Revista Mexicana De Fisica最新文献_第3页

Stability improvement of CH3NH3PbI3 hybrid perovskite through tin and chlorine doping 锡和氯掺杂提高CH3NH3PbI3杂化钙钛矿的稳定性

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-09-01 DOI: 10.31349/revmexfis.69.051602

Bertha Oliva Aguilar Reyes, T. E. Soto, K. Sánchez, O. Navarro, A. Valdespino, D. Y. Torres Martínez

引用次数: 0

Structural, electronic, and magnetic properties of ZnTe doped with transition metal Mn 过渡金属Mn掺杂ZnTe的结构、电子和磁性能

4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-09-01 DOI: 10.31349/revmexfis.69.051004

Brach Brach, L. Bahmad, S. Benyoussef

引用次数: 0

Repulsive bound-electron pairs in a Peierls lattice Peierls晶格中的排斥束缚电子对

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-09-01 DOI: 10.31349/revmexfis.69.051601

Uriel Alberto Díaz-Reynoso, Ernesto Huipe-Domratcheva, Oracio Navarro

引用次数: 0

Hubbard's parameter influence on Ba2GdReO6 properties, a promising ferromagnetic double Pérovskite oxide for thermoelectric applications Hubbard的参数对Ba2GdReO6性质的影响，这是一种有前途的热电应用的铁磁双psamroskite氧化物

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-09-01 DOI: 10.31349/revmexfis.69.051006

Y. Bouchentouf Idriss, B. Bouadjemi, M. Matougui, Mohammed Sid Ahmed Houari, T. Lantri, S. Haid, S. Bentata

{"title":"Hubbard's parameter influence on Ba2GdReO6 properties, a promising ferromagnetic double Pérovskite oxide for thermoelectric applications","authors":"Y. Bouchentouf Idriss, B. Bouadjemi, M. Matougui, Mohammed Sid Ahmed Houari, T. Lantri, S. Haid, S. Bentata","doi":"10.31349/revmexfis.69.051006","DOIUrl":"https://doi.org/10.31349/revmexfis.69.051006","url":null,"abstract":"In this paper, an exhaustive investigation was carried out on the compound double Perovskite Ba2GdReO6 including its structural, electronic, magnetic and thermoelectric properties. This study is based on the density functional theory (DFT) and more explicitly on the full potential linearized augmented plane wave (FP-LAPW), in the context of different approximations as exchange and correlation potential such as: The generalized gradient approximation (GGA) and its corollary the Becke – Johnson approach modified by Trans-Blaha (TB - mBJ) for a better approximation of the gap, and the GGA + U approach (where U is the Hubbard correction term). After an analysis of the results obtained, it turns out that the double perovskite material Ba2GdReO6 is a ferromagnetic material and has a half-metallic character, moreover, this compound has an integral magnetic moment of 9µB, which is in accordance with the rule of Slater-Pauling. From the study of the thermoelectric properties consisting in plotting curves of different parameters such as: the Seebeck coefficient (S), electrical conductivity per relaxation time (σ/τ), the electronic thermal conductivity per relaxation time ( /τ) and the merit factor (ZT) as a function of temperature, based on the GGA+U approximation, which is most suitable for the study of this compound, it emerges that the double pérovskite Ba2GdReO6 presents thermoelectric performances in medium to high temperature ranges, in view of the high values of the Seebeck coefficient and those of the electrical conductivity as well as a value close to unity for the merit factor, therefore, this compound can be used for thermoelectric applications in this range of temperatures (medium to high).","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43291190","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

The linear and the angular momentum stored in a distribution of charges in a magnetic field 磁场中电荷分布中的线动量和角动量

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-09-01 DOI: 10.31349/revmexfis.69.050701

G. F. Torres del Castillo

引用次数: 1

Elaboration and characterization of pure ZnO, Ag:ZnO and Ag-Fe:ZnO thin films: Effect of Ag and Ag-Fe doping on ZnO physical properties 纯ZnO、Ag:ZnO和Ag-Fe:ZnO薄膜的制备与表征：Ag和Ag-Fe掺杂对ZnO物理性能的影响

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-09-01 DOI: 10.31349/revmexfis.69.051005

