Pub Date : 2019-01-01DOI: 10.1080/23311940.2019.1660495
Xiang Zhang, S. Thapa, N. Dutta
Abstract Recent progress of high-speed all-optical logic gates based on dual semiconductor optical amplifiers (SOAs) has been reviewed in this article. These schemes include using quantum-dot semiconductor optical amplifier (QD-SOA) and two-photon absorption (TPA). Numerical simulation method was presented by solving the rate equations of gain dynamics in the SOA. Performance of all-optical logic operation is discussed by calculating the quality factor and plotting the eye diagram. Results show that the dual SOA scheme is a promising method for the realization of high-speed all-optical logic systems in the future.
{"title":"All-optical XOR gates based on dual semiconductor optical amplifiers","authors":"Xiang Zhang, S. Thapa, N. Dutta","doi":"10.1080/23311940.2019.1660495","DOIUrl":"https://doi.org/10.1080/23311940.2019.1660495","url":null,"abstract":"Abstract Recent progress of high-speed all-optical logic gates based on dual semiconductor optical amplifiers (SOAs) has been reviewed in this article. These schemes include using quantum-dot semiconductor optical amplifier (QD-SOA) and two-photon absorption (TPA). Numerical simulation method was presented by solving the rate equations of gain dynamics in the SOA. Performance of all-optical logic operation is discussed by calculating the quality factor and plotting the eye diagram. Results show that the dual SOA scheme is a promising method for the realization of high-speed all-optical logic systems in the future.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2019.1660495","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43295084","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 : 2019-01-01DOI: 10.1080/23311940.2019.1707624
Wenbo Li
Abstract Mode locked pulse generation has been reported using both active and passive mode locking schemes. Active mode locking technique has been proven to be an effective way to generate high-repetition-rate pulses by incorporating a modulator inside the laser cavity. Compared to actively mode locked lasers, passively mode locked lasers can generate pulse train at ultrashort pulse width but with relatively lower repetition rate. Thus, it is a brilliant idea to build a hybrid mode locked system combining both active and passive mode lockers. In this review, several hybrid mode locked fiber ring laser systems are discussed and summarized. Hybrid mode locking is a promising method to generate high-speed ultrashort optical pulses for fiber-optic telecommunication system.
{"title":"Different methods to achieve hybrid mode locking","authors":"Wenbo Li","doi":"10.1080/23311940.2019.1707624","DOIUrl":"https://doi.org/10.1080/23311940.2019.1707624","url":null,"abstract":"Abstract Mode locked pulse generation has been reported using both active and passive mode locking schemes. Active mode locking technique has been proven to be an effective way to generate high-repetition-rate pulses by incorporating a modulator inside the laser cavity. Compared to actively mode locked lasers, passively mode locked lasers can generate pulse train at ultrashort pulse width but with relatively lower repetition rate. Thus, it is a brilliant idea to build a hybrid mode locked system combining both active and passive mode lockers. In this review, several hybrid mode locked fiber ring laser systems are discussed and summarized. Hybrid mode locking is a promising method to generate high-speed ultrashort optical pulses for fiber-optic telecommunication system.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2019.1707624","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45741261","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 : 2018-01-01DOI: 10.1080/23311940.2018.1498146
T. Abodunrin, A. Boyo, M. Usikalu
Abstract Titanium oxide is as ancient in age as our planet but its use for photoanode is more recent. It exists naturally as rutile (the second most abundant), anatase and brookite ores. The anatase several metastable states trigger diverse spectral responses with Magnifera Indica Linn. (M.indica L) dye as it is synthesized with an N719 dye grown on its matrix. Facile doctor blade method and high temperature sintering at 723 K were used in fabrication. Doping of titanium oxide in effect lowers the band gap of TiO2 for photo-excitation caused by a bathochromic shift and simultaneously decreases the rate of recombination in photogenerated electron–hole pairs. This study explored the visible light induced photocatalytic action of doped M.indica L DSSC towards reduction of titanium oxide bandgap. The SEM micrographs reveal the molecular interactions and the interplay as electrolytes percolate the intricate N719 dye/Titania framework. Detailed analysis stem from comparison of M.indica L crude faction and the batch separated faction using FTIR spectroscopy. The absorbance peak, rates of reaction and % transmittance identify the particular chromophores responsible for the reaction. Result shows the batch-separated hexane faction approximately 1000 times more efficient than its crude faction although the ff of the crude was only about twice that of the hexane faction. The optical study showed that doping ions lead to an increase in the absorption edge wavelength, and a decrease in the band gap energy of TiO2 nanoparticles. The doped TiO2 nanoparticles in general showed higher photocatalytic activities than the pure ones.
