Pub Date : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241905
T. Koval, V. Tarakanov
Ion sources are used to modify surface layers of different materials and manufactured items. The minimization of radiation damage of treated surfaces sets the trend to decrease the ion beam energy (< 1.5 keV). The dynamic ion beam compensation and the ion beam plasma generation should be considered to control the transport of the metallic low-energy ion beam with ballistic focusing. The ion beam transport with ballistic focusing in the equipotential drift space is studied with numerical simulation by the 2.5D axial symmetric version of the KARAT electromagnetic PiC code. It is shown that the collector current changes to the pulsed mode when the injected ion energy $W < W_{c}$, where $W_{c}$ is critical energy that depends on the gas concentration and the injected ion current. The pulsed mode is the result of the virtual anode (VA) formation and its compensation by secondary electrons. In hemispherical drift space with curvature radius of 7.5 cm, the critical energy $W_{c}=2 text{keV}$ when the transported ion current $I_{b}=1 mathrm{A}$ and the gas concentration $n_{g}=10^{13} text{cm}^{-3}$. The oscillation frequency of the collector current depends on energy, the system geometry and the gas concentration. The oscillating mode of the collector current when decreasing the energy ($W < W_{c}$) of the transported ions is a result of the decreased role of secondary electrons in compensating the ion beam space charge. This leads to alternating formations: the VA formation when compensation of the space charge of the beam ions compensated. Plasma in the beam transport area is formed. A critical factor that impacts the ion beam transport mode is the electron heating under the increased plasma instability. All these processes are considered in the proposed PiC simulation. The time required to the ion-beam plasma formation and the period of the collector current pulses decrease as the transported ion energy $W$ and the gas concentration increase.
{"title":"Two Modes of Transportation of a High Current Ion Beam with Ballistic Focusing","authors":"T. Koval, V. Tarakanov","doi":"10.1109/EFRE47760.2020.9241905","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241905","url":null,"abstract":"Ion sources are used to modify surface layers of different materials and manufactured items. The minimization of radiation damage of treated surfaces sets the trend to decrease the ion beam energy (< 1.5 keV). The dynamic ion beam compensation and the ion beam plasma generation should be considered to control the transport of the metallic low-energy ion beam with ballistic focusing. The ion beam transport with ballistic focusing in the equipotential drift space is studied with numerical simulation by the 2.5D axial symmetric version of the KARAT electromagnetic PiC code. It is shown that the collector current changes to the pulsed mode when the injected ion energy $W < W_{c}$, where $W_{c}$ is critical energy that depends on the gas concentration and the injected ion current. The pulsed mode is the result of the virtual anode (VA) formation and its compensation by secondary electrons. In hemispherical drift space with curvature radius of 7.5 cm, the critical energy $W_{c}=2 text{keV}$ when the transported ion current $I_{b}=1 mathrm{A}$ and the gas concentration $n_{g}=10^{13} text{cm}^{-3}$. The oscillation frequency of the collector current depends on energy, the system geometry and the gas concentration. The oscillating mode of the collector current when decreasing the energy ($W < W_{c}$) of the transported ions is a result of the decreased role of secondary electrons in compensating the ion beam space charge. This leads to alternating formations: the VA formation when compensation of the space charge of the beam ions compensated. Plasma in the beam transport area is formed. A critical factor that impacts the ion beam transport mode is the electron heating under the increased plasma instability. All these processes are considered in the proposed PiC simulation. The time required to the ion-beam plasma formation and the period of the collector current pulses decrease as the transported ion energy $W$ and the gas concentration increase.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"170 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124745001","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241913
A. Sitnikov, V. Kozhevnikov, A. Kozyrev
This is a theoretical study of a new form of high-pressure gas discharge burning as a thin jet of plasma is not limited walls. This discharge is called “apokamp”. A two-dimensional flat model of the discharge is presented when a high-voltage trapezoidal pulse with amplitude of 15 kV and a base duration of $3 mumathrm{s}$ is applied to the electrodes. Results of modeling the discharge in an oxygen medium at atmospheric pressure with various rates of elementary processes, such as dissociation of oxygen molecules by electron impact and electron attachment, are presented. The inclusion of only four elementary processes in the theoretical model is sufficient for the formation of the apokamp. The spatial distributions of plasma number density and mean electron energy during the growth of the apokampic jet are obtained. Reduction of the electron attachment rate leads to increasing of the jet propagation velocity, and a decrease in the rate of direct dissociation greatly increases the diameter of the apokampic jet.
