Abdur Rasheed, Asif Nazir, Areeb Fatima, Bilal Ramzan, Zubia Kiran, Muhammad Jamil
Abstract This study deals with the instability of shear waves, also known as Kelvin–Helmholtz instability, propagating with a complex frequency ” ω ” in magnetically quantized dense gyro-viscous plasmas. The instability arises from the transverse spatial shear of the streaming velocity, which evolves from the DC electric and magnetic fields. In dense plasmas, quantum effects contribute through magnetically quantized statistical Fermi pressure, tunnelling potential and exchange-correlation potential. The contribution of the shear profile, the drift velocity, the number density of medium species, the dc magnetic field and the propagation angle θ of the wavevector on the instability is pointed out analytically as well as graphically. By varying the angle, shear size and density of plasma particles, the growth rate is enhanced. It does not, however, change as the streaming speed increases. This work seeks applications to study the characteristics of complex media like astrophysical and semiconductor plasmas [R. P. Drake, “Hydrodynamic instabilities in astrophysics and in laboratory high-energy–density systems,” Plasma Phys. Control. Fusion , vol. 47, p. B419, 2005].
摘要本文研究了以复频率“ω”在磁量子化稠密陀螺粘性等离子体中传播的剪切波的不稳定性，也称为开尔文-亥姆霍兹不稳定性。流速度的横向空间剪切引起了不稳定性，而流速度的横向空间剪切是由直流电场和磁场演变而来的。在致密等离子体中，量子效应通过磁量子化的统计费米压力、隧穿势和交换相关势起作用。用解析法和图解法指出了剪切剖面、漂移速度、介质种类数密度、直流磁场和波矢量传播角θ对不稳定性的贡献。通过改变等离子体粒子的角度、剪切尺寸和密度，可以提高等离子体粒子的生长速度。但是，它不会随着流媒体速度的增加而改变。这项工作寻求应用于研究复杂介质的特性，如天体物理和半导体等离子体[R]。P. Drake，“天体物理学和实验室高能量密度系统中的流体动力学不稳定性”，《等离子体物理学》。控制。核聚变，vol. 47, p. 419, 2005]。
{"title":"Kelvin–Helmholtz instability in magnetically quantized dense plasmas","authors":"Abdur Rasheed, Asif Nazir, Areeb Fatima, Bilal Ramzan, Zubia Kiran, Muhammad Jamil","doi":"10.1515/zna-2023-0123","DOIUrl":"https://doi.org/10.1515/zna-2023-0123","url":null,"abstract":"Abstract This study deals with the instability of shear waves, also known as Kelvin–Helmholtz instability, propagating with a complex frequency ” ω ” in magnetically quantized dense gyro-viscous plasmas. The instability arises from the transverse spatial shear of the streaming velocity, which evolves from the DC electric and magnetic fields. In dense plasmas, quantum effects contribute through magnetically quantized statistical Fermi pressure, tunnelling potential and exchange-correlation potential. The contribution of the shear profile, the drift velocity, the number density of medium species, the dc magnetic field and the propagation angle θ of the wavevector on the instability is pointed out analytically as well as graphically. By varying the angle, shear size and density of plasma particles, the growth rate is enhanced. It does not, however, change as the streaming speed increases. This work seeks applications to study the characteristics of complex media like astrophysical and semiconductor plasmas [R. P. Drake, “Hydrodynamic instabilities in astrophysics and in laboratory high-energy–density systems,” Plasma Phys. Control. Fusion , vol. 47, p. B419, 2005].","PeriodicalId":54395,"journal":{"name":"Zeitschrift Fur Naturforschung Section A-A Journal of Physical Sciences","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135823893","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}
Abstract We propose a Nambu Jona-Lasinio (NJL) effective model of relativistic superconductivity. In this framework, we discuss possible electromagnetic (EM) behaviors of (specifically) type-II superconductivity in line with the nonrelativistic Ginzburg–Landau (GL) theory. We comment on possible solitonic solutions of this model. Our investigation could be of relevance to describe type-II proton superconductivity in neutron-star crusts.
