Pub Date : 2023-01-01DOI: 10.21883/jtf.2023.08.55975.225-22
А. П. Кузьменко, Евгений Александрович Новиков, М. А. Пугачевский, В. В. Родионов, Виктор Григорьевич Заводинский, Ольга Александровна Горкуша, А. В. Сюй, Д.П. Аникин, С. В. Дежуров
Проведен сравнительный анализ особенностей многомасштабного структурирования ленгмюровских и центрифугированных пленок из стабилизированных TOPO (trioctylphosphine oxide) квантовых точек CdSe/CdS/ZnS с использованием методов оптической, зондовой и электронной микроскопии, включая микроскопию высокого разрешения и элементный энергодисперсионный анализ. Химическая структура изучена методами комбинационного (рамановского) рассеяния и ИК-фурье спектроскопии, рентгеновской дифрактометрии. Показано, что построенные на явлениях самоорганизации ленгмюровские нанопленки характеризуются более высокой сплошностью и однородностью, в то время как в центрифугированных пленках формируют кластеры с размерами от десятков до сотен нанометров. Выполнены расчеты из первых принципов методом функционала электронной плотности для ядер CdnSen, которые свидетельствовали о доминировании гексагональной плотной упаковки. Ключевые слова: микро- и наноструктурирование, пленки Ленгмюра-Блоджетт, центрифугированные пленки, квантовые точки, кластеризация.
{"title":"Многомасштабное структурирование квантовых точек CdSe/CdS/ZnS в центрифугированных и ленгмюровских пленках","authors":"А. П. Кузьменко, Евгений Александрович Новиков, М. А. Пугачевский, В. В. Родионов, Виктор Григорьевич Заводинский, Ольга Александровна Горкуша, А. В. Сюй, Д.П. Аникин, С. В. Дежуров","doi":"10.21883/jtf.2023.08.55975.225-22","DOIUrl":"https://doi.org/10.21883/jtf.2023.08.55975.225-22","url":null,"abstract":"Проведен сравнительный анализ особенностей многомасштабного структурирования ленгмюровских и центрифугированных пленок из стабилизированных TOPO (trioctylphosphine oxide) квантовых точек CdSe/CdS/ZnS с использованием методов оптической, зондовой и электронной микроскопии, включая микроскопию высокого разрешения и элементный энергодисперсионный анализ. Химическая структура изучена методами комбинационного (рамановского) рассеяния и ИК-фурье спектроскопии, рентгеновской дифрактометрии. Показано, что построенные на явлениях самоорганизации ленгмюровские нанопленки характеризуются более высокой сплошностью и однородностью, в то время как в центрифугированных пленках формируют кластеры с размерами от десятков до сотен нанометров. Выполнены расчеты из первых принципов методом функционала электронной плотности для ядер CdnSen, которые свидетельствовали о доминировании гексагональной плотной упаковки. Ключевые слова: микро- и наноструктурирование, пленки Ленгмюра-Блоджетт, центрифугированные пленки, квантовые точки, кластеризация.","PeriodicalId":24036,"journal":{"name":"Журнал технической физики","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73505788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/jtf.2023.02.54499.209-22
М. Ю. Грязнов, С. В. Шотин, Владимир Николаевич Чувильдеев, А. Н. Сысоев, Н. В. Мелехин, А. В. Пискунов, Н. В. Сахаров, А.В. Семенычева, А. А. Мурашов
Comprehensive studies of the physical and mechanical properties and structure of VT1-0 titanium samples processed by selective laser melting have been carried out. High strength characteristics (the ultimate tensile strength of 820 MPa, the yield strength of 710 MPa) have been achieved. These values exceed by 2 times the values for this material produced using conventional technology. The formation of the martensitic αʹ-phase, obtained due to the high crystallization rates realized in selective laser melting process, is the reason for the increase in the mechanical characteristics of titanium VT1-0. Mechanical characteristics of titanium VT1-0 subjected to high-temperature annealing demonstrated a monotonous decrease in strength parameters by 15% and an increase in plastic characteristics by 30%. It is shown that the technology of selective laser melting makes it possible to solve the problem of improving the strength characteristics of unalloyed titanium to create a new class of medical devices.
