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Study of the Effect of Dopant Concentration on the Optical Uniformity and Photorefractive Properties of LiNbO3:Er:Zn Single Crystals 掺杂浓度对 LiNbO3:Er:Zn 单晶的光学均匀性和光折射特性的影响研究
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070089
I. V. Biryukova, R. A. Titov, N. A. Teplyakova, I. N. Efremov, M. N. Palatnikov
{"title":"Study of the Effect of Dopant Concentration on the Optical Uniformity and Photorefractive Properties of LiNbO3:Er:Zn Single Crystals","authors":"I. V. Biryukova,&nbsp;R. A. Titov,&nbsp;N. A. Teplyakova,&nbsp;I. N. Efremov,&nbsp;M. N. Palatnikov","doi":"10.1134/S1063784224070089","DOIUrl":"10.1134/S1063784224070089","url":null,"abstract":"<div><p>The physicochemical characteristics, optical uniformity and photorefractive properties of a series of four LiNbO<sub>3</sub>:Er:Zn single crystals have been studied. Single crystals have been obtained by the Czochralski method. The erbium content in the crystals was ~0.5 mol % and the zinc content in the crystals was ~4.02, 4.41, 4.65, 4.66 mol %. The dopant distribution in the LiNbO<sub>3</sub>:Er:Zn melt—crystal system has been studied, and the optimal concentration ranges of erbium and zinc in the initial melt have been determined. The ranges provide crystals with high chemical, optical uniformity and resistance to optical damage for applications in optoelectronics and laser technology.</p></div>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"1912 - 1920"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414620","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}
引用次数: 0
Statistical Evaluation of the Characteristics of Damaged Solar Panels of Spacecraft 航天器受损太阳能电池板特征的统计评估
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070016
A. A. Abdurahimov, A. V. Levandovich
{"title":"Statistical Evaluation of the Characteristics of Damaged Solar Panels of Spacecraft","authors":"A. A. Abdurahimov,&nbsp;A. V. Levandovich","doi":"10.1134/S1063784224070016","DOIUrl":"10.1134/S1063784224070016","url":null,"abstract":"<p>The change in the characteristics of a solar battery as a result of a random abrupt change in the properties of individual solar cells, which occurred as a result of a single or systematic impact of adverse factors in near-Earth outer space, is considered. The choice of the calculation scheme for constructing a model of a single solar cell is substantiated. For this situation, analytical mathematical models of typical connections of solar cells have been developed. Using the developed models, the current-voltage and volt-watt characteristics of the solar battery are analyzed in the case of an abrupt decrease in the photocurrent of solar cells with different probabilities. A statistical analysis of the characteristics of damaged solar cells was carried out using simplified logical-analytical models with the introduced circuit loss coefficient. Estimates of the values of the coefficient of circuit losses for typical schemes for connecting solar cells are given.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"1871 - 1877"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414466","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}
引用次数: 0
Changing the Parameters of Vacancy Formation and Self-Diffusion in Various Polymorphic Modifications of Iron 改变铁的各种多晶体改性中的空位形成和自扩散参数
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070259
M. N. Magomedov
{"title":"Changing the Parameters of Vacancy Formation and Self-Diffusion in Various Polymorphic Modifications of Iron","authors":"M. N. Magomedov","doi":"10.1134/S1063784224070259","DOIUrl":"10.1134/S1063784224070259","url":null,"abstract":"<p>The activation parameters for various iron structures were calculated by the analytical method based on the paired four-parameter Mie–Lennard-Jones interatomic interaction potential. Within the framework of a single method, all the activation processes parameters were calculated: Gibbs energy, enthalpy, entropy and volume for both the process of electroneutral vacancy formation and for the process of atom self-diffusion. The isobaric temperature dependences of the indicated activation parameters for BCC and FCC iron structures from <i>T</i> = 10 to 1810 K along two isobars: <i>P</i> = 0 and 10 GPa were calculated. It is shown that at the α–γ transition temperature (1184 K), the activation parameters decrease during the isobaric transition from the BCC to the FCC structure. At the γ–δ transition temperature (1667 K), the activation parameters increase during the transition from the FCC to the BCC structure. With increasing pressure, the jumps magnitude for the Gibbs energy and the enthalpy of the activation process increases, and for the entropy and volume of the activation process decreases. It is shown that, at low temperatures, due to quantum regularities, activation parameters strongly depend on temperature, and the entropy of activation processes in this region is negative. In the high temperature region, a good agreement has been obtained with the experimental estimates of activation parameters for different iron structures known from the literature.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"2024 - 2032"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414497","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}
