Pub Date : 2023-01-01DOI: 10.21883/ftt.2023.04.55299.19
М. Е. Компан, О.И. Коньков, С. Е. Никитин, В. Г. Малышкин
Raman scattering spectra of linear carbon chains (carbines) localized in thin gold films of variable thickness are investigated. It is shown that the integral line is inhomogeneous, and separate components are identified, the intensity of which depends in a non-trivial way on the thickness of the film. Qualitative explanations of the detected effects are proposed.
{"title":"Особенности спектров комбинационного рассеяния света в области линии 2100 cm-=SUP=--1-=/SUP=- углеродными образованиями в тонких градиентных пленках золота","authors":"М. Е. Компан, О.И. Коньков, С. Е. Никитин, В. Г. Малышкин","doi":"10.21883/ftt.2023.04.55299.19","DOIUrl":"https://doi.org/10.21883/ftt.2023.04.55299.19","url":null,"abstract":"Raman scattering spectra of linear carbon chains (carbines) localized in thin gold films of variable thickness are investigated. It is shown that the integral line is inhomogeneous, and separate components are identified, the intensity of which depends in a non-trivial way on the thickness of the film. Qualitative explanations of the detected effects are proposed.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88991635","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/ftt.2023.03.54751.545
С. В. Булярский, А. А. Дудин, К.И. Литвинова, Александр Александрович Павлов, Григорий Александрович Рудаков
This article compares TiN layers produced by electron beam evaporation (EBE) and atomic layer deposition (ALD) for the effect of barrier layer deposition technology on the formation of carbon nanotube (CNT) growth catalyst nanoparticles. The layers obtained by EBE have a roughness 1.5 times higher than the layers deposited by the ALD method (Ra = 1 nm and Ra = 0.6 nm). Nanoparticles formed on the surface of the EBE layer are characterized by a large average size (about 30 nm) and a 1.3 times greater dispersion of the distribution compared to nanoparticles formed on the ALD layer. TiN layers obtained by EBE are characterized by better surface wettability in comparison with ALD layers. The contact angle for catalyst nanoparticles on the surface of the EBE layer of TiN is about 30 degrees and approaches 90 degrees for ALD layers. Catalyst spreading is due to the Wenzel model. It is shown that the higher surface roughness of the EBE samples is associated with the crystallization of TiN, since the layer formation process proceeds at a higher temperature compared to the ALD process. For this reason, the use of barrier layers obtained by the ALD method is preferable for the formation of CNT growth catalyst nanoparticles on their surface.
{"title":"Влияние шероховатости барьерного слоя на формирования наночастиц катализатора роста углеродных нанотрубок","authors":"С. В. Булярский, А. А. Дудин, К.И. Литвинова, Александр Александрович Павлов, Григорий Александрович Рудаков","doi":"10.21883/ftt.2023.03.54751.545","DOIUrl":"https://doi.org/10.21883/ftt.2023.03.54751.545","url":null,"abstract":"This article compares TiN layers produced by electron beam evaporation (EBE) and atomic layer deposition (ALD) for the effect of barrier layer deposition technology on the formation of carbon nanotube (CNT) growth catalyst nanoparticles. The layers obtained by EBE have a roughness 1.5 times higher than the layers deposited by the ALD method (Ra = 1 nm and Ra = 0.6 nm). Nanoparticles formed on the surface of the EBE layer are characterized by a large average size (about 30 nm) and a 1.3 times greater dispersion of the distribution compared to nanoparticles formed on the ALD layer. TiN layers obtained by EBE are characterized by better surface wettability in comparison with ALD layers. The contact angle for catalyst nanoparticles on the surface of the EBE layer of TiN is about 30 degrees and approaches 90 degrees for ALD layers. Catalyst spreading is due to the Wenzel model. It is shown that the higher surface roughness of the EBE samples is associated with the crystallization of TiN, since the layer formation process proceeds at a higher temperature compared to the ALD process. For this reason, the use of barrier layers obtained by the ALD method is preferable for the formation of CNT growth catalyst nanoparticles on their surface.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90967418","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/ftt.2023.05.55489.46
Магомед Нуцалавович Магомедов
A new analytical (i.e., without computer modeling) method for calculating the dependence of the melting temperature (Tm) of a single-component crystal on pressure (P) is proposed. The method is based on the delocalization melting criterion and does not contain fitting constants. The baric dependences of the melting temperature Tm(P) and its pressure derivative Tm(P) for gold, platinum and niobium in the pressure range: P = 0 – 1000 GPa were calculated by this method. It was shown that the dependences calculated by this method for gold and platinum agree better with the experimental data than the dependences obtained by computer simulation methods. For niobium, the calculated dependence Tm(P) turned out to be steeper, i.e., the value Tm(P) turned out to be larger than in the experiment. It was indicated that this discrepancy might be due both to a decrease in the Lindemann parameter with increasing pressure and to a redistribution of electrons on the s-d-orbitals during compression of transition metals with a BCC structure.