这是一种新的高压气体放电燃烧形式的理论研究，作为一种薄射流的等离子体是不受壁面限制的。这种放电称为“apokamp”。本文给出了一个振幅为15kv、基极持续时间为$3 mu mathm {s}$的高压梯形脉冲作用于电极时的二维平面放电模型。本文给出了在常压下氧介质中不同速率的放电过程的模拟结果，如氧分子的电子碰撞解离和电子附着。在理论模型中只包含四个基本过程就足以形成波坎。得到了等离子体数密度和平均电子能量在apokampic射流生长过程中的空间分布。电子附着率的降低导致射流传播速度的增加，而直接解离率的降低大大增加了apoampic射流的直径。
{"title":"Influence of Elementary Processes on Form of Apokampic Discharge","authors":"A. Sitnikov, V. Kozhevnikov, A. Kozyrev","doi":"10.1109/EFRE47760.2020.9241913","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241913","url":null,"abstract":"This is a theoretical study of a new form of high-pressure gas discharge burning as a thin jet of plasma is not limited walls. This discharge is called “apokamp”. A two-dimensional flat model of the discharge is presented when a high-voltage trapezoidal pulse with amplitude of 15 kV and a base duration of $3 mumathrm{s}$ is applied to the electrodes. Results of modeling the discharge in an oxygen medium at atmospheric pressure with various rates of elementary processes, such as dissociation of oxygen molecules by electron impact and electron attachment, are presented. The inclusion of only four elementary processes in the theoretical model is sufficient for the formation of the apokamp. The spatial distributions of plasma number density and mean electron energy during the growth of the apokampic jet are obtained. Reduction of the electron attachment rate leads to increasing of the jet propagation velocity, and a decrease in the rate of direct dissociation greatly increases the diameter of the apokampic jet.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130340920","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242115
O. Gradov, M. Gradova
This paper considers a multifactor process of self-organization of soft matter dissipative membraneous structures from the inorganic colloidal precursor under microwave irradiation. The above structures are formed due to dehydration accompanied by hydrolytic polymerization under the microwave field, leading to the formation of polymeric Fe(III) oxyhydroxides / oxides. The resulting structure morphology, as well as their chemical composition and degree of crystallinity depend on the irradiation time, microwave field power and concentration of the initial precursor. The structure formation in this case is a typical reaction-diffusion process with the emergent properties.
{"title":"Microwave-Induced Self-Organization of Liophilic Colloids During Enhanced Hydrolytic Polymerization","authors":"O. Gradov, M. Gradova","doi":"10.1109/EFRE47760.2020.9242115","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242115","url":null,"abstract":"This paper considers a multifactor process of self-organization of soft matter dissipative membraneous structures from the inorganic colloidal precursor under microwave irradiation. The above structures are formed due to dehydration accompanied by hydrolytic polymerization under the microwave field, leading to the formation of polymeric Fe(III) oxyhydroxides / oxides. The resulting structure morphology, as well as their chemical composition and degree of crystallinity depend on the irradiation time, microwave field power and concentration of the initial precursor. The structure formation in this case is a typical reaction-diffusion process with the emergent properties.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126895052","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241945
A. Chumaevskii, K. Osipovich, K. Kalashnikov, A. Panfilov, A. Gusarova, Evgeny Knjazhev
The results of the work show that a hardened layer with almost complete absence of pores and delamination and increased mechanical properties appears in the surface layer at the depth of processing. The structure of the surface layer is similar to that obtained by friction stir processing of flat rolled products. Mechanical tensile testing of the gradient zone between processed and unprocessed material shows that fracture occurs mainly along the boundary between the processing zone and the additively manufactured material. Thus, the combination of wire-feed electron-beam additive technology and friction stir processing makes it possible to obtain components with a hardened surface layer of the finished product.