{"title":"Улучшение физико-механических характеристик нелегированного титана ВТ1-0 и исследование влияния на них режимов селективного лазерного сплавления","authors":"М. Ю. Грязнов, С. В. Шотин, Владимир Николаевич Чувильдеев, А. Н. Сысоев, Н. В. Мелехин, А. В. Пискунов, Н. В. Сахаров, А.В. Семенычева, А. А. Мурашов","doi":"10.21883/jtf.2023.02.54499.209-22","DOIUrl":"https://doi.org/10.21883/jtf.2023.02.54499.209-22","url":null,"abstract":"Comprehensive studies of the physical and mechanical properties and structure of VT1-0 titanium samples processed by selective laser melting have been carried out. High strength characteristics (the ultimate tensile strength of 820 MPa, the yield strength of 710 MPa) have been achieved. These values exceed by 2 times the values for this material produced using conventional technology. The formation of the martensitic αʹ-phase, obtained due to the high crystallization rates realized in selective laser melting process, is the reason for the increase in the mechanical characteristics of titanium VT1-0. Mechanical characteristics of titanium VT1-0 subjected to high-temperature annealing demonstrated a monotonous decrease in strength parameters by 15% and an increase in plastic characteristics by 30%. It is shown that the technology of selective laser melting makes it possible to solve the problem of improving the strength characteristics of unalloyed titanium to create a new class of medical devices.","PeriodicalId":24036,"journal":{"name":"Журнал технической физики","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74668678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/jtf.2023.02.54495.213-22
И. В. Янилкин, А. И. Гумаров, И. А. Головчанский, Г.Ф. Гиззатуллина, А. Г. Киямов, Б.Ф. Габбасов, Р. В. Юсупов, Л. Р. Тагиров
An epitaxial film of the Pd-Fe alloy 116 nm thick with an iron concentration varying in depth from 2 at.% to 50 at.% has been synthesized. An experimental depth distribution profile of iron was obtained as a result of stepwise etching of the film surface with Ar+ ions. Profiling showed that, as a result of annealing, the impurity was redistributed in the film, and a layer of the L10-phase with a constant concentration was formed near the film surface. After removal of the L10-phase, the film exhibits easy-plane anisotropy. The study of spin-wave resonance spectra showed the presence of several modes of standing spin waves, the number of which depends on the residual film thickness.
{"title":"Пленка сплава Pd-Fe с большим градиентом магнитной примеси: структурные и магнитные свойства","authors":"И. В. Янилкин, А. И. Гумаров, И. А. Головчанский, Г.Ф. Гиззатуллина, А. Г. Киямов, Б.Ф. Габбасов, Р. В. Юсупов, Л. Р. Тагиров","doi":"10.21883/jtf.2023.02.54495.213-22","DOIUrl":"https://doi.org/10.21883/jtf.2023.02.54495.213-22","url":null,"abstract":"An epitaxial film of the Pd-Fe alloy 116 nm thick with an iron concentration varying in depth from 2 at.% to 50 at.% has been synthesized. An experimental depth distribution profile of iron was obtained as a result of stepwise etching of the film surface with Ar+ ions. Profiling showed that, as a result of annealing, the impurity was redistributed in the film, and a layer of the L10-phase with a constant concentration was formed near the film surface. After removal of the L10-phase, the film exhibits easy-plane anisotropy. The study of spin-wave resonance spectra showed the presence of several modes of standing spin waves, the number of which depends on the residual film thickness.","PeriodicalId":24036,"journal":{"name":"Журнал технической физики","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74763354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/jtf.2023.09.56220.120-23
Александр Степанович Рудый, А. А. Мироненко, В. В. Наумов, А. Б. Чурилов, С. В. Курбатов, Ю. С. Егорова, Евгений Анатольевич Козлов
The results of measuring the charge-discharge characteristics of solid-state thin-film lithium-ion batteries with a nanocomposite anode based on a-Si(Al) solid solution are presented. The charging characteristics of batteries have a feature in the form of a step on the smooth branch of the charge curve. It is shown that the appearance of the step is associated with the compensation of a-Si(Al) and the change from hole to electron conductivity due to lithiation of the electrode during charging. As a result of lithiation, the electron over-barrier current becomes the main component of the charging current. To maintain a galvanostatic charge mode, the potentiostat increases the voltage by the height of the potential barrier, which leads to the appearance of a step