{"title":"Изменение температуры плавления металлов с ростом давления","authors":"Магомед Нуцалавович Магомедов","doi":"10.21883/ftt.2023.05.55489.46","DOIUrl":"https://doi.org/10.21883/ftt.2023.05.55489.46","url":null,"abstract":"A new analytical (i.e., without computer modeling) method for calculating the dependence of the melting temperature (Tm) of a single-component crystal on pressure (P) is proposed. The method is based on the delocalization melting criterion and does not contain fitting constants. The baric dependences of the melting temperature Tm(P) and its pressure derivative Tm(P) for gold, platinum and niobium in the pressure range: P = 0 – 1000 GPa were calculated by this method. It was shown that the dependences calculated by this method for gold and platinum agree better with the experimental data than the dependences obtained by computer simulation methods. For niobium, the calculated dependence Tm(P) turned out to be steeper, i.e., the value Tm(P) turned out to be larger than in the experiment. It was indicated that this discrepancy might be due both to a decrease in the Lindemann parameter with increasing pressure and to a redistribution of electrons on the s-d-orbitals during compression of transition metals with a BCC structure.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"86 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80984018","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/ftt.2023.09.56242.115
П.А. Дементьев, Е. В. Дементьева, М. Н. Лапушкин, С.Н. Тимошнев
n situ photoelectron spectroscopy studies have been carried out in ultrahigh vacuum of the electronic structure of a 2D Au film deposited on a surface W with a natural oxide, before and after adsorption of Na atoms. The spectra of photoemission from the valence band and core levels of Au 4f, W 4f and Na 2p were studied under synchrotron excitation in the photon energy range of 120-300 eV. The investigated 2D Au film with a thickness of 0.83 nm has a valence band close to the valence band of the massive sample. The diffusion of Na atoms deep into the gold film was not detected, which indicates the layered growth of the 2D Au film. Two states have been found: Nadelta+ and Na+, which exist even with a 0.15 sodium coating of the monolayer, which indicates the formation of Na islands and single adsorption of Na atoms. The density functional method is used to calculate the electronic structure of a 2D Au layer without and with adsorbed Na. It is established that the adsorption of Na atoms in the pit or bridge position is preferable. It is found that the adsorption of Na leads to the reconstruction of the surface.
{"title":"Субмонослойные покрытия натрия на поверхности золотой пленки","authors":"П.А. Дементьев, Е. В. Дементьева, М. Н. Лапушкин, С.Н. Тимошнев","doi":"10.21883/ftt.2023.09.56242.115","DOIUrl":"https://doi.org/10.21883/ftt.2023.09.56242.115","url":null,"abstract":"n situ photoelectron spectroscopy studies have been carried out in ultrahigh vacuum of the electronic structure of a 2D Au film deposited on a surface W with a natural oxide, before and after adsorption of Na atoms. The spectra of photoemission from the valence band and core levels of Au 4f, W 4f and Na 2p were studied under synchrotron excitation in the photon energy range of 120-300 eV. The investigated 2D Au film with a thickness of 0.83 nm has a valence band close to the valence band of the massive sample. The diffusion of Na atoms deep into the gold film was not detected, which indicates the layered growth of the 2D Au film. Two states have been found: Nadelta+ and Na+, which exist even with a 0.15 sodium coating of the monolayer, which indicates the formation of Na islands and single adsorption of Na atoms. The density functional method is used to calculate the electronic structure of a 2D Au layer without and with adsorbed Na. It is established that the adsorption of Na atoms in the pit or bridge position is preferable. It is found that the adsorption of Na leads to the reconstruction of the surface.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81245099","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/ftt.2023.06.55659.27h
С. А. Шарко, А. И. Серокурова, Н. Н. Новицкий, Н. Н. Поддубная, В. А. Кецко, А. И. Стогний
In the layered ferromagnetic /ferroelectric structures in the form of cobalt, nickel or permendur layer on a ferroelectric substrate of lead zirconate titanate obtained by ion-beam sputtering – deposi-tion, relative strains due to mismatch of crystal lattices of mating materials at the metal / substrate in-terface make a more noticeable contribution to the magnetoelectric response than those associated both with the magnetostriction of the ferromagnetic layer and with the piezoelectric effect of the fer-roelectric substrate. The structures obtained are characterized by the thermal stability and reproduci-bility of magnetoelectric characteristics and can be used as converters of magnetic and electrical quantities, for example, in magnetic field sensors and actuators.