{"title":"Hardening of Aluminium Alloy 5556 and Copper C11000 Obtained by the Additive Electron-Beam Method with the Following Friction Stir Processing","authors":"A. Chumaevskii, K. Osipovich, K. Kalashnikov, A. Panfilov, A. Gusarova, Evgeny Knjazhev","doi":"10.1109/EFRE47760.2020.9241945","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241945","url":null,"abstract":"The results of the work show that a hardened layer with almost complete absence of pores and delamination and increased mechanical properties appears in the surface layer at the depth of processing. The structure of the surface layer is similar to that obtained by friction stir processing of flat rolled products. Mechanical tensile testing of the gradient zone between processed and unprocessed material shows that fracture occurs mainly along the boundary between the processing zone and the additively manufactured material. Thus, the combination of wire-feed electron-beam additive technology and friction stir processing makes it possible to obtain components with a hardened surface layer of the finished product.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123944632","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242196
P. Golubkov, E. Pecherskaya, D. Artamonov, T. Zinchenko, V. V. Antipenko, A. V. Pecherskiy
A model that allows obtaining a systematic analytical description of the micro-arc oxidation (MAO) process parameters influence on the microdischarges characteristics using the Ishikawa cause-effect diagram, graph theory, and set theory is proposed. Expressions for the model parameters characterizing the electrolyte conductivity and the microdischarges power are obtained. The proposed model is universal and can be used to study any multifactorial processes or complex objects.
{"title":"Study of Factors Influencing the Characteristics of Micro-Discharges in the Micro-Arc Oxidation Process","authors":"P. Golubkov, E. Pecherskaya, D. Artamonov, T. Zinchenko, V. V. Antipenko, A. V. Pecherskiy","doi":"10.1109/EFRE47760.2020.9242196","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242196","url":null,"abstract":"A model that allows obtaining a systematic analytical description of the micro-arc oxidation (MAO) process parameters influence on the microdischarges characteristics using the Ishikawa cause-effect diagram, graph theory, and set theory is proposed. Expressions for the model parameters characterizing the electrolyte conductivity and the microdischarges power are obtained. The proposed model is universal and can be used to study any multifactorial processes or complex objects.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124314580","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241944
Y. Akhmadeev, I. Lopatin, Y. Ivanov, E. Petrikova, M. Rygina
The work is devoted to the identification and analysis of the regularities of the modification of the elemental and phase composition, defective substructure and mechanical properties of carbon steel subjected to complex processing, combining the saturation of the surface layer of the samples with aluminum atoms (alitization) and subsequent nitriding. The material used for the study was carbon steels AISI 5135 and AISI 1020, which in the initial state have a ferrite-pearlite structure. The complex modification was carried out in a single vacuum space on a TRIO installation with a chamber size of $600 times 600 times 600$ mm, additionally equipped with a switching block to implement the elion (electron and ion) mode. Alitization was carried out at a temperature of 963 K and a time of 4 hours. Subsequent nitriding of the alitized layer was carried out at a temperature of 803 K for 2 hours. The arc evaporator cathode was made of ASTM 1100 aluminum alloy (98.8% Al). As a result of the performed studies, it was found that the thickness of the modified layer reaches $80 mumathrm{m}$. The hardness of steel is maximum on the modificated surface and exceeds the hardness of the initial material by 4 times (steel AISI 1020) and 2.7 times (steel AISI 5135). It is shown that the complex modification of carbon steel is accompanied by the formation of a multiphase state containing iron nitrides of the composition Fe4N, Fe3N and aluminum - AlN.