on the charging curve. The impedance of a solid-state thin-film lithium-ion battery of the LiCoO2-LiPON-Si@O@Al electrochemical system was measured in the temperature range from -20°С to 50°С. A structural model of the accumulator is proposed and the parameters of the structural elements of the model are calculated which provide the best fit for experimental Nyquist diagrams. The obtained values of the electrodes’ resistivity are orders of magnitude higher than the results of direct measurements and data from literary sources. According to the IV-characteristics obtained by cyclic voltammetry the high resistance of the electrodes is due to the metal-semiconductor contact and the varistor effect of the electrode material. The results obtained make significant adjustments to the interpretation of the impedance spectra and structural models of solid-state lithium-ion batteries based on semiconductor materials
本文介绍了以a- si (Al)固溶体为基材的纳米复合负极对固态薄膜锂离子电池充放电特性的测量结果。电池的充电特性在充电曲线的光滑支路上以台阶的形式表现出来。结果表明，该阶跃的出现与a-Si(Al)的补偿以及充电过程中电极锂化引起的空穴电导率到电子电导率的变化有关。由于锂化，电子过势垒电流成为充电电流的主要组成部分。为了保持恒流充电模式，恒电位器通过电位势垒的高度来增加电压，从而导致充电曲线上出现一个台阶。测量了LiCoO2-LiPON-Si@O@Al电化学体系固态薄膜锂离子电池在-20°С ~ 50°С温度范围内的阻抗。提出了蓄能器的结构模型，并计算了模型中各结构单元的参数，得到了最适合实验奈奎斯特图的参数。所得的电极电阻率值比直接测量的结果和文献资料的数据高几个数量级。根据循环伏安法得到的iv特性，电极的高电阻是由金属-半导体接触和电极材料的压敏效应引起的。所得结果对基于半导体材料的固态锂离子电池的阻抗谱和结构模型的解释进行了重大调整
{"title":"Влияние варисторного эффекта и контактных явлений на характеристики твердотельных литий-ионных аккумуляторов с полупроводниковыми электродами","authors":"Александр Степанович Рудый, А. А. Мироненко, В. В. Наумов, А. Б. Чурилов, С. В. Курбатов, Ю. С. Егорова, Евгений Анатольевич Козлов","doi":"10.21883/jtf.2023.09.56220.120-23","DOIUrl":"https://doi.org/10.21883/jtf.2023.09.56220.120-23","url":null,"abstract":"The results of measuring the charge-discharge characteristics of solid-state thin-film lithium-ion batteries with a nanocomposite anode based on a-Si(Al) solid solution are presented. The charging characteristics of batteries have a feature in the form of a step on the smooth branch of the charge curve. It is shown that the appearance of the step is associated with the compensation of a-Si(Al) and the change from hole to electron conductivity due to lithiation of the electrode during charging. As a result of lithiation, the electron over-barrier current becomes the main component of the charging current. To maintain a galvanostatic charge mode, the potentiostat increases the voltage by the height of the potential barrier, which leads to the appearance of a step on the charging curve. The impedance of a solid-state thin-film lithium-ion battery of the LiCoO2-LiPON-Si@O@Al electrochemical system was measured in the temperature range from -20°С to 50°С. A structural model of the accumulator is proposed and the parameters of the structural elements of the model are calculated which provide the best fit for experimental Nyquist diagrams. The obtained values of the electrodes’ resistivity are orders of magnitude higher than the results of direct measurements and data from literary sources. According to the IV-characteristics obtained by cyclic voltammetry the high resistance of the electrodes is due to the metal-semiconductor contact and the varistor effect of the electrode material. The results obtained make significant adjustments to the interpretation of the impedance spectra and structural models of solid-state lithium-ion batteries based on semiconductor materials","PeriodicalId":24036,"journal":{"name":"Журнал технической физики","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72637153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/jtf.2023.03.54853.231-22
В. И. Николаев, А Я Поляков, Степан Игоревич Степанов, А.И. Печников, В. В. Николаев, Е. Б. Якимов, М.П. Щеглов, А.В. Чикиряка, Л.И. Гузилова, Р.Б. Тимашов, С.В. Шапенков, П.Н. Бутенко
Record thick (up to 100 μm) epitaxial layers of a prospective semiconductor metastable Ga2O3 were grown by HVPE (Halide Vapor Phase Epitaxy) on GaN buffer layers on c-sapphire substrate. The X-ray diffraction spectra of the layers show that the structure of the layer is a pure k(ε)-Ga2O3 without any other phases. At the same time, the organization of the domain structure is noted, which manifests itself in the form of pseudohexagonal prisms with the inheritance of the orientation of the gallium nitride sublayer. Schottky diodes with a nickel contact were fabricated and the electrical and photoelectric properties of the layers were studied. Capacitance-voltage (C-V) and frequency-capacitance (C-f) dependencies have been studied, photocurrent and photocapacitance spectra have been measured.