{"title":"Влияние упруго-напряженного состояния интерфейсов на магнитоэлектрические свойства слоистых структур ферромагнетик/сегнетоэлектрик","authors":"С. А. Шарко, А. И. Серокурова, Н. Н. Новицкий, Н. Н. Поддубная, В. А. Кецко, А. И. Стогний","doi":"10.21883/ftt.2023.06.55659.27h","DOIUrl":"https://doi.org/10.21883/ftt.2023.06.55659.27h","url":null,"abstract":"In the layered ferromagnetic /ferroelectric structures in the form of cobalt, nickel or permendur layer on a ferroelectric substrate of lead zirconate titanate obtained by ion-beam sputtering – deposi-tion, relative strains due to mismatch of crystal lattices of mating materials at the metal / substrate in-terface make a more noticeable contribution to the magnetoelectric response than those associated both with the magnetostriction of the ferromagnetic layer and with the piezoelectric effect of the fer-roelectric substrate. The structures obtained are characterized by the thermal stability and reproduci-bility of magnetoelectric characteristics and can be used as converters of magnetic and electrical quantities, for example, in magnetic field sensors and actuators.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81277260","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}
Glass formation processes in condensed matter are characterized by some specific short-range order changes in the arrangement of particles (atoms/molecules/ions). So, the short-range structural order in supercooled liquids and glasses is characterized by fivefold symmetry in the arrangement of particles, often referred to as icosahedral (ideal or distorted) short-range order. This article is devoted to the study of local structural features of the supercooled melt of the A20B80 fullerene mixture (where A = C60 and B = C70) obtained under various cooling protocols in order to elucidate the mechanism of formation of the icosahedral short-range order in binary molecular liquids. Comprehensive studies of the properties of a fullerene mixture melt were carried out using large-scale molecular dynamics simulations followed by structural and cluster analysis. The crystallization temperature and the critical glass transition temperature of the system were calculated to be Tm ≈ 1439 K and Tc ≈ 1238 K, respectively. It has been established that the crystallization of a binary fullerene mixture proceeds according to the polycrystalline scenario with the formation of clusters with fcc and hcp symmetries. It is shown that in a supercooled fullerene mixture, the short-range icosahedral order is formed by an insignificant number of ideal icosahedral clusters and a certain set of distorted icosahedral clusters, the fraction of which remains practically unchanged at temperatures below the critical glass transition temperature.
凝聚态物质中的玻璃形成过程以粒子(原子/分子/离子)排列的一些特定的短期顺序变化为特征。因此，过冷液体和玻璃中的近程结构秩序以粒子排列的五重对称为特征，通常称为二十面体(理想或畸变)近程秩序。本文研究了不同冷却方案下得到的A20B80富勒烯混合物(A = C60, B = C70)过冷熔体的局部结构特征，以阐明二元分子液体中二十面体近程序的形成机理。采用大规模分子动力学模拟、结构分析和聚类分析对富勒烯混合物熔体的性质进行了全面研究。计算得到体系的结晶温度为Tm≈1439 K，临界玻璃化转变温度为Tc≈1238 K。二元富勒烯混合物的结晶过程符合多晶情况，形成具有fcc和hcp对称性的团簇。结果表明，在过冷富勒烯混合物中，理想二十面体团簇和一定数量的畸变二十面体团簇构成了近程二十面体序，在低于临界玻璃化转变温度时，畸变二十面体团簇的比例基本保持不变。
{"title":"Процессы структурообразования в фуллереновых смесях","authors":"Рамиль Миннегаязович Хуснутдинов, Регина Радиевна Хайруллина","doi":"10.21883/ftt.2023.01.53940.501","DOIUrl":"https://doi.org/10.21883/ftt.2023.01.53940.501","url":null,"abstract":"Glass formation processes in condensed matter are characterized by some specific short-range order changes in the arrangement of particles (atoms/molecules/ions). So, the short-range structural order in supercooled liquids and glasses is characterized by fivefold symmetry in the arrangement of particles, often referred to as icosahedral (ideal or distorted) short-range order. This article is devoted to the study of local structural features of the supercooled melt of the A20B80 fullerene mixture (where A = C60 and B = C70) obtained under various cooling protocols in order to elucidate the mechanism of formation of the icosahedral short-range order in binary molecular liquids. Comprehensive studies of the properties of a fullerene mixture melt were carried out using large-scale molecular dynamics simulations followed by structural and cluster analysis. The