摘要氧化钛与我们的地球一样古老，但其用于光阳极是最近的事情。它以金红石(储量第二丰富)、锐钛矿和brookite矿的形式自然存在。锐钛矿的几个亚稳态触发了不同的光谱响应。它是用生长在其基质上的N719染料合成的。采用易刀法和723 K高温烧结制备。氧化钛的掺杂有效地降低了TiO2的光激发带隙，同时降低了光生电子-空穴对的复合速率。本研究探讨了在可见光诱导下，掺杂m.i indica L DSSC对氧化钛带隙减小的光催化作用。SEM显微图揭示了电解质渗透到复杂的N719染料/二氧化钛框架中的分子相互作用和相互作用。通过FTIR光谱对粗馏分和间歇分离馏分进行了比较。吸收峰，反应速率和%透射率确定负责反应的特定发色团。结果表明，间歇分离的正己烷馏分的效率是粗馏分的1000倍左右，而粗馏分的效率仅为正己烷馏分的2倍左右。光学研究表明，掺杂离子导致TiO2纳米粒子的吸收边波长增加，带隙能降低。总的来说，掺杂的TiO2纳米粒子比纯掺杂的TiO2纳米粒子具有更高的光催化活性。
{"title":"The interboundary properties and kinematics of N719 dye with titania photoanode framework and spectral responses with different electrolytes","authors":"T. Abodunrin, A. Boyo, M. Usikalu","doi":"10.1080/23311940.2018.1498146","DOIUrl":"https://doi.org/10.1080/23311940.2018.1498146","url":null,"abstract":"Abstract Titanium oxide is as ancient in age as our planet but its use for photoanode is more recent. It exists naturally as rutile (the second most abundant), anatase and brookite ores. The anatase several metastable states trigger diverse spectral responses with Magnifera Indica Linn. (M.indica L) dye as it is synthesized with an N719 dye grown on its matrix. Facile doctor blade method and high temperature sintering at 723 K were used in fabrication. Doping of titanium oxide in effect lowers the band gap of TiO2 for photo-excitation caused by a bathochromic shift and simultaneously decreases the rate of recombination in photogenerated electron–hole pairs. This study explored the visible light induced photocatalytic action of doped M.indica L DSSC towards reduction of titanium oxide bandgap. The SEM micrographs reveal the molecular interactions and the interplay as electrolytes percolate the intricate N719 dye/Titania framework. Detailed analysis stem from comparison of M.indica L crude faction and the batch separated faction using FTIR spectroscopy. The absorbance peak, rates of reaction and % transmittance identify the particular chromophores responsible for the reaction. Result shows the batch-separated hexane faction approximately 1000 times more efficient than its crude faction although the ff of the crude was only about twice that of the hexane faction. The optical study showed that doping ions lead to an increase in the absorption edge wavelength, and a decrease in the band gap energy of TiO2 nanoparticles. The doped TiO2 nanoparticles in general showed higher photocatalytic activities than the pure ones.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2018.1498146","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60085518","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 : 2018-01-01DOI: 10.1080/23311940.2018.1464368
R. Maulik, O. San
Abstract We put forth a dynamic closure modeling framework for the large eddy simulations of the Burgers equation based upon the use of the approximate deconvolution (AD) procedure to compute the Smagorinsky constant self-adaptively from the resolved flow quantities. In our proposed framework, the test filtering process of the standard dynamic model is replaced by the AD procedure. The robustness of the model has been tested considering the Burgers equation in its conservative and skew-symmetric forms. Our numerical assessments for solving the single-mode sine wave and the decaying Burgers turbulence problems show that the present framework effectively damps grid-to-grid oscillations and yields an improved shock capturing property for central numerical schemes as underlying discretizations.
