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Reduction of impurity sources in Si crystal growth system with electron gun beam heating 电子束加热硅晶体生长体系中杂质源的减少
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2021-01-01 DOI: 10.3952/physics.v61i3.4518
A. Kravtsov, J. Virbulis, A. Krauze
{"title":"Reduction of impurity sources in Si crystal growth system with electron gun beam heating","authors":"A. Kravtsov, J. Virbulis, A. Krauze","doi":"10.3952/physics.v61i3.4518","DOIUrl":"https://doi.org/10.3952/physics.v61i3.4518","url":null,"abstract":"A new series of experiments was conducted to determine the source of impurities in the process of silicon crystal growth with electron beam heating. A gas-dynamic window was placed between the electron gun and growth chamber. Also positively-charged traps were placed along the crucible to reduce the number of electrons hitting the chamber and the crucible. Five experiments were conducted: two with the window, two with charge traps, and one with both the window and charge traps. The analysis of obtained samples showed that the gas-dynamic window decreases the content of Al, Cu, Fe, Cr and O2, and the trap, used in the experiments, decreases the content of Fe, Cr and Cu in residues of the melt. The content of all impurities, except Al, is close to the goal level. Al impurities come only from the gun, but the gas-dynamic window cannot eliminate them completely. It seems that Al impurities come either as neutral atoms carried by the gas or as positively charged ions. To reduce these impurities, a separation of the Al flow from the beam by the magnetic field is proposed.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70032559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Effect of spring grass fires on indoor air quality in air-conditioned office building 春季草地火灾对空调办公楼室内空气质量的影响
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2021-01-01 DOI: 10.3952/physics.v61i3.4519
J. Pauraitė, I. Garbarienė, A. Minderytė, V. Dudoitis, G. Mainelis, L. Davulienė, I. Uogintė, K. Plauškaitė, S. Byčenkienė
{"title":"Effect of spring grass fires on indoor air quality in air-conditioned office building","authors":"J. Pauraitė, I. Garbarienė, A. Minderytė, V. Dudoitis, G. Mainelis, L. Davulienė, I. Uogintė, K. Plauškaitė, S. Byčenkienė","doi":"10.3952/physics.v61i3.4519","DOIUrl":"https://doi.org/10.3952/physics.v61i3.4519","url":null,"abstract":"Open biomass burning (OBB) is a significant air pollution source, but it is still not clear to what extent OBB events affect indoor air quality [1]. Outdoor and indoor measurements of submicron particulate matter (PM1) were conducted on 25–29 April (2019) in the capital city Vilnius (Lithuania). Fires from neighbouring countries (Belarus, Ukraine and Russia) and in the vicinity of Vilnius broke out during the measurement campaign. The temporal evolution and transport of OBB plume were investigated by combining the air mass backward trajectory analysis and fire satellite observation (MODIS) database. Measurements of the PM1 chemical composition in real-time were performed using an aerosol chemical speciation monitor (ACSM) and an aethalometer. Organic matter was the clearly dominant component, accounting for >70%, in both indoor and outdoor PM1. The air filtering system of the office building removed approximately up to 55% of PM1. Despite a significantly lower PM1 pollution level in the office, highly acidic indoor PM1 could have harmful effects on the human health. Source apportionment of particulate carbonaceous matter revealed a significant importance of OBB-related particles (average 56%) to indoor air.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70032642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
In search of an artificial morphotropic phase boundary: Lead free barium titanate based composites 寻找人工形态变化相边界：无铅钛酸钡基复合材料
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2020-12-13 DOI: 10.3952/physics.v60i4.4358
S. Balčiu̅nas, M. Ivanov, J. Banys, S. Ueno, S. Wada
{"title":"In search of an artificial morphotropic phase boundary: Lead free barium titanate based composites","authors":"S. Balčiu̅nas, M. Ivanov, J. Banys, S. Ueno, S. Wada","doi":"10.3952/physics.v60i4.4358","DOIUrl":"https://doi.org/10.3952/physics.v60i4.4358","url":null,"abstract":"Broadband dielectric spectroscopy was used to study potassium niobate (KN) and barium titanate (BT) core– shell-like composites. KN shell was obtained using a solvothermal reaction method. High frequency results show a huge anomaly that is associated with electro-mechanical coupling. We tried to extract spontaneous polarization values using a theoretical model. We also observed little or no evidence of KN-related phase transitions in the dielectric spectra, although infrared measurements showed typical KN spectral features. Furthermore, we show that a small change in the sintering process allows tuning of dielectric permittivity by an order of magnitude.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43455841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Long-time drift induced changes in electrical characteristics of graphene–metal contacts 石墨烯-金属接触电特性的长时间漂移变化
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2020-12-13 DOI: 10.3952/physics.v60i4.4359