引用次数: 0
Investigation of the Magnetic-Impedance Properties of CuO Nanoparticles Obtained in a Low-Pressure Arc Discharge Plasma 研究在低压电弧放电等离子体中获得的氧化铜纳米粒子的磁感应特性
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S106378422407048X
A. V. Ushackov, L. Yu. Fedorov
{"title":"Investigation of the Magnetic-Impedance Properties of CuO Nanoparticles Obtained in a Low-Pressure Arc Discharge Plasma","authors":"A. V. Ushackov,&nbsp;L. Yu. Fedorov","doi":"10.1134/S106378422407048X","DOIUrl":"10.1134/S106378422407048X","url":null,"abstract":"<p>CuO nanoparticles obtained in a low-pressure arc discharge plasma followed by annealing in an oxygen atmosphere at 500°C were studied by X-ray diffraction and transmission electron microscopy. The formation of irregularly shaped nanoparticles in the size range of 5–30 nm was found. The Rietveld refinement confirmed the formation of a monoclinic CuO phase with an average crystallite size of ~21 nm. The temperature dependences of the magnetization and permittivity of CuO nanoparticles have been studied. They show antiferromagnetic behavior with a Neel temperature of 230 K and frequency-dependent dispersion behavior in the temperature range of 100–200 K at an external magnetic field induction of 0–1.3 T. The dielectric relaxation mechanism is analyzed and found to follow the Arrhenius behavior. It is shown that hopping conductivity with a variable hop length more accurately describes charge transport in CuO nanoparticles. A magnetodielectric response of about 2.5 was observed at a frequency of 12 kHz at a temperature of 150 K in a magnetic field of 1.3 T.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"2163 - 2169"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414567","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}
引用次数: 0
On the 36-Year Cycle in Solar Activity 关于太阳活动的 36 年周期
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070338
M. G. Ogurtsov
{"title":"On the 36-Year Cycle in Solar Activity","authors":"M. G. Ogurtsov","doi":"10.1134/S1063784224070338","DOIUrl":"10.1134/S1063784224070338","url":null,"abstract":"<p>A series of data on the flux of cosmogenic <sup>10</sup>Be in an ice core recovered from Fuji Dome Station (East Antarctica) covering the period 700–1876 was analyzed. Fourier analysis and wavelet analysis showed the presence of cyclicity in this series with a period of about 36 yr. Since flux of <sup>10</sup>B contains information about variations in cosmic radiation entering the Earth’s atmosphere, mainly associated with changes in solar activity, the identified periodicity may be the result of the corresponding solar cycle. The possible climatic origin of the 36-year variation is also discussed.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"2071 - 2073"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414502","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}
引用次数: 0
Effect of Annealing and Additional Deformation on the Dynamic Properties of Ultrafine-Grained AMg4.5 Alloy 退火和附加变形对超细晶粒 AMg4.5 合金动态特性的影响
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070132
A. D. Evstifeev, E. Yu. Vitokhin
{"title":"Effect of Annealing and Additional Deformation on the Dynamic Properties of Ultrafine-Grained AMg4.5 Alloy","authors":"A. D. Evstifeev,&nbsp;E. Yu. Vitokhin","doi":"10.1134/S1063784224070132","DOIUrl":"10.1134/S1063784224070132","url":null,"abstract":"<p>The possibility of increasing the static and dynamic strength of the aluminum-magnesium alloy AMg4.5 is shown by using methods of severe plastic deformation, a combination of annealing and additional deformation of ultrafine grained alloy. The strength properties of the material are evaluated using a structural-temporal approach to the analysis of experimental data on the dynamic tension of small samples obtained on split-Hopkinson pressure bar.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"1950 - 1955"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414526","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}
引用次数: 0
Investigation of the Composition of Samarium Monosulfide Films Obtained by Electron Beam Heating 通过电子束加热获得的单硫化钐薄膜的成分研究
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070065
E. B. Baskakov, V. I. Strelov
{"title":"Investigation of the Composition of Samarium Monosulfide Films Obtained by Electron Beam Heating","authors":"E. B. Baskakov,&nbsp;V. I. Strelov","doi":"10.1134/S1063784224070065","DOIUrl":"10.1134/S1063784224070065","url":null,"abstract":"<div><p>The elemental composition of thin films obtained by electron beam heating of bulk SmS samples with a different element ratio: 1Sm:1S, 1.05Sm:1S and 1.15Sm:1S has been studied by energy dispersive spectroscopy. The analysis of elemental composition before and after spraying on the substrate was carried out on a volume sample of the composition 1.15Sm:1S. According to the microanalysis data, a change in the content of elements was established and an assessment of the change in the phase composition in the sprayed material was made. It is shown that the composition of the obtained thin films contains an excessive Sm content. A method for determining the inhomogeneity of the composition in depth for SmS films is proposed, in which, using a two stream model of charged particle transport, the dependence of the electron beam path on the primary electron energy in SmS for energies up to 30 keV is calculated.</p></div>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"1901 - 1906"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414472","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}