{"title":"Complex Method of Structural Steel Treatment","authors":"Y. Akhmadeev, I. Lopatin, Y. Ivanov, E. Petrikova, M. Rygina","doi":"10.1109/EFRE47760.2020.9241944","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241944","url":null,"abstract":"The work is devoted to the identification and analysis of the regularities of the modification of the elemental and phase composition, defective substructure and mechanical properties of carbon steel subjected to complex processing, combining the saturation of the surface layer of the samples with aluminum atoms (alitization) and subsequent nitriding. The material used for the study was carbon steels AISI 5135 and AISI 1020, which in the initial state have a ferrite-pearlite structure. The complex modification was carried out in a single vacuum space on a TRIO installation with a chamber size of $600 times 600 times 600$ mm, additionally equipped with a switching block to implement the elion (electron and ion) mode. Alitization was carried out at a temperature of 963 K and a time of 4 hours. Subsequent nitriding of the alitized layer was carried out at a temperature of 803 K for 2 hours. The arc evaporator cathode was made of ASTM 1100 aluminum alloy (98.8% Al). As a result of the performed studies, it was found that the thickness of the modified layer reaches $80 mumathrm{m}$. The hardness of steel is maximum on the modificated surface and exceeds the hardness of the initial material by 4 times (steel AISI 1020) and 2.7 times (steel AISI 5135). It is shown that the complex modification of carbon steel is accompanied by the formation of a multiphase state containing iron nitrides of the composition Fe4N, Fe3N and aluminum - AlN.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124477945","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242105
N. Romanova, S. Gizatulin, D. Dyussambayev, U. Koztayeva, A. Shaimerdenov, Naoki Mizuta, J. Sumita, T. Shibata, N. Sakaba, Takashi Osaki, H. Kato, Shoichi Izawa, Takenori Muto
Oxidation-induced damage in nuclear reactor materials is one of the important safety issues in accidents. In particular, graphite materials are used for the internal components of a high temperature gas-cooled reactor (HTGR) due to its excellent neutron, thermal and mechanical properties. Graphite is used as a structural material for fuel elements, as well as neutron moderator and reflector. In the case of an accident with ingress of air or water, one of the most serious problems would be the oxidation of graphite material. To eliminate this, it is proposed to use the graphite having an oxidation-resistant protective coating based on silicon carbide (SiC). Studies of the impact of high temperature and neutron irradiation to oxidation resistance properties of the graphite coated with SiC were carried out at INP (Kazakhstan) jointly with JAEA (Japan). The specimens from four Japanese manufacturers were irradiated in the WWR-K reactor for 200 EFPDs. The maximum fast neutron fluency (En> 0.18 MeV) comprised 1.1·1025 m-2. After irradiation, the specimens were tried for oxidation in the environment of helium and 20% of oxygen at 1200°C. The release of carbon dioxide (CO2) was monitored during the test. Only one specimen, from manufacturer “X”, was found to to be resistant to oxidation – no CO2 emission was not detected. Three other specimens were oxidized. The work is devoted to this test.