{"title":"Nambu Jona-Lasinio model of relativistic superconductivity","authors":"Stanley A. Bruce","doi":"10.1515/zna-2023-0120","DOIUrl":"https://doi.org/10.1515/zna-2023-0120","url":null,"abstract":"Abstract We propose a Nambu Jona-Lasinio (NJL) effective model of relativistic superconductivity. In this framework, we discuss possible electromagnetic (EM) behaviors of (specifically) type-II superconductivity in line with the nonrelativistic Ginzburg–Landau (GL) theory. We comment on possible solitonic solutions of this model. Our investigation could be of relevance to describe type-II proton superconductivity in neutron-star crusts.","PeriodicalId":54395,"journal":{"name":"Zeitschrift Fur Naturforschung Section A-A Journal of Physical Sciences","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135884416","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}
Abstract The work explores the heat transfer capabilities of semiconducting graphitic carbon nitride (g-C 3 N 4 ) nanofluids. Also, it presents a sustainable and eco-friendly method for synthesizing g-C 3 N 4 nanoparticles using commercially available rice flour as a natural carbon precursor through hydrothermal treatment. The synthesized sample subjected to various characterizations, including analysis of their structure, morphology, thermal properties, and optical properties. The optical bandgap (2.66 eV) is deduced through Tauc plot analysis and reveals the semiconducting nature of the sample. The formation of g-C 3 N 4 is confirmed by various spectroscopic techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR), and Raman spectroscopy. Thermogravimetric analysis (TGA) demonstrates the nanoparticles’ excellent thermal stability up to 550 °C, indicating potential applications in heat transfer fluids. The investigation of concentration-dependent thermal diffusivity variation using the sensitive mode mismatched dual beam thermal lens technique highlights the potential of g-C 3 N 4 semiconductor nanofluid as an organic and metal-free additive in industry-demanding coolant applications.
{"title":"Eco-conscious nanofluids: exploring heat transfer performance with graphitic carbon nitride nanoparticles","authors":"Vijayakumar Gokul, Mohanachandran Nair Sindhu Swapna, Sankaranarayana Iyer Sankararaman","doi":"10.1515/zna-2023-0192","DOIUrl":"https://doi.org/10.1515/zna-2023-0192","url":null,"abstract":"Abstract The work explores the heat transfer capabilities of semiconducting graphitic carbon nitride (g-C 3 N 4 ) nanofluids. Also, it presents a sustainable and eco-friendly method for synthesizing g-C 3 N 4 nanoparticles using commercially available rice flour as a natural carbon precursor through hydrothermal treatment. The synthesized sample subjected to various characterizations, including analysis of their structure, morphology, thermal properties, and optical properties. The optical bandgap (2.66 eV) is deduced through Tauc plot analysis and reveals the semiconducting nature of the sample. The formation of g-C 3 N 4 is confirmed by various spectroscopic techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR), and Raman spectroscopy. Thermogravimetric analysis (TGA) demonstrates the nanoparticles’ excellent thermal stability up to 550 °C, indicating potential applications in heat transfer fluids. The investigation of concentration-dependent thermal diffusivity variation using the sensitive mode mismatched dual beam thermal lens technique highlights the potential of g-C 3 N 4 semiconductor nanofluid as an organic and metal-free additive in industry-demanding coolant applications.","PeriodicalId":54395,"journal":{"name":"Zeitschrift Fur Naturforschung Section A-A Journal of Physical Sciences","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135824417","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}
Abstract In this paper, the work is concerned with the study of moving boundary based on non-classical heat equation that includes a time dependent heat flux and convection. The latent heat is represented as a function of the moving interface. Mathematical model accounts for a control function varying with heat flux. We have obtained the explicit solution of the given mathematical model in the presence of convection and a control function. The Legendre wavelet Galerkin approach (LWGA) is used to solve the mathematical problem. In a particular case, our numerical results were compared with previous results and found to be in excellent agreement. Moreover, the current numerical technique is more efficient and accurate in comparison to the previous available method. An extensive analysis of the problem parameters is presented. It is found that the control function offers a significant contribution during the melting or freezing of a PCM. A greater value of the heat flux accelerates the rate of propagation of interface. Convection heat transfer increases the speed of the interface. Results obtained from the current study are expected to improve the fundamental understanding of heat transfer and aid in sublimation and desorption like physical phenomena.