crystallization temperature and the critical glass transition temperature of the system were calculated to be Tm ≈ 1439 K and Tc ≈ 1238 K, respectively. It has been established that the crystallization of a binary fullerene mixture proceeds according to the polycrystalline scenario with the formation of clusters with fcc and hcp symmetries. It is shown that in a supercooled fullerene mixture, the short-range icosahedral order is formed by an insignificant number of ideal icosahedral clusters and a certain set of distorted icosahedral clusters, the fraction of which remains practically unchanged at temperatures below the critical glass transition temperature.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76825696","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/ftt.2023.04.55295.13
Анна Владимировна Павленко, Татьяна Сергеевна Ильина, Д. А. Киселев, Д.В. Стрюков
The phase composition, nanostructure, and properties of Ba2NdFeNb4O15/Si(001) multiferroic thin films have been studied by X-ray diffraction analysis, scanning probe microscopy, and capacitance-voltage characteristics analysis. The RF cathode sputtering in an oxygen atmosphere was used for films fabrication. It has been found that the obtained Ba2NdFeNb4O15 films are single-phase, impurity-free, polycrystalline textured (c-oriented), and the out-of-plane strain is 0.8%, which leads to the presence of ferroelectric properties at room temperature. It is shown that the surface roughness of the films is ~ 15.39 nm, the lateral size of the crystallites is ~ 134 nm, and the relative permittivity in the temperature range of -190…150 °C is 95-130. The reasons for the revealed regularities are discussed.
{"title":"Фазовый состав, кристаллическая структура, диэлектрические и сегнетоэлектрические свойства тонких пленок Ba-=SUB=-2-=/SUB=-NdFeNb-=SUB=-4-=/SUB=-O-=SUB=-15-=/SUB=-, выращенных на подложке Si(001) в атмосфере кислорода","authors":"Анна Владимировна Павленко, Татьяна Сергеевна Ильина, Д. А. Киселев, Д.В. Стрюков","doi":"10.21883/ftt.2023.04.55295.13","DOIUrl":"https://doi.org/10.21883/ftt.2023.04.55295.13","url":null,"abstract":"The phase composition, nanostructure, and properties of Ba2NdFeNb4O15/Si(001) multiferroic thin films have been studied by X-ray diffraction analysis, scanning probe microscopy, and capacitance-voltage characteristics analysis. The RF cathode sputtering in an oxygen atmosphere was used for films fabrication. It has been found that the obtained Ba2NdFeNb4O15 films are single-phase, impurity-free, polycrystalline textured (c-oriented), and the out-of-plane strain is 0.8%, which leads to the presence of ferroelectric properties at room temperature. It is shown that the surface roughness of the films is ~ 15.39 nm, the lateral size of the crystallites is ~ 134 nm, and the relative permittivity in the temperature range of -190…150 °C is 95-130. The reasons for the revealed regularities are discussed.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"131 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79632353","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/ftt.2023.08.56147.103
Виталий Витальевич Синицын, О.Г. Рыбченко, В.Б. Ефимов, А А Вирюс
The article presents experimental studies of structural changes that occur during heating of nanosized powders of amorphous ice obtained by decay of a water-helium gel. Thermal annealing of the obtained samples was carried out by short exposures (about 15 minutes) at different temperatures in the range of 110-230K. The behavior of the amorphous phase during annealing was analyzed within the framework of its description by a mixture of amorphous ices of low and medium density (LDA and MDA, respectively). It was found that at the such description, the virgin sample was predominantly in the MDA state, while the proportion of the LDA phase was about 7 times less (MDA/LDA ≈ 7:1). It has been established that during annealing, a multistage process of structural transformations of the initial LDA + MDA sample takes place: from initial changes in the amorphous state at 110 K through crystallization of the cubic ice phase Ic with its intensive growth at a temperature of 130 K to the transformation of cubic ice into the hexagonal phase Ih in the temperature range T =135÷230K.