{"title":"Рекордно толстые эпитаксиальные слои kappa(ε)-Ga-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-, выращенные на GaN/c-сапфире","authors":"В. И. Николаев, А Я Поляков, Степан Игоревич Степанов, А.И. Печников, В. В. Николаев, Е. Б. Якимов, М.П. Щеглов, А.В. Чикиряка, Л.И. Гузилова, Р.Б. Тимашов, С.В. Шапенков, П.Н. Бутенко","doi":"10.21883/jtf.2023.03.54853.231-22","DOIUrl":"https://doi.org/10.21883/jtf.2023.03.54853.231-22","url":null,"abstract":"Record thick (up to 100 μm) epitaxial layers of a prospective semiconductor metastable Ga2O3 were grown by HVPE (Halide Vapor Phase Epitaxy) on GaN buffer layers on c-sapphire substrate. The X-ray diffraction spectra of the layers show that the structure of the layer is a pure k(ε)-Ga2O3 without any other phases. At the same time, the organization of the domain structure is noted, which manifests itself in the form of pseudohexagonal prisms with the inheritance of the orientation of the gallium nitride sublayer. Schottky diodes with a nickel contact were fabricated and the electrical and photoelectric properties of the layers were studied. Capacitance-voltage (C-V) and frequency-capacitance (C-f) dependencies have been studied, photocurrent and photocapacitance spectra have been measured.","PeriodicalId":24036,"journal":{"name":"Журнал технической физики","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80058877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/jtf.2023.09.56219.113-23
T.Б. Никуличева, В. С. Захвалинский, E.A. Пилюк, И.С. Никулин, В В Вязьмин, M.В. Мишунин, M.Ю. Саенко, O.A. Tельпова, Н.И. Aлфимова, T.A. Eрина
At present, the problem of using as functional materials such materials that are a by-product of technological processes and accumulate in the form of production waste is becoming more relevant. We have studied two groups of samples. The first group became the basis for a new material for the air humidity sensor, which was obtained from the waste products of citric acid production. Samples of citrogypsum (calcium sulfate dihydrate, i.e. CaSO42H2O) doped with copper sulfate (CuSO45H2O) were prepared. The dependence of the impedance on the relative humidity of samples of three thicknesses was carried out. The frequency dependences of complex resistance and relative permittivity on relative humidity are measured. The second group of samples obtained from citrogypsum was a powder consisting of CaSO42H2O whiskers. Whiskers CaSO42H2O were used to create composites based on epoxy resin. An improvement in the properties of the composite was recorded in the study of tensile and compressive stresses of the samples. This article shows the possibility of practical application of (CaSO42H2O)0.95–(CuSO45H2O)0.05 as a new air humidity sensor material and improvement of the mechanical properties of the composite based on epoxy resin and CaSO42H2O whiskers.