{"title":"Numerical simulation of a non-classical moving boundary problem with control function and generalized latent heat as a function of moving interface","authors":"None Jitendra, Vikas Chaurasiya, Kabindra Nath Rai, Jitendra Singh","doi":"10.1515/zna-2023-0226","DOIUrl":"https://doi.org/10.1515/zna-2023-0226","url":null,"abstract":"Abstract In this paper, the work is concerned with the study of moving boundary based on non-classical heat equation that includes a time dependent heat flux and convection. The latent heat is represented as a function of the moving interface. Mathematical model accounts for a control function varying with heat flux. We have obtained the explicit solution of the given mathematical model in the presence of convection and a control function. The Legendre wavelet Galerkin approach (LWGA) is used to solve the mathematical problem. In a particular case, our numerical results were compared with previous results and found to be in excellent agreement. Moreover, the current numerical technique is more efficient and accurate in comparison to the previous available method. An extensive analysis of the problem parameters is presented. It is found that the control function offers a significant contribution during the melting or freezing of a PCM. A greater value of the heat flux accelerates the rate of propagation of interface. Convection heat transfer increases the speed of the interface. Results obtained from the current study are expected to improve the fundamental understanding of heat transfer and aid in sublimation and desorption like physical phenomena.","PeriodicalId":54395,"journal":{"name":"Zeitschrift Fur Naturforschung Section A-A Journal of Physical Sciences","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135804613","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}
Abstract Momentum is characterized in terms of inertial mass for particles moving at less than the speed of light, but entirely in terms of their energy for those lacking inertia. Does this difference suggest a physically distinct origin of momentum in the two cases and, if so, what is actually being conserved in interactions involving both types of particle? In this paper, we consider a recently proposed gravitational origin for rest-mass energy to demonstrate that a single definition of momentum applies to all particles, massless or otherwise. When introduced into this description, inertial mass is merely a surrogate for the particle’s ‘free’ energy, but does not imply an origin of momentum different from that of particles without mass.
{"title":"Why does momentum depend on inertia?","authors":"Fulvio Melia","doi":"10.1515/zna-2023-0168","DOIUrl":"https://doi.org/10.1515/zna-2023-0168","url":null,"abstract":"Abstract Momentum is characterized in terms of inertial mass for particles moving at less than the speed of light, but entirely in terms of their energy for those lacking inertia. Does this difference suggest a physically distinct origin of momentum in the two cases and, if so, what is actually being conserved in interactions involving both types of particle? In this paper, we consider a recently proposed gravitational origin for rest-mass energy to demonstrate that a single definition of momentum applies to all particles, massless or otherwise. When introduced into this description, inertial mass is merely a surrogate for the particle’s ‘free’ energy, but does not imply an origin of momentum different from that of particles without mass.","PeriodicalId":54395,"journal":{"name":"Zeitschrift Fur Naturforschung Section A-A Journal of Physical Sciences","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135969235","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}
Abstract The impact of dust streaming and polarization force on dust acoustic solitary waves (DASWs) is examined in a non-magnetized dusty plasma made up of negatively charged dust, superthermal ions, and Maxwellian electrons. In the linear limit, the dispersion relation is derived and numerically analyzed. In order to explore the characteristics of arbitrary amplitude DASWs, a Sagdeev potential technique is used. It is explored how the existence domain and characteristics of the DASWs are affected by the polarization force connected to the superthermality index of ions and dust streaming. The relevance of the present study to space dusty plasma, in particular to Saturn’s F-ring, is highlighted.