引用次数: 0
Mechanisms of Magnetic Field Formation at a Large Distance from the Galactic Center 距离银河中心较远的磁场形成机制
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070193
T. T. Khasaeva, E. A. Mikhailov
{"title":"Mechanisms of Magnetic Field Formation at a Large Distance from the Galactic Center","authors":"T. T. Khasaeva,&nbsp;E. A. Mikhailov","doi":"10.1134/S1063784224070193","DOIUrl":"10.1134/S1063784224070193","url":null,"abstract":"<p>The possibility of generating a magnetic field at a large distance (10–15 kpc) from the center of the galaxy has been investigated. The magnetic field can be generated both by the dynamo mechanism, considering nonlinear effects, and by magnetorotational instability. Presumably, the nonlinear effects of the dynamo mechanism play a more significant role at this distance.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"1994 - 1996"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414376","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}
引用次数: 0
A Method for Detecting Small Oscillations Based on Homodyne Demodulation with a Tandem Low-Coherence Interferometer 基于同调解调的串联低相干干涉仪小振荡检测方法
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070508
P. V. Volkov, D. A. Semikov, O. S. Vyazankin, A. V. Goryunov, A. Yu. Lukyanov, A. D. Tertyshnik
{"title":"A Method for Detecting Small Oscillations Based on Homodyne Demodulation with a Tandem Low-Coherence Interferometer","authors":"P. V. Volkov,&nbsp;D. A. Semikov,&nbsp;O. S. Vyazankin,&nbsp;A. V. Goryunov,&nbsp;A. Yu. Lukyanov,&nbsp;A. D. Tertyshnik","doi":"10.1134/S1063784224070508","DOIUrl":"10.1134/S1063784224070508","url":null,"abstract":"<p>The paper proposes a method for detecting small oscillations in the length of interference fiber-optic sensors, which makes it possible to compensate for the problem of slow drift of the working point with a remote sensor. The result is achieved by combining homodyne demodulation methods with a tandem low-coherence interferometer. Theoretically and experimentally, the possibility of detecting acoustic effects in the operating frequency band of 4 kHz with a sensitivity of up to 0.3 nm has been shown.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"2175 - 2178"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414491","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}
引用次数: 0
Characteristics of a Silicon Carbide Field Emission Array under Pre-Breakdown Conditions 预击穿条件下碳化硅场发射阵列的特性
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070314
V. A. Morozov, N. V. Egorov, V. V. Trofimov, K. A. Nikiforov, I. I. Zakirov, V. M. Kats, V. A. Ilyin, A. S. Ivanov
{"title":"Characteristics of a Silicon Carbide Field Emission Array under Pre-Breakdown Conditions","authors":"V. A. Morozov,&nbsp;N. V. Egorov,&nbsp;V. V. Trofimov,&nbsp;K. A. Nikiforov,&nbsp;I. I. Zakirov,&nbsp;V. M. Kats,&nbsp;V. A. Ilyin,&nbsp;A. S. Ivanov","doi":"10.1134/S1063784224070314","DOIUrl":"10.1134/S1063784224070314","url":null,"abstract":"<p>This study assesses promising field electron sources based on silicon carbide monolithic field emission array (FEA). FEA is fabricated on single-crystal wafers of silicon carbide (0001C) 6<i>H</i>-SiC of <i>n</i>-type conductivity using the technology of two-stage reactive ion etching in SF<sub>6</sub>/O<sub>2</sub>/Ar atmosphere. To implement conditions close to breakdown, an experimental setup based on high-voltage narrow pulses generating device GKVI-300 was used. A series of nanosecond voltage pulses with amplitudes from 120 to 250 kV was generated. To study the characteristics of the FEA in the pre-breakdown state, the beam of field emitted electrons was separated from the ion torch or cathode plasma, formed in the following breakdown phases, by placing a 50-μm-thick titanium foil under zero potential into the interelectrode gap. Current-voltage characteristics of peak-currents vs. peak-voltages passing through the foil are close to rectilinear in the Fowler–Nordheim coordinates. The current-voltage characteristics plotted for each of the pulses along increasing and decreasing branches show a discrepancy (hysteresis). After the experiments, the silicon carbide cathode FEA was studied in a scanning electron microscope.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"2059 - 2065"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414383","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}
引用次数: 0
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