{"title":"Oxidative Resistance of Irradiated Graphite Coated with Silicon Carbide","authors":"N. Romanova, S. Gizatulin, D. Dyussambayev, U. Koztayeva, A. Shaimerdenov, Naoki Mizuta, J. Sumita, T. Shibata, N. Sakaba, Takashi Osaki, H. Kato, Shoichi Izawa, Takenori Muto","doi":"10.1109/EFRE47760.2020.9242105","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242105","url":null,"abstract":"Oxidation-induced damage in nuclear reactor materials is one of the important safety issues in accidents. In particular, graphite materials are used for the internal components of a high temperature gas-cooled reactor (HTGR) due to its excellent neutron, thermal and mechanical properties. Graphite is used as a structural material for fuel elements, as well as neutron moderator and reflector. In the case of an accident with ingress of air or water, one of the most serious problems would be the oxidation of graphite material. To eliminate this, it is proposed to use the graphite having an oxidation-resistant protective coating based on silicon carbide (SiC). Studies of the impact of high temperature and neutron irradiation to oxidation resistance properties of the graphite coated with SiC were carried out at INP (Kazakhstan) jointly with JAEA (Japan). The specimens from four Japanese manufacturers were irradiated in the WWR-K reactor for 200 EFPDs. The maximum fast neutron fluency (En> 0.18 MeV) comprised 1.1·1025 m-2. After irradiation, the specimens were tried for oxidation in the environment of helium and 20% of oxygen at 1200°C. The release of carbon dioxide (CO2) was monitored during the test. Only one specimen, from manufacturer “X”, was found to to be resistant to oxidation – no CO2 emission was not detected. Three other specimens were oxidized. The work is devoted to this test.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124088784","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241999
A. Chumaevskii, T. Kalashnikova, A. Gusarova, Evgeny Knjazhev, K. Kalashnikov, A. Panfilov
In the work, the structure formation of polymetallic samples from copper and an aluminum alloy produced by the electron-beam additive technology is studied. The basic types of defects are defined and the conditions of their formation are identified. Structural features of a gradient transition zone from copper to the zone of a solid solution of aluminum in copper, and to the zone of intermetallic phase formation are investigated. The complex and heterogeneous structure of the gradient zone is revealed. It is found that different cracks occur during the formation of large intermetallic zones even in the modes with optimal parameters.
{"title":"The Structure Organization and Defect Formation of Cu-Al System Polymetallic Materials Produced by the Electron-Beam Additive Technology","authors":"A. Chumaevskii, T. Kalashnikova, A. Gusarova, Evgeny Knjazhev, K. Kalashnikov, A. Panfilov","doi":"10.1109/EFRE47760.2020.9241999","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241999","url":null,"abstract":"In the work, the structure formation of polymetallic samples from copper and an aluminum alloy produced by the electron-beam additive technology is studied. The basic types of defects are defined and the conditions of their formation are identified. Structural features of a gradient transition zone from copper to the zone of a solid solution of aluminum in copper, and to the zone of intermetallic phase formation are investigated. The complex and heterogeneous structure of the gradient zone is revealed. It is found that different cracks occur during the formation of large intermetallic zones even in the modes with optimal parameters.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126488872","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242124
S. Kiselev, V. Pustovarov
This paper reports the spectroscopic properties of praseodymium-doped potassium lutetium double phosphates, KLuP2O7:Pr3+ (1%). Spectra of photoluminescence, photoluminescence excitation, X-ray excited luminescence and pulse cathodoluminescence, thermally stimulated luminescence were investigated. KLuP2O7:Pr3+ showed Pr3+ emission connected both with high intensity interconfigurational $4f^{1}5d^{1} rightarrow 4f^{2}$ transitions (UV bands in region of 250–320 nm), intraconfigurational $4f^{2} rightarrow 4f^{2}$ transitions (weak lines in vision spectral region) and Stocks defect-related luminescence. Upon both UV intra-center and band-to-band excitation with ionizing radiation, emission spectra of KLuP2O7:Pr3+ are dominated by Pr3+ interconfigurational $4f^{1}5d^{1} rightarrow 4f^{2}$ radiative transitions. Luminescence decay kinetics measurements established decay time $tau approx 19$ ns at room temperature. The study of thermally stimulated luminescence demonstrates effective light storage. Parameters of charge carriers' traps were calculated: $Delta E_{1} = 1.1$ eV (for peak at 352 K) and $Delta E_{2} = 1.3$ eV (for peak at 388 K).