{"title":"The effect of dust streaming on arbitrary amplitude solitary waves in superthermal polarized space dusty plasma","authors":"Syeda Neelam Naeem, Anisa Qamar, Ata-ur Rahman, Wedad Albalawi","doi":"10.1515/zna-2023-0104","DOIUrl":"https://doi.org/10.1515/zna-2023-0104","url":null,"abstract":"Abstract The impact of dust streaming and polarization force on dust acoustic solitary waves (DASWs) is examined in a non-magnetized dusty plasma made up of negatively charged dust, superthermal ions, and Maxwellian electrons. In the linear limit, the dispersion relation is derived and numerically analyzed. In order to explore the characteristics of arbitrary amplitude DASWs, a Sagdeev potential technique is used. It is explored how the existence domain and characteristics of the DASWs are affected by the polarization force connected to the superthermality index of ions and dust streaming. The relevance of the present study to space dusty plasma, in particular to Saturn’s F-ring, is highlighted.","PeriodicalId":54395,"journal":{"name":"Zeitschrift Fur Naturforschung Section A-A Journal of Physical Sciences","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136012815","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}
Hussein A. Elsayed, Chandra Sekhar Mishra, Abdulkarem H. M. Almawgani, Yahya Ali Abdelrahman Ali, Ahmed Mehaney
Abstract In this study, the transfer matrix method is used to analyze the optical properties of a layered structure, {Air(SrTiO 3 /BSCCO) 20 Substrate}, consisting of air, SrTiO 3 , BSCCO (bismuth strontium calcium copper oxide) bilayers, and a substrate. This paper aims to investigate the transmittance spectra of two proposed one-dimensional (1D) structures, including a conventional superconductor photonic crystal (PC) and a gyroidal superconductor PC at infrared (IR) wavelengths. A comprehensive analysis has been carried out to provide useful insights into the optical properties and the behavior of the proposed structure, highlighting the impact of many parameters, such as refractive index, filling fraction, and layer thickness. The numerical findings showed that the permittivity of the BSCCO superconductor of a gyroidal geometry takes a different response compared to the conventional one. Notably, the filling fraction and refractive index of the host material have a significant control on both real and imaginary parts of the gyroidal BSCCO permittivity through the considered wavelengths. Thus, the proposed design provides high transmittivity outside the obtained photonic band gap compared to the conventional one. We believe that the designed one-dimensional gyroidal BSCCO photonic crystals could act as an efficient reflector through near IR for optoelectronics and energy applications.
{"title":"The transmittance properties of the one-dimensional gyroidal superconductor photonic crystals","authors":"Hussein A. Elsayed, Chandra Sekhar Mishra, Abdulkarem H. M. Almawgani, Yahya Ali Abdelrahman Ali, Ahmed Mehaney","doi":"10.1515/zna-2023-0179","DOIUrl":"https://doi.org/10.1515/zna-2023-0179","url":null,"abstract":"Abstract In this study, the transfer matrix method is used to analyze the optical properties of a layered structure, {Air(SrTiO 3 /BSCCO) 20 Substrate}, consisting of air, SrTiO 3 , BSCCO (bismuth strontium calcium copper oxide) bilayers, and a substrate. This paper aims to investigate the transmittance spectra of two proposed one-dimensional (1D) structures, including a conventional superconductor photonic crystal (PC) and a gyroidal superconductor PC at infrared (IR) wavelengths. A comprehensive analysis has been carried out to provide useful insights into the optical properties and the behavior of the proposed structure, highlighting the impact of many parameters, such as refractive index, filling fraction, and layer thickness. The numerical findings showed that the permittivity of the BSCCO superconductor of a gyroidal geometry takes a