{"title":"A dynamic closure modeling framework for large eddy simulation using approximate deconvolution: Burgers equation","authors":"R. Maulik, O. San","doi":"10.1080/23311940.2018.1464368","DOIUrl":"https://doi.org/10.1080/23311940.2018.1464368","url":null,"abstract":"Abstract We put forth a dynamic closure modeling framework for the large eddy simulations of the Burgers equation based upon the use of the approximate deconvolution (AD) procedure to compute the Smagorinsky constant self-adaptively from the resolved flow quantities. In our proposed framework, the test filtering process of the standard dynamic model is replaced by the AD procedure. The robustness of the model has been tested considering the Burgers equation in its conservative and skew-symmetric forms. Our numerical assessments for solving the single-mode sine wave and the decaying Burgers turbulence problems show that the present framework effectively damps grid-to-grid oscillations and yields an improved shock capturing property for central numerical schemes as underlying discretizations.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2018.1464368","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46173259","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 : 2018-01-01DOI: 10.1080/23311940.2018.1496613
K. Ogawa, T. Ichitsubo, S. Ishioka
Abstract Thermodynamics for ideal plastic deformation causing no disorganization of the structure in the deformed body, which was discussed by P. W. Bridgman studied (1950), revealed that the concept of entropy was still applicable to its irreversible process. Noting that the structural invariability in an ideal plastic body is physically equivalent to the prerequisite of thermodynamics, namely, thermodynamic quantities must be independent of the macroscopic body shape, the generalized concept of entropy can be extended to the other thermodynamic potentials such as internal energy, free energies and so on. Here the extended generalization for ideal plastic deformation is theoretically justified on the basis of the irreversible thermodynamics constructed by Prigogine and his discipline. Thermodynamic state of the ideally deformed body is found to be specified both by the generalized thermodynamic potential (S, U, F, H or G) and by the irreversible potential energy J which drives the plastic deformation.
P. W. Bridgman(1950)研究了变形体中不破坏结构的理想塑性变形热力学，揭示了熵的概念仍然适用于其不可逆过程。注意到理想塑性体的结构不变性在物理上等同于热力学的先决条件，即热力学量必须与宏观形体无关，因此广义熵的概念可以推广到其他热力学势，如内能、自由能等。在普里高津及其学科所建立的不可逆热力学的基础上，对理想塑性变形的推广在理论上是合理的。发现理想变形体的热力学状态可以由广义热力学势(S, U, F, H或G)和驱动塑性变形的不可逆势能J来指定。
{"title":"Irreversible thermodynamics of ideal plastic deformation","authors":"K. Ogawa, T. Ichitsubo, S. Ishioka","doi":"10.1080/23311940.2018.1496613","DOIUrl":"https://doi.org/10.1080/23311940.2018.1496613","url":null,"abstract":"Abstract Thermodynamics for ideal plastic deformation causing no disorganization of the structure in the deformed body, which was discussed by P. W. Bridgman studied (1950), revealed that the concept of entropy was still applicable to its irreversible process. Noting that the structural invariability in an ideal plastic body is physically equivalent to the prerequisite of thermodynamics, namely, thermodynamic quantities must be independent of the macroscopic body shape, the generalized concept of entropy can be extended to the other thermodynamic potentials such as internal energy, free energies and so on. Here the extended generalization for ideal plastic deformation is theoretically justified on the basis of the irreversible thermodynamics constructed by Prigogine and his discipline. Thermodynamic state of the ideally deformed body is found to be specified both by the generalized thermodynamic potential (S, U, F, H or G) and by the irreversible potential energy J which drives the plastic deformation.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2018.1496613","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48128522","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 : 2018-01-01DOI: 10.1080/23311940.2018.1480134
F. Caridi, G. Belmusto
Abstract In this article, authors report experimental results obtained, with different diagnostics setups, for radon activity concentration measurement in underground water for human use. An overview is given about the performance of different measurement techniques, based on experimental data. The following parameters are compared and discussed: counting efficiency, minimum detectable activity, measurement uncertainty, background, sample volume and treatment. The estimated average value for radon-specific activity in underground water was compared with that one derived from different legislations and directives/guidelines and it was used, with the dose conversion factor for 222Rn, to estimate the annual effective dose, for adult members of public of the investigated region, due to the groundwater radon ingestion.