A. Sakavičius, V. Agafonov, V. Bukauskas, T. Daugalas, M. Kamarauskas, A. Lukša, V. Nargelienė, G. Niaura, M. Treideris, A. Šetkus
{"title":"Long-time drift induced changes in electrical characteristics of graphene–metal contacts","authors":"A. Sakavičius, V. Agafonov, V. Bukauskas, T. Daugalas, M. Kamarauskas, A. Lukša, V. Nargelienė, G. Niaura, M. Treideris, A. Šetkus","doi":"10.3952/physics.v60i4.4359","DOIUrl":"https://doi.org/10.3952/physics.v60i4.4359","url":null,"abstract":"Chemical vapour deposition (CVD) graphene is commonly recognized as promising 2D material for development of electronic devices. However, the long-term drift of electrical parameters still requires deeper understanding before the technological means can be selected for an individual type of the devices. In this work, the changes in the electrical resistance were investigated over long time in the planar samples based on the CVD graphene with Au and Ni contacts. The samples were arranged as arrays of the resistors on a silicon substrate covered with a 250 nm layer of thermally grown silicon dioxide. The annealing in pure argon gas flow at 573 K was used to return the electrical properties of samples to the initial state. The effects of drift and annealing were compared for the three parts of structures, namely the electrical contact, the graphene sheet and the edge of the metal film with a hanging graphene sheet. For these parts, the resistance changes were related to the strain and doping of supported and hanged parts of the graphene sheet. Raman spectroscopy and Kelvin force probe microscopy were used to characterize charge doping, strain and work function in the graphene. The drift was explained in terms of the most prominent changes in the doping, strain and work function detected within the edge zone of the contact. It was proved that the annealing significantly changed the p-type doping and work function in the graphene layer in this edge zone. The properties were almost independent of test conditions in the SiO2 supported graphene. The changes in the contact parameters produced by drift mechanisms were proved being reversible under proper annealing conditions.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46463513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Broadband and infrared spectroscopy of Ag0.98Li0.02NbO3 ceramics Ag0.98Li0.02NbO3陶瓷的宽带和红外光谱
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2020-12-13 DOI: 10.3952/physics.v60i4.4360
E. Palaimiene, J. Macutkevič, J. Banys, I. Gruszka, A. Kania
{"title":"Broadband and infrared spectroscopy of Ag0.98Li0.02NbO3 ceramics","authors":"E. Palaimiene, J. Macutkevič, J. Banys, I. Gruszka, A. Kania","doi":"10.3952/physics.v60i4.4360","DOIUrl":"https://doi.org/10.3952/physics.v60i4.4360","url":null,"abstract":"The dielectric properties of Ag0.98Li0.02NbO3 (ALN2) ceramics were investigated in a broad frequency range (20 Hz – 60 THz). The dielectric spectra of ALN2 ceramics are mainly impacted by electrical conductivity at higher temperatures (above 400 K) and low frequencies (below 100 Hz), ferroelectric domains below ferroelectric phase transition temperature Tc = 330 K and at low frequencies (below 1 MHz), and contribution of the soft ferroelectric mode, the frequency of which is below 50 cm–1. All phononic modes are slightly temperature dependent, thus confirming the influence of Ag, O and Li ions dynamics on the phase transitions. However, the most important contribution to the dynamics of phase transition is made by Nb ions. Ceramics exhibits a huge value of dielectric permittivity and relatively low losses in a microwave frequency range (ε΄ ≈ 250 and ε˝ ≈ 20 at 10 GHz and room temperature), indicating that it is suitable for various microwave dielectric applications.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48987937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
LiSAF: an efficient and durable nonlinear material for supercontinuum generation in the ultraviolet LiSAF:一种高效耐用的非线性材料，用于在紫外线下产生超连续统
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2020-12-13 DOI: 10.3952/physics.v60i4.4357
A. Šuminienė, V. Jukna, R. Šuminas, G. Tamosauskas, M. Vengris, A. Dubietis
{"title":"LiSAF: an efficient and durable nonlinear material for supercontinuum generation in the ultraviolet","authors":"A. Šuminienė, V. Jukna, R. Šuminas, G. Tamosauskas, M. Vengris, A. Dubietis","doi":"10.3952/physics.v60i4.4357","DOIUrl":"https://doi.org/10.3952/physics.v60i4.4357","url":null,"abstract":"We have experimentally studied supercontinuum generation in an undoped LiSAF crystal using ultraviolet, visible and near infrared pump pulses provided by fundamental and second harmonics of amplified femtosecond Ti:sapphire and Yb:KGW lasers. We have found that the optical degradation of the crystal, manifested by gradual narrowing of the supercontinuum spectrum, starts much faster using infrared pump pulses. This is attributed to the role of impact ionization, which increases with increasing the pump wavelength. The most reliable operation is achieved with the shortest pump wavelength of 400 nm (the second harmonic of a Ti:sapphire laser), where LiSAF produces a stable, almost 1.3 octave-spanning supercontinuum spectrum with a short-wavelength cut-off at 252 nm and shows no apparent optical degradation for one hour of continuous operation at 500 Hz repetition rate without crystal translation.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44675514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Negative flow of energy in a mechanical wave 机械波中的负能量流