different response compared to the conventional one. Notably, the filling fraction and refractive index of the host material have a significant control on both real and imaginary parts of the gyroidal BSCCO permittivity through the considered wavelengths. Thus, the proposed design provides high transmittivity outside the obtained photonic band gap compared to the conventional one. We believe that the designed one-dimensional gyroidal BSCCO photonic crystals could act as an efficient reflector through near IR for optoelectronics and energy applications.","PeriodicalId":54395,"journal":{"name":"Zeitschrift Fur Naturforschung Section A-A Journal of Physical Sciences","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135044400","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}
Muhammad Waqas, Abdul Shakoor, Muhammad Nadeem, Ghazi Aman Nowsherwan, Ahmar Ali, Muhammad Fasih Aamir, Shahbaz Younas Bhatti, Ahmed Bilal, Anis Ur Rehman
Abstract Thermoelectrics is an emerging technology in the field of renewable energy sources, and the exploration of doped materials has opened up new avenues for enhancing their performance. La-doped thermoelectric materials with the composition Bi 2− x La x Te 3 ( x = 0.0, 0.1, 0.2, 0.3, 0.4) were synthesized using the WOWS sol–gel method and sintered at 500 °C for 5 h. X-ray diffraction analysis confirmed a rhombohedral crystal structure with lattice constants of a = b = 4.41(2) Å and c = 29.81(3) Å. Scanning electron microscopy revealed particle-like shapes (0.7–2.5 μm). Fourier transform infrared spectroscopy confirmed the single-phase nature of the samples. DC electrical measurements showed increasing conductivity with temperature. AC electrical analysis demonstrated frequency-dependent behavior with increasing AC conductivity and decreasing loss factor and dielectric constants. Seebeck coefficient measurements exhibited temperature-dependent behavior. Thermal transport properties showed increasing thermal conductivity and volumetric specific heat with temperature, while thermal diffusivity decreased. The composition Bi 1.9 La 0.1 Te 3 with x = 0.1 doping displayed lower thermal conductivity, higher electrical conductivity, and a higher ZT value, making it more suitable for thermoelectric applications. Furthermore, the sample Bi 1.8 La 0.2 Te 3 exhibited favorable characteristics for energy storage applications compared to the other samples. These findings provide insights into the potential applications of La-doped bismuth telluride compounds in thermoelectric and energy storage systems.
摘要:热电技术是可再生能源领域的新兴技术，掺杂材料的探索为提高热电材料的性能开辟了新的途径。采用WOWS溶胶-凝胶法合成了成分为Bi 2−x La x Te 3 (x = 0.0, 0.1, 0.2, 0.3, 0.4)的La掺杂热电材料，并在500℃下烧结5 h。x射线衍射分析证实了其晶格常数为a = b = 4.41(2) Å和C = 29.81(3) Å的菱形晶体结构。扫描电镜显示颗粒状(0.7 ~ 2.5 μm)。傅里叶变换红外光谱证实了样品的单相性质。直流电测量显示电导率随温度升高而增加。交流电学分析表明，随着交流电导率的增加，损耗因子和介电常数的降低，频率依赖性增强。塞贝克系数测量显示出温度依赖行为。热输运性能随温度升高，导热系数和体积比热增大，而热扩散系数减小。掺杂x = 0.1的Bi 1.9 La 0.1 Te 3具有较低的导热系数、较高的导电性和较高的ZT值，更适合热电应用。此外，与其他样品相比，样品Bi 1.8 La 0.2 Te 3表现出良好的储能特性。这些发现为la掺杂碲化铋化合物在热电和储能系统中的潜在应用提供了见解。
{"title":"Unveiling transport properties in rare-earth-substituted nanostructured bismuth telluride for thermoelectric application","authors":"Muhammad Waqas, Abdul Shakoor, Muhammad Nadeem, Ghazi Aman Nowsherwan, Ahmar Ali, Muhammad Fasih Aamir, Shahbaz Younas Bhatti, Ahmed Bilal, Anis Ur Rehman","doi":"10.1515/zna-2023-0162","DOIUrl":"https://doi.org/10.1515/zna-2023-0162","url":null,"abstract":"Abstract Thermoelectrics is an emerging technology in the field of renewable energy sources, and the exploration of doped materials has opened up new avenues for enhancing their performance. La-doped thermoelectric materials with the composition Bi 2− x La x Te 3 ( x = 0.0, 0.1, 0.2, 0.3, 0.4) were synthesized using the WOWS sol–gel method and sintered at 500 °C for 5 h. X-ray diffraction analysis confirmed a rhombohedral crystal structure with lattice constants of a = b = 4.41(2) Å and c = 