本文报道了掺镨镥双磷酸钾KLuP2O7:Pr3+(1)的光谱性质%). Spectra of photoluminescence, photoluminescence excitation, X-ray excited luminescence and pulse cathodoluminescence, thermally stimulated luminescence were investigated. KLuP2O7:Pr3+ showed Pr3+ emission connected both with high intensity interconfigurational $4f^{1}5d^{1} rightarrow 4f^{2}$ transitions (UV bands in region of 250–320 nm), intraconfigurational $4f^{2} rightarrow 4f^{2}$ transitions (weak lines in vision spectral region) and Stocks defect-related luminescence. Upon both UV intra-center and band-to-band excitation with ionizing radiation, emission spectra of KLuP2O7:Pr3+ are dominated by Pr3+ interconfigurational $4f^{1}5d^{1} rightarrow 4f^{2}$ radiative transitions. Luminescence decay kinetics measurements established decay time $tau approx 19$ ns at room temperature. The study of thermally stimulated luminescence demonstrates effective light storage. Parameters of charge carriers' traps were calculated: $Delta E_{1} = 1.1$ eV (for peak at 352 K) and $Delta E_{2} = 1.3$ eV (for peak at 388 K).
{"title":"Luminescence of KLuP2O7 Powder Doped with Pr3+ Ions upon Different Types of Excitation","authors":"S. Kiselev, V. Pustovarov","doi":"10.1109/EFRE47760.2020.9242124","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242124","url":null,"abstract":"This paper reports the spectroscopic properties of praseodymium-doped potassium lutetium double phosphates, KLuP<sub>2</sub>O<sub>7</sub>:Pr<inf>3+</inf> (1%). Spectra of photoluminescence, photoluminescence excitation, X-ray excited luminescence and pulse cathodoluminescence, thermally stimulated luminescence were investigated. KLuP<sub>2</sub>O<sub>7</sub>:Pr<inf>3+</inf> showed Pr<inf>3+</inf> emission connected both with high intensity interconfigurational <tex>$4f^{1}5d^{1} rightarrow 4f^{2}$</tex> transitions (UV bands in region of 250–320 nm), intraconfigurational <tex>$4f^{2} rightarrow 4f^{2}$</tex> transitions (weak lines in vision spectral region) and Stocks defect-related luminescence. Upon both UV intra-center and band-to-band excitation with ionizing radiation, emission spectra of KLuP<sub>2</sub>O<sub>7</sub>:Pr<inf>3+</inf> are dominated by Pr<inf>3+</inf> interconfigurational <tex>$4f^{1}5d^{1} rightarrow 4f^{2}$</tex> radiative transitions. Luminescence decay kinetics measurements established decay time <tex>$tau approx 19$</tex> ns at room temperature. The study of thermally stimulated luminescence demonstrates effective light storage. Parameters of charge carriers' traps were calculated: <tex>$Delta E_{1} = 1.1$</tex> eV (for peak at 352 K) and <tex>$Delta E_{2} = 1.3$</tex> eV (for peak at 388 K).","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126450444","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242139
Zhakyp Karipbaeyev, V. Lisitsyn, G. Alpyssova, T. Grechkina, A. Kukenova, D. Mussakhanov, Vladimir Shenarsheev
This paper presents the results of studies of the luminescent characteristics of 4 series of samples: YAG:Ce, YAGG:Ce ceramics synthesized in the field of high-power electron fluxes aimed at establishing the reproducibility of the synthesis results. Measured the kinetic characteristics of photoluminescence decay of ceramic samples. Differences in luminescence characteristics are different in samples of different series, but do not exceed 1.5%.
{"title":"The Reproducibility of YAG:Ce Ceramics Formed by Electron Beam Assisted Synthesis","authors":"Zhakyp Karipbaeyev, V. Lisitsyn, G. Alpyssova, T. Grechkina, A. Kukenova, D. Mussakhanov, Vladimir Shenarsheev","doi":"10.1109/EFRE47760.2020.9242139","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242139","url":null,"abstract":"This paper presents the results of studies of the luminescent characteristics of 4 series of samples: YAG:Ce, YAGG:Ce ceramics synthesized in the field of high-power electron fluxes aimed at establishing the reproducibility of the synthesis results. Measured the kinetic characteristics of photoluminescence decay of ceramic samples. Differences in luminescence characteristics are different in samples of different series, but do not exceed 1.5%.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128040281","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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