Canadian Journal of Physics最新文献_第6页

Impact of fluorine and chlorine doping on the structural, electronic and optical properties of SnO2 : First-principles study 氟氯掺杂对SnO2结构、电子和光学性质的影响:第一性原理研究

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-05-08 DOI: 10.1139/cjp-2022-0295

F. Larbi, S. Bourahla, S. Kouadri Moustefai, F. Elagra

{"title":"Impact of fluorine and chlorine doping on the structural, electronic and optical properties of SnO2 : First-principles study","authors":"F. Larbi, S. Bourahla, S. Kouadri Moustefai, F. Elagra","doi":"10.1139/cjp-2022-0295","DOIUrl":"https://doi.org/10.1139/cjp-2022-0295","url":null,"abstract":"In this work, we carried out in depth the structural, electronic and optical properties of intrinsic, fluorine (F) and chlorine (Cl) doped SnO2, using a pseudo-potential plane-wave scheme in the framework of the density functional theory. We found that the substitution of oxygen by F or Cl elements slightly modified the crystalline parameters without altering the stability of SnO2 compounds. The doping of tin oxide by these two halogens is confirmed by the displacement of the Fermi level position to the conduction band. Consequently, the doped materials are strongly degenerate as illustrated by the Moss-Burstein shift: 2.310 eV and 2.332 eV for F:SnO2 and Cl:SnO2 respectively. On the other hand, the density of states and Mulliken population analysis show that the covalent character of Sn-O bond is maintained after doping, while Sn-X (X=F or Cl) formed bond reveals an ionic nature. In terms of optical properties after doping, intrinsic SnO2 exhibits low absorption while the doped ones are transparent in the visible range, making them more efficient in photovoltaic applications. Moreover, in the ultraviolet (UV) scale, pure and doped tin oxide compounds show better absorption, which may be beneficial for use in devices of protection against UV light and UV absorbers or sensors. Finally, the plasma frequencies of 28.22 eV, 29.16 eV and 27.67 eV for pure, F and Cl doped SnO2, respectively, were obtained.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"30 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87103891","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

Measurements of the L-shell x-ray emission of ﬂuorinelike europium 类氟铕l壳层x射线辐射的测量

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-05-08 DOI: 10.1139/cjp-2022-0041

D. Panchenko, P. Beiersdorfer, N. Hell, G. Brown, R. Kelley, C. Kilbourne, F. Porter

引用次数: 0

Boron Neutron Capture Therapy in the New Age of Accelerator-Based Neutron Production and Preliminary Progress in Canada 加速器中子产生新时代的硼中子捕获疗法及加拿大的初步进展

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-04-19 DOI: 10.1139/cjp-2022-0266

D. Dziura, Sana Tabbassum, Amanda MacNeil, D. Maharaj, R. Laxdal, O. Kester, M. Pan, H. Kumada, D. Marquardt

{"title":"Boron Neutron Capture Therapy in the New Age of Accelerator-Based Neutron Production and Preliminary Progress in Canada","authors":"D. Dziura, Sana Tabbassum, Amanda MacNeil, D. Maharaj, R. Laxdal, O. Kester, M. Pan, H. Kumada, D. Marquardt","doi":"10.1139/cjp-2022-0266","DOIUrl":"https://doi.org/10.1139/cjp-2022-0266","url":null,"abstract":"Each year more than 3,000 Canadians are diagnosed with brain cancers like glioblastoma multiforme or recurrent head and neck cancers which are difficult to treat with conventional radiotherapy techniques. One of the most clinically promising treatments for these cancers is boron neutron capture therapy (BNCT). This procedure involves selectively introducing a boron delivery agent into tumor cells and irradiating them with a neutron beam, which kills the cancer cells due to the high-LET radiation produced by the 10B(n,α)7Li capture reaction. The theory of BNCT has been around for a long time since 1936, but has historically been limited by poor boron delivery agents and nonoptimal neutron source facilities. Although significant improvements have been made in both of these domains, it is mainly the advancements of accelerator-based neutron sources that has led to the expansion of over 20 new BNCT facilities worldwide in the past decade. Additionally in this work, PHITS (Particle and Heavy Ion Transport Code System) simulations, in collaboration with the University of Tsukuba, were performed to examine the effectiveness of the Ibaraki-Boron Neutron Capture Therapy (iBNCT) beam shaping assembly (BSA) to moderate a neutron beam suitable for BNCT at the proposed PC-CANS (Prototype Canadian Compact Accelerator-based Neutron Source) site, which uses a similar but slightly higher energy 10 MeV proton accelerator with a 1 mA average current. The advancements of compact acceleratorbased neutron sources in recent decades has enabled significant improvements in BNCT technologies, allowing it to become a more viable clinical treatment option.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"8 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72488479","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

Application of X-rays to interpret alloying effects on the 3d and 4s4p electron populations of nickel boron nitrogen metal matrix composites 应用x射线解释合金化对镍硼氮金属基复合材料3d和4s4p电子居群的影响

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-04-17 DOI: 10.1139/cjp-2022-0336