{"title":"Radon radioactivity measurements in underground water: A comparison between different diagnostics techniques","authors":"F. Caridi, G. Belmusto","doi":"10.1080/23311940.2018.1480134","DOIUrl":"https://doi.org/10.1080/23311940.2018.1480134","url":null,"abstract":"Abstract In this article, authors report experimental results obtained, with different diagnostics setups, for radon activity concentration measurement in underground water for human use. An overview is given about the performance of different measurement techniques, based on experimental data. The following parameters are compared and discussed: counting efficiency, minimum detectable activity, measurement uncertainty, background, sample volume and treatment. The estimated average value for radon-specific activity in underground water was compared with that one derived from different legislations and directives/guidelines and it was used, with the dose conversion factor for 222Rn, to estimate the annual effective dose, for adult members of public of the investigated region, due to the groundwater radon ingestion.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2018.1480134","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41564940","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 : 2018-01-01DOI: 10.1080/23311940.2017.1422957
M. N. Islam, M. Akbar
Abstract The space-time fractional-coupled Burgers equations and the space-time fractional foam drainage equation are important as an electro-hydro-dynamical model to progress the local electric field and ion acoustic waves in plasma, the shallow water wave problems, and also fluid flow of liquid through foam arisen by gravity and capillarity. In this article, we determine new and further general exact wave solutions to the above-mentioned space-time fractional equations using the generalized (G′/G)-expansion method with the assistance of the fractional complex transformation. It is shown that the method is further effective, convenient, and can be used to establish new solutions for other kind non-linear fractional differential equations arising in mathematical physics. Finally, we depict the 3D and 2D figures of the obtained wave solutions in order to interpret them in geometrical sense.
{"title":"New exact wave solutions to the space-time fractional-coupled Burgers equations and the space-time fractional foam drainage equation","authors":"M. N. Islam, M. Akbar","doi":"10.1080/23311940.2017.1422957","DOIUrl":"https://doi.org/10.1080/23311940.2017.1422957","url":null,"abstract":"Abstract The space-time fractional-coupled Burgers equations and the space-time fractional foam drainage equation are important as an electro-hydro-dynamical model to progress the local electric field and ion acoustic waves in plasma, the shallow water wave problems, and also fluid flow of liquid through foam arisen by gravity and capillarity. In this article, we determine new and further general exact wave solutions to the above-mentioned space-time fractional equations using the generalized (G′/G)-expansion method with the assistance of the fractional complex transformation. It is shown that the method is further effective, convenient, and can be used to establish new solutions for other kind non-linear fractional differential equations arising in mathematical physics. Finally, we depict the 3D and 2D figures of the obtained wave solutions in order to interpret them in geometrical sense.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2017.1422957","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48986274","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 : 2017-01-01DOI: 10.1080/23311940.2017.1388156
Hongyu Hu, Xiang Zhang, Shuai Zhao
The scheme to realize high-speed (~250 Gb/s) all-optical Boolean logic gates using semiconductor optical amplifiers with quantum-dot (QD-SOA) is introduced and analyzed in this review. Numerical si...