{"title":"Аморфный лед средней плотности, полученный разложением водно-гелиевого геля","authors":"Виталий Витальевич Синицын, О.Г. Рыбченко, В.Б. Ефимов, А А Вирюс","doi":"10.21883/ftt.2023.08.56147.103","DOIUrl":"https://doi.org/10.21883/ftt.2023.08.56147.103","url":null,"abstract":"The article presents experimental studies of structural changes that occur during heating of nanosized powders of amorphous ice obtained by decay of a water-helium gel. Thermal annealing of the obtained samples was carried out by short exposures (about 15 minutes) at different temperatures in the range of 110-230K. The behavior of the amorphous phase during annealing was analyzed within the framework of its description by a mixture of amorphous ices of low and medium density (LDA and MDA, respectively). It was found that at the such description, the virgin sample was predominantly in the MDA state, while the proportion of the LDA phase was about 7 times less (MDA/LDA ≈ 7:1). It has been established that during annealing, a multistage process of structural transformations of the initial LDA + MDA sample takes place: from initial changes in the amorphous state at 110 K through crystallization of the cubic ice phase Ic with its intensive growth at a temperature of 130 K to the transformation of cubic ice into the hexagonal phase Ih in the temperature range T =135÷230K.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78119827","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/ftt.2023.05.55507.40
С. В. Булярский, А. А. Дудин, А. В. Лакалин, А. П. Орлов
Моделируется катастрофическая деградация эмиссионных катодов на основе углеродных нанотрубок, которая происходит из-за разрушения нанотрубки в дефектной области в результате перегрева. Модель учитывает разогрев нанотрубки путем выделения тепла Джоуля, а также радиационное излучение и охлаждение вследствие эффекта Нотингема, заключающегося в уменьшении температуры эмитирующего конца за счет энергии, уносимой потоком эмитированных электронов. Предложенная модель сравнивается с экспериментом по деградации одиночной нанотрубки. Эксперимент подтверждает катастрофическое разрушение и показывает, что разрушению способствует возникновение термоэлектронной эмиссии, которая вызывает быстрый рост тока и, соответственно, температуры дефектной области нанотрубки. Ключевые слова: автоэлектронные эмиттеры, деградация, разогрев нанотрубки, дефекты, катастрофическое разрушение.
{"title":"Катастрофическое разрушение углеродных нанотрубок при деградации автоэлектронных эмиттеров","authors":"С. В. Булярский, А. А. Дудин, А. В. Лакалин, А. П. Орлов","doi":"10.21883/ftt.2023.05.55507.40","DOIUrl":"https://doi.org/10.21883/ftt.2023.05.55507.40","url":null,"abstract":"Моделируется катастрофическая деградация эмиссионных катодов на основе углеродных нанотрубок, которая происходит из-за разрушения нанотрубки в дефектной области в результате перегрева. Модель учитывает разогрев нанотрубки путем выделения тепла Джоуля, а также радиационное излучение и охлаждение вследствие эффекта Нотингема, заключающегося в уменьшении температуры эмитирующего конца за счет энергии, уносимой потоком эмитированных электронов. Предложенная модель сравнивается с экспериментом по деградации одиночной нанотрубки. Эксперимент подтверждает катастрофическое разрушение и показывает, что разрушению способствует возникновение термоэлектронной эмиссии, которая вызывает быстрый рост тока и, соответственно, температуры дефектной области нанотрубки. Ключевые слова: автоэлектронные эмиттеры, деградация, разогрев нанотрубки, дефекты, катастрофическое разрушение.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84750071","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/ftt.2023.08.56163.121
О. Е. Глухова, М. М. Слепченков
Using computer materials science methods based on first-principles approaches and high-performance computing, we have studied the effect of hafnium carbide (HfC) nanoparticles on the emission properties of graphene/nanotube hybrid films. The optimal distance between graphene/nanotube structures in the composition of the hybrid film and the optimal mass fraction of HfC nanoparticles, which provide the greatest reduction in the electron work function, have been established. It has been found that partial charge transfer from the nanoparticle HfC to the carbon framework leads to changes in the density of electronic states, resulting in a change of both the Fermi energy and the height of the potential barrier for the emitting electron change, which leads to a decrease in the work function of the electron by 8–10%.
{"title":"Влияние наночастиц карбида гафния на эмиссионные свойства квази-2D-графен/нанотрубной пленки: исследование из первых принципов","authors":"О. Е. Глухова, М. М. Слепченков","doi":"10.21883/ftt.2023.08.56163.121","DOIUrl":"https://doi.org/10.21883/ftt.2023.08.56163.121","url":null,"abstract":"Using computer materials science methods based on first-principles approaches and high-performance computing, we have studied the effect of hafnium carbide (HfC) nanoparticles on the emission properties of graphene/nanotube hybrid films. The optimal distance between graphene/nanotube structures in the composition of the hybrid film and the optimal mass fraction of HfC nanoparticles, which provide the greatest reduction in the electron work function, have been established. It has been found that partial charge transfer from the nanoparticle HfC to the carbon framework leads to changes in the density of electronic states, resulting in a change of both the Fermi energy and the height of the potential barrier for the emitting electron change, which leads to a decrease in the work function of the electron by 8–10%.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83235456","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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