{"title":"Свойства цитрогипса и возможности его применения в технике","authors":"T.Б. Никуличева, В. С. Захвалинский, E.A. Пилюк, И.С. Никулин, В В Вязьмин, M.В. Мишунин, M.Ю. Саенко, O.A. Tельпова, Н.И. Aлфимова, T.A. Eрина","doi":"10.21883/jtf.2023.09.56219.113-23","DOIUrl":"https://doi.org/10.21883/jtf.2023.09.56219.113-23","url":null,"abstract":"At present, the problem of using as functional materials such materials that are a by-product of technological processes and accumulate in the form of production waste is becoming more relevant. We have studied two groups of samples. The first group became the basis for a new material for the air humidity sensor, which was obtained from the waste products of citric acid production. Samples of citrogypsum (calcium sulfate dihydrate, i.e. CaSO42H2O) doped with copper sulfate (CuSO45H2O) were prepared. The dependence of the impedance on the relative humidity of samples of three thicknesses was carried out. The frequency dependences of complex resistance and relative permittivity on relative humidity are measured. The second group of samples obtained from citrogypsum was a powder consisting of CaSO42H2O whiskers. Whiskers CaSO42H2O were used to create composites based on epoxy resin. An improvement in the properties of the composite was recorded in the study of tensile and compressive stresses of the samples. This article shows the possibility of practical application of (CaSO42H2O)0.95–(CuSO45H2O)0.05 as a new air humidity sensor material and improvement of the mechanical properties of the composite based on epoxy resin and CaSO42H2O whiskers.","PeriodicalId":24036,"journal":{"name":"Журнал технической физики","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82979705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/jtf.2023.07.55763.82-23
А. П. Чукланов, Анастасия Сергеевна Морозова, Н.И. Нургазизов, Е. О. Митюшкин, Д. К. Жарков, А. В. Леонтьев, В. Г. Никифоров
The possibility of precise movement of YVO4:Yb,Er nanoparticles was studied in this work. Such nanoparticles exhibit upconversion luminescent properties and can serve as an accurate low-invasive probe of changes in the local parameters of the medium (in particular, temperature). Using an atomic force microscope, the substrate region with upconversion nanoparticles deposited from the solution and accompanying residues of the synthesis products was cleaned. The use of mechanical marks on the substrate made it possible to compare the atomic force and optical confocal images of the surface and to register the luminescence from an individual nanoparticle. Elemental analysis and luminescence spectra unambiguously identify the nanoparticle as YVO4:Yb,Er.
{"title":"Прецизионное перемещение апконверсионных наночастиц по поверхности с использованием сканирующей зондовой микроскопии","authors":"А. П. Чукланов, Анастасия Сергеевна Морозова, Н.И. Нургазизов, Е. О. Митюшкин, Д. К. Жарков, А. В. Леонтьев, В. Г. Никифоров","doi":"10.21883/jtf.2023.07.55763.82-23","DOIUrl":"https://doi.org/10.21883/jtf.2023.07.55763.82-23","url":null,"abstract":"The possibility of precise movement of YVO4:Yb,Er nanoparticles was studied in this work. Such nanoparticles exhibit upconversion luminescent properties and can serve as an accurate low-invasive probe of changes in the local parameters of the medium (in particular, temperature). Using an atomic force microscope, the substrate region with upconversion nanoparticles deposited from the solution and accompanying residues of the synthesis products was cleaned. The use of mechanical marks on the substrate made it possible to compare the atomic force and optical confocal images of the surface and to register the luminescence from an individual nanoparticle. Elemental analysis and luminescence spectra unambiguously identify the nanoparticle as YVO4:Yb,Er.","PeriodicalId":24036,"journal":{"name":"Журнал технической физики","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85557888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/jtf.2023.02.54494.236-22
А. В. Загнитько, В. В. Пименов, С. Е. Сальников, Д. Ю. Федин, В. И. Алексеев, И. Д. Мацуков, С. М. Вельмакин, Н. П. Зарецкий, Е. В. Черненко
A two-channel analyzer of optically dense flammable aerosol fluxes based on two parallel diode optocouplers with a wavelength of electromagnetic radiation λ = 0.65 and 3.4 μm, a speed of τ ≤ 0.05 s and the transmission of digitized data to a server up to 1200 m away via the RS-485 interface has been developed. Its design and characteristics in the process of detecting particle streams with a diameter of 0.2 to 5000 μm with an optical density of D ≤ 3.5 are described. It is shown that the values of the ratio of wave attenuation coefficients with λ = 0.65 and 3.4 μm to the droplet size calculated on the basis of the theory of radiation scattering Mi are consistent with the experimental ones. The created aerosol analyzer can be used in the express analysis of technogenic airborne emissions of fuel liquids and for the development of large-scale generators of explosive type when creating pulse barriers from clouds of finely dispersed aerosol in the atmosphere.