O. K. Köksal

引用次数: 0

Radioactive decay properties of superheavy element Z= 119 超重元素Z= 119的放射性衰变性质

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-04-17 DOI: 10.1139/cjp-2022-0301

N. Sowmya, A. M. Nagaraja, H. C. Manjunatha

引用次数: 0

Fermi velocity and effective mass of quasiparticles in bilayer phosphorene nanoribbons 双层磷烯纳米带中准粒子的费米速度和有效质量

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-04-14 DOI: 10.1139/cjp-2022-0037

Morad Ali Peyvand, Bahman Ravaee, M. Zare

{"title":"Fermi velocity and effective mass of quasiparticles in bilayer phosphorene nanoribbons","authors":"Morad Ali Peyvand, Bahman Ravaee, M. Zare","doi":"10.1139/cjp-2022-0037","DOIUrl":"https://doi.org/10.1139/cjp-2022-0037","url":null,"abstract":"Based on the Green’s function approach in combination with the tight-binding approximation, we have investigated the electronic properties of zigzag bilayer phosphorene nanoribbons (ZBLPNRs). A complete and fully reversible metal to semiconductor or insulator phase transition, has been observed via tuning a perpendicular electric field. We explain the effect of the interlayer hopping parameter on the electronic characterizations, namely, the energy band-gap, Fermi velocity and effective mass of carriers in biased ZBLPNRs. In the presence of the interlayer hopping term, the band structure of a ZBLPNR in the vicinity of the Fermi level has a form of two tilted Dirac cones, while, in the absence of it, the created cones are not tilted. Besides, the bands above and below the Fermi level are not symmetric,{it i.e.}, there is no electron-hole symmetry for both limits of the interlayer coupling. A remarkable tuning of both the Fermi velocity and the reciprocal effective mass can be observed by adjusting the external bias voltage. At certain critical bias voltages, the band edge reciprocal masses and carrier velocities become zero, {it i.e.}, the electrons exhibit a localization behaviour. This phenomenon indeed is a transition from massive to massless Dirac fermions and vice versa. The possibility of simultaneous control of the thermal and magnetic properties using an electric agent, which can be realized experimentally by using an perpendicular potential difference, open up possibilities for low power consumed thermomagnetic devices based on ZBLPNRs.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"93 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83861943","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

Approximate solutions of the transcendental equation for the square quantum wells by finding the real root of the cubic equation. 通过求三次方程的实根求平方量子阱超越方程的近似解。

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-04-14 DOI: 10.1139/cjp-2023-0004

J. Noël, L. Levesque

引用次数: 0

String cosmological scenario in periodic time-varying deceleration parameter in Lyra geometry 天琴座几何中周期时变减速参数中的弦宇宙学场景

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-03-27 DOI: 10.1139/cjp-2022-0203

V. Gore, A. Dixit, D. Chouhan

{"title":"String cosmological scenario in periodic time-varying deceleration parameter in Lyra geometry","authors":"V. Gore, A. Dixit, D. Chouhan","doi":"10.1139/cjp-2022-0203","DOIUrl":"https://doi.org/10.1139/cjp-2022-0203","url":null,"abstract":"In this paper, we have studied the bulk viscous fluid connected with string cosmological model in a higher dimensional (five dimensions) Bianchi type-III space–time in the framework of Lyra’s manifold. To get the deterministic solution of the field equations, we assume two physically appropriate conditions: ( i) θ in the model parameter that is proportional to the eigen value of [Formula: see text] of the shear tensor [Formula: see text] and ( ii) the periodic time-varying deceleration parameter q specified as q = mcos ( kt) − 1, where m, k > 0. In this paper, we have studied the periodic time-varying behaviour of a few quantities, such as the deceleration parameter q, the energy density ρ, the proper pressure p, the string tension density λ, the total pressure [Formula: see text], the energy density for particle ρp, and the displacement vector β( t), and we have discussed the physical significance of these quantities. It has been found that in the early stages of the universe’s evolution, string prevails over particles, whereas the universe is dominated by massive string at late time. It is also noted that the string phase of the cosmos does not vanish in the model since particle density is constantly positive throughout the universe’s history. In normal gauge treatment, β( t) acts like cosmological constant (Λ), and the solutions are compatible with observations. For the stability analysis, we have investigated the nature of various energy conditions (ECs). The positive behaviour of DEC indicates the model’s validation; on the other hand, SEC and WEC are violating, indicating the universe’s accelerated expansion.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"9 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90336393","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

Diffusion Monte Carlo calculations on the low-lying states of LaX (X = Ge, As, Te) LaX (X = Ge, As, Te)低洼态的扩散蒙特卡罗计算

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-03-24 DOI: 10.1139/cjp-2022-0152

Nagat Elkahwagy, A. Ismail

引用次数: 0

EFFECT OF GENERALIZED UNCERTAINTY PRINCIPLE ON ANHARMONIC OSCILLATOR 广义不确定原理对非谐振子的影响

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-03-10 DOI: 10.1139/cjp-2022-0303

Aniket Nag, S. Sahoo

引用次数: 0