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2020-10-29 DOI: 10.3952/physics.v60i4.4356
A. Matulis, A. Acus
{"title":"Negative flow of energy in a mechanical wave","authors":"A. Matulis, A. Acus","doi":"10.3952/physics.v60i4.4356","DOIUrl":"https://doi.org/10.3952/physics.v60i4.4356","url":null,"abstract":"A classical system, which is analogous to the quantum one with a backflow of probability, is proposed. The system consists of a chain of masses interconnected by springs and attached by other springs to fixed supports. Thanks to the last springs the cutoff frequency and dispersion appears in the spectrum of waves propagating along the chain. It is shown that this dispersion contributes to the appearance of a backflow of energy. In the case of the interference of two waves, the magnitude of this backflow is an order of magnitude higher than the value of probability backflow in the mentioned quantum problem. The equation of Green’s function is considered and it is shown that the backflow of energy is also possible when the system is excited by two consecutive short pulses. This classical backflow phenomenon is explained by the branching of energy flow to local modes that is confirmed by the results for the forced damped oscillator. It is shown that even in such a simple system the backflow of energy takes place (both instantaneous and average).","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42072496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
One SYK single electron transistor 一个SYK单电子晶体管
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2020-08-03 DOI: 10.3952/physics.v60i3.4305
D. Khveshchenko
{"title":"One SYK single electron transistor","authors":"D. Khveshchenko","doi":"10.3952/physics.v60i3.4305","DOIUrl":"https://doi.org/10.3952/physics.v60i3.4305","url":null,"abstract":"We study the behaviour of a single electron transistor (SET) represented by a dissipative tunnel junction between a pair of quantum dots described by two (possibly, different) Sachdev–Ye–Kitaev (SYK) models. A combined influence of the soft collective charge and energy modes on charge transport is discussed, alongside the competing effects of the Coulomb blockade and emergent Kondo resonances which might all conspire to result in a non-monotonic behaviour of the system’s conductance.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45714216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Efros–Shklovskii hopping in the electronic transport in 2D p-GaAs 二维p-GaAs中电子输运中的Efros-Shklovskii跳变
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2020-08-03 DOI: 10.3952/physics.v60i3.4303
S. Dlimi, L. Limouny, J. Hemine, A. Echchelh, A. E. Kaaouachi
{"title":"Efros–Shklovskii hopping in the electronic transport in 2D p-GaAs","authors":"S. Dlimi, L. Limouny, J. Hemine, A. Echchelh, A. E. Kaaouachi","doi":"10.3952/physics.v60i3.4303","DOIUrl":"https://doi.org/10.3952/physics.v60i3.4303","url":null,"abstract":"a Physics Department, Faculty of Sciences, University Ibn Zohr, B. P 8106, Hay Dakhla, 80000 Agadir, Morocco b Laboratoire des systèmes électroniques, traitement de l’information, mécanique et énergétique, Faculté des Sciences, Université Ibn Tofaïl, Kénitra, Morocco c Laboratory of Energetic Engineering and Materials, Faculty of Sciences, Ibn Tofaïl University, Kénitra, Morocco Email: dlimi1975@gmail.com","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45552159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Optimization of wide-field second-harmonic generation microscopy for fast imaging of large sample areas in biological tissues 用于生物组织大样本区域快速成像的宽视场二次谐波生成显微镜优化
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2020-08-03 DOI: 10.3952/physics.v60i3.4301
A. Dementjev, R. Rudys, R. Karpicz, D. Rutkauskas
{"title":"Optimization of wide-field second-harmonic generation microscopy for fast imaging of large sample areas in biological tissues","authors":"A. Dementjev, R. Rudys, R. Karpicz, D. Rutkauskas","doi":"10.3952/physics.v60i3.4301","DOIUrl":"https://doi.org/10.3952/physics.v60i3.4301","url":null,"abstract":"Second-harmonic generation (SHG) microscopy is a label-free imaging method that can be used to visualize the detailed arrangement of collagen structures in biological tissues. Here, we sought to optimize the speed of microscopic SHG image acquisition of macroscopic fixed tissue sample areas by employing the wide-field imaging with a high power and medium, 1 MHz pulse repetition frequency laser in combination with a mechanical sample scanning. Unlike in the conventional laser-scanning microscopy, the optimum of the wide-field acquisition entails an interplay between the size of the illuminated area and the intensity of the generated signal. We delineate quantitative procedures to set the image parameters for the maximum speed of the tiled image acquisition, and also describe the possible optimization of the laser parameters for further enhancement of the speed of acquisition.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45513694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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