{"title":"Быстродействующий двухканальный анализатор оптически плотных выбросов аэрозолей на основе диодных оптопар с длиной волны 0.65 и 3.4 микрона","authors":"А. В. Загнитько, В. В. Пименов, С. Е. Сальников, Д. Ю. Федин, В. И. Алексеев, И. Д. Мацуков, С. М. Вельмакин, Н. П. Зарецкий, Е. В. Черненко","doi":"10.21883/jtf.2023.02.54494.236-22","DOIUrl":"https://doi.org/10.21883/jtf.2023.02.54494.236-22","url":null,"abstract":"A two-channel analyzer of optically dense flammable aerosol fluxes based on two parallel diode optocouplers with a wavelength of electromagnetic radiation λ = 0.65 and 3.4 μm, a speed of τ ≤ 0.05 s and the transmission of digitized data to a server up to 1200 m away via the RS-485 interface has been developed. Its design and characteristics in the process of detecting particle streams with a diameter of 0.2 to 5000 μm with an optical density of D ≤ 3.5 are described. It is shown that the values of the ratio of wave attenuation coefficients with λ = 0.65 and 3.4 μm to the droplet size calculated on the basis of the theory of radiation scattering Mi are consistent with the experimental ones. The created aerosol analyzer can be used in the express analysis of technogenic airborne emissions of fuel liquids and for the development of large-scale generators of explosive type when creating pulse barriers from clouds of finely dispersed aerosol in the atmosphere.","PeriodicalId":24036,"journal":{"name":"Журнал технической физики","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73124714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/jtf.2023.08.55982.288-22
Н.Д. Прасолов, А.И. Лихачев, Р. В. Соколов, Артем Андреевич Левин, М. В. Нарыкова, А. Г. Кадомцев, П.Н. Брунков, М. М. Султанов, А.В. Стрижиченко, И. А. Болдырев
Presented results of active resistance frequency dependence measurements of a circular cross-section aluminum and copper conductors with a various diameter in a wide frequency range from 20Hz to 2MHz. Using the skin effect simulation we show that for all types of wires an increased active resistance observed, compared to the theoretical values in the frequency range above 200 kHz, where the skin layer thickness becomes less than 200 μm. This phenomenon may be associated with the manufacturing process of a metal wire by drawing through a die, when defects are formed in the near-surface layer, leading to its increased resistivity.
{"title":"Измерения частотной зависимости скин-эффекта металлических проводов с круглым сечением","authors":"Н.Д. Прасолов, А.И. Лихачев, Р. В. Соколов, Артем Андреевич Левин, М. В. Нарыкова, А. Г. Кадомцев, П.Н. Брунков, М. М. Султанов, А.В. Стрижиченко, И. А. Болдырев","doi":"10.21883/jtf.2023.08.55982.288-22","DOIUrl":"https://doi.org/10.21883/jtf.2023.08.55982.288-22","url":null,"abstract":"Presented results of active resistance frequency dependence measurements of a circular cross-section aluminum and copper conductors with a various diameter in a wide frequency range from 20Hz to 2MHz. Using the skin effect simulation we show that for all types of wires an increased active resistance observed, compared to the theoretical values in the frequency range above 200 kHz, where the skin layer thickness becomes less than 200 μm. This phenomenon may be associated with the manufacturing process of a metal wire by drawing through a die, when defects are formed in the near-surface layer, leading to its increased resistivity.","PeriodicalId":24036,"journal":{"name":"Журнал технической физики","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73312465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/jtf.2023.08.55980.110-23
Андрей Владимирович Ушаков, Л.Ю. Федоров
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.
{"title":"Исследование магнитоимпедансных свойств наночастиц CuO, полученных в плазме дугового разряда низкого давления","authors":"Андрей Владимирович Ушаков, Л.Ю. Федоров","doi":"10.21883/jtf.2023.08.55980.110-23","DOIUrl":"https://doi.org/10.21883/jtf.2023.08.55980.110-23","url":null,"abstract":"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.","PeriodicalId":24036,"journal":{"name":"Журнал технической физики","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79932699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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