29.81(3) Å. Scanning electron microscopy revealed particle-like shapes (0.7–2.5 μm). Fourier transform infrared spectroscopy confirmed the single-phase nature of the samples. DC electrical measurements showed increasing conductivity with temperature. AC electrical analysis demonstrated frequency-dependent behavior with increasing AC conductivity and decreasing loss factor and dielectric constants. Seebeck coefficient measurements exhibited temperature-dependent behavior. Thermal transport properties showed increasing thermal conductivity and volumetric specific heat with temperature, while thermal diffusivity decreased. The composition Bi 1.9 La 0.1 Te 3 with x = 0.1 doping displayed lower thermal conductivity, higher electrical conductivity, and a higher ZT value, making it more suitable for thermoelectric applications. Furthermore, the sample Bi 1.8 La 0.2 Te 3 exhibited favorable characteristics for energy storage applications compared to the other samples. These findings provide insights into the potential applications of La-doped bismuth telluride compounds in thermoelectric and energy storage systems.","PeriodicalId":54395,"journal":{"name":"Zeitschrift Fur Naturforschung Section A-A Journal of Physical Sciences","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135094835","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}
Arif Ullah, Jinghao Zhuang, Zheng Liu, Xiaozhan Yang, Wenlin Feng
Abstract In this work, the phosphors of Eu 3+ ions doped Ba 2.9 Sr 0.1 WO 6 were successfully synthesized by the high-temperature solid-state method. The luminescence properties, including the emission and excitation spectra, fluorescent lifetimes, and CIE chromaticity coordinates were characterized. The crystal structure and composite of the samples were investigated by XRD (X-ray diffraction), and HRTEM (high-resolution transmission electron microscope). The emission spectra consist of the characteristic peak of Eu 3+ excitation at 393 nm; the leading emission peak at 618 nm can be ascribed to the transition of 7 F 0 → 5 L 6 . The optimal red emission is achieved by 2 % Eu 3+ doping. This red Ba 2.9 Sr 0.1 WO 6 : Eu 3+ has good luminescent properties and may have potential application in white LEDs.
摘要:本文采用高温固相法成功合成了Eu 3+离子掺杂Ba 2.9 Sr 0.1 wo6的荧光粉。表征了材料的发光特性，包括发射光谱、激发光谱、荧光寿命和CIE色度坐标。采用XRD (x射线衍射)和HRTEM(高分辨率透射电镜)对样品的晶体结构和组成进行了研究。发射光谱由393 nm处的eu3 +激发特征峰组成;618 nm处的先导发射峰可归因于7 f0→5 l6的跃迁。掺2%的eu3 +达到了最佳的红发射效果。该红色ba2.9 Sr 0.1 wo6: eu3 +具有良好的发光性能，在白光led中有潜在的应用前景。
{"title":"Synthesis, structure, and luminescence properties of double perovskites Ba<sub>2.9</sub>Sr<sub>0.1</sub>WO<sub>6</sub>: Eu<sup>3+</sup> red emitting phosphor","authors":"Arif Ullah, Jinghao Zhuang, Zheng Liu, Xiaozhan Yang, Wenlin Feng","doi":"10.1515/zna-2023-0212","DOIUrl":"https://doi.org/10.1515/zna-2023-0212","url":null,"abstract":"Abstract In this work, the phosphors of Eu 3+ ions doped Ba 2.9 Sr 0.1 WO 6 were successfully synthesized by the high-temperature solid-state method. The luminescence properties, including the emission and excitation spectra, fluorescent lifetimes, and CIE chromaticity coordinates were characterized. The crystal structure and composite of the samples were investigated by XRD (X-ray diffraction), and HRTEM (high-resolution transmission electron microscope). The emission spectra consist of the characteristic peak of Eu 3+ excitation at 393 nm; the leading emission peak at 618 nm can be ascribed to the transition of 7 F 0 → 5 L 6 . The optimal red emission is achieved by 2 % Eu 3+ doping. This red Ba 2.9 Sr 0.1 WO 6 : Eu 3+ has good luminescent properties and may have potential application in white LEDs.","PeriodicalId":54395,"journal":{"name":"Zeitschrift Fur Naturforschung Section A-A Journal of Physical Sciences","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135132378","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}
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