N. V. Kuleshov, A. G. Petrosyan","doi":"10.1134/s1068337223030088","DOIUrl":"https://doi.org/10.1134/s1068337223030088","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Single crystals of YAlO<sub>3</sub>-Er (YAP:Er) are grown by the Bridgman method from melts with different Y/Al ratio. The structural defects and color centers are compared for Y/Al = 1 and Y/Al > 1, as well as formed in the processes of gamma-irradiation and thermal treatment. Based on the obtained data, the growth conditions of YAP:Er crystals free of color centers and twins are determined. Spectral-luminescent properties of crystals are investigated: the absorption and luminescent spectra are registered in the polarized light, the luminescence kinetics is investigated and the lifetime of the <sup>4</sup><i>I</i><sub>13/2</sub> level of Er<sup>3+</sup> ion is determined.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139054059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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