{"title":"High Speed All-Optical Logic Gate Using QD-SOA and its Application","authors":"Hongyu Hu, Xiang Zhang, Shuai Zhao","doi":"10.1080/23311940.2017.1388156","DOIUrl":"https://doi.org/10.1080/23311940.2017.1388156","url":null,"abstract":"The scheme to realize high-speed (~250 Gb/s) all-optical Boolean logic gates using semiconductor optical amplifiers with quantum-dot (QD-SOA) is introduced and analyzed in this review. Numerical si...","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2017.1388156","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60084864","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 : 2017-01-01DOI: 10.1080/23311940.2017.1299559
Md. Hafijur Rahman, A. Ismail
Abstract Effect of LaCl3 concentration on the electrical conduction mechanism of LaF3/porous silicon (PS) structure has been investigated in this work. LaF3 layers have been deposited by a novel chemical bath deposition (CBD) technique. With this simple technique, LaF3 produced as LaCl3 are made to react with hydrofluoric (HF) acid on the porous silicon substrate. This enables direct deposition of LaF3 on the pore walls of the porous silicon leading to a successful passivation of PS. The compositions of the deposited LaF3 were confirmed by Energy Dispersive of X-ray (EDX) analysis. The electrical conduction study has been done by impedance analyzer (HP4294A). From this study it can be concluded that the conductance increases with LaCl3 concentration but decreases for higher concentration.
{"title":"Investigation on the influence of LaCl3 concentration on the electrical conduction mechanism of chemical-bath deposited LaF3/porous-silicon structure","authors":"Md. Hafijur Rahman, A. Ismail","doi":"10.1080/23311940.2017.1299559","DOIUrl":"https://doi.org/10.1080/23311940.2017.1299559","url":null,"abstract":"Abstract Effect of LaCl3 concentration on the electrical conduction mechanism of LaF3/porous silicon (PS) structure has been investigated in this work. LaF3 layers have been deposited by a novel chemical bath deposition (CBD) technique. With this simple technique, LaF3 produced as LaCl3 are made to react with hydrofluoric (HF) acid on the porous silicon substrate. This enables direct deposition of LaF3 on the pore walls of the porous silicon leading to a successful passivation of PS. The compositions of the deposited LaF3 were confirmed by Energy Dispersive of X-ray (EDX) analysis. The electrical conduction study has been done by impedance analyzer (HP4294A). From this study it can be concluded that the conductance increases with LaCl3 concentration but decreases for higher concentration.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2017.1299559","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43152451","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 : 2017-01-01DOI: 10.1080/23311940.2017.1380454
H. Maiz Hadj Ahmed, A. Zaoui, M. Ferhat
Abstract We apply density-functional theory (DFT) using full potential linearized augmented plane wave (FP-LAPW) method to revisiting the electronic structure properties of super-heavy element 114, namely Flerovium (Fl). For the structural properties, among the four phases investigated here (fcc, bcc, hcp, and sc), we found that the face-centered-cubic phase is the ground state of Fl, discarding the hexago- nal-close-packed ground state phase found previously. Interestingly, it is found that the bcc phase competes strongly with the fcc phase for the ground stability, since the total energy difference between the fcc and bcc structures are extremely small (~1 meV). The other structures (i.e. hcp and sc) remain energetically higher, and thus do not compete for the phase stability of this element. The lattice dynamics calculations provide strong support for the calculated static ground state phase of super-heavy element 114, capturing the dynamical stability of the face-centered cubic phase and the dynamical instability of the body-centered cubic phase.
{"title":"Revisiting the ground state phase stability of super-heavy element Flerovium","authors":"H. Maiz Hadj Ahmed, A. Zaoui, M. Ferhat","doi":"10.1080/23311940.2017.1380454","DOIUrl":"https://doi.org/10.1080/23311940.2017.1380454","url":null,"abstract":"Abstract We apply density-functional theory (DFT) using full potential linearized augmented plane wave (FP-LAPW) method to revisiting the electronic structure properties of super-heavy element 114, namely Flerovium (Fl). For the structural properties, among the four phases investigated here (fcc, bcc, hcp, and sc), we found that the face-centered-cubic phase is the ground state of Fl, discarding the hexago- nal-close-packed ground state phase found previously. Interestingly, it is found that the bcc phase competes strongly with the fcc phase for the ground stability, since the total energy difference between the fcc and bcc structures are extremely small (~1 meV). The other structures (i.e. hcp and sc) remain energetically higher, and thus do not compete for the phase stability of this element. The lattice dynamics calculations provide strong support for the calculated static ground state phase of super-heavy element 114, capturing the dynamical stability of the face-centered cubic phase and the dynamical instability of the body-centered cubic phase.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2017.1380454","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43283323","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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