F. Lekoui, Salim Hassani, E. Garoudja, Rachid El Amrani, W. Filali, Ouahid Sifi, S. Oussalah

{"title":"Elaboration and characterization of pure ZnO, Ag:ZnO and Ag-Fe:ZnO thin films: Effect of Ag and Ag-Fe doping on ZnO physical properties","authors":"F. Lekoui, Salim Hassani, E. Garoudja, Rachid El Amrani, W. Filali, Ouahid Sifi, S. Oussalah","doi":"10.31349/revmexfis.69.051005","DOIUrl":"https://doi.org/10.31349/revmexfis.69.051005","url":null,"abstract":"Pure ZnO, Ag doped ZnO and Ag-Fe co-doped ZnOwere preparedusing thermal evaporation. XRD analysis confirms that all layers present a hexagonal wurtzite structure; however, there is a small shift in the peaks position due to thedistortion of the film’s lattice. Scanning Electron Microscopy (SEM) analysis reveals the morphological variation of the film’s surfaces due to the doping. Pure ZnO and Ag:ZnO films have a nanostructured surface, however, Ag-Fe:ZnO films showed a smooth surface without any nanoparticles. Raman analysis showed the presence of A1(LO), E2(high) andlocal vibrational modes (LVMs) for all layers. Ultraviolet–visible spectroscopy (UV-VIS) analysis shows that the films have a good transparency and the bandgapdecreases with ZnO doping from 3.80 eVto 3.78 eV and 3.70 eV,for pure ZnO, Ag:ZnO and Ag-Fe:ZnO films, respectively. The electrical properties confirm the semiconductor nature of ZnO films with a resistivity around 1.4 Ω.cm, and with Ag and Ag-Fe doping, the films behave like conductors with 1.4´10-4Ω.cm and 1.4´10-3Ω.cm, respectively. These results make the Ag:ZnO and Ag-Fe ZnO thin films good materials for photovoltaic application.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48502463","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

Structural, mechanical, electronic, thermal, and optical properties of the inverse-Heusler compounds X2RuPb(X = La, Sc): A first-principles investigation 逆heusler化合物X2RuPb(X = La, Sc)的结构、机械、电子、热学和光学性质:第一性原理研究

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-09-01 DOI: 10.31349/revmexfis.69.050501

Abdelkader Bouazza, M. Khirat, M. Larbi, N. Bettahar, D. Rached

{"title":"Structural, mechanical, electronic, thermal, and optical properties of the inverse-Heusler compounds X2RuPb(X = La, Sc): A first-principles investigation","authors":"Abdelkader Bouazza, M. Khirat, M. Larbi, N. Bettahar, D. Rached","doi":"10.31349/revmexfis.69.050501","DOIUrl":"https://doi.org/10.31349/revmexfis.69.050501","url":null,"abstract":"Topological insulators are novel quantum material states with insulating bulk band gaps and topologically protected metallic surface states that have been extensively studied owing to their intriguing properties for spintronic and quantum-computing applications. The structural, mechanical, electronic, thermal, and optical properties of inverse Heusler compounds La2RuPb and, Sc2 RuPb in two Hg2CuTi, Cu2 MnAltype structures were calculated using the full potential linear muffin-tin orbital simulation methodology as implemented in the computer code,which is based on density functional theory.We employed the local-density approximation for the exchange and correlation potential (XC) terms. Consequently, the optical characteristics of La2 RuPb, Sc2 RuPb and elastic constants Cij and their corresponding elastic moduli were computed for the first time. According to our structural calculations, La2 RuPb is more stable in its Hg2 CuTi-type structure than Sc2 RuPb in its Cu2 MnAl-type structure. However, the mechanical characteristics demonstrate their stability in the final stages of elastic deformation.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44448951","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

Circadian cycles: A time-series approach 昼夜节律周期：一种时间序列方法

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-09-01 DOI: 10.31349/revmexfis.69.051101

Lorena García-Iglesias, A. L. Rivera, R. Fossion

{"title":"Circadian cycles: A time-series approach","authors":"Lorena García-Iglesias, A. L. Rivera, R. Fossion","doi":"10.31349/revmexfis.69.051101","DOIUrl":"https://doi.org/10.31349/revmexfis.69.051101","url":null,"abstract":"\u0000 \u0000 \u0000The extraction of circadian cycles from experimental data can be interpreted as a specific case of time-series or signal analysis, but chrono- biology and time-series analysis appear to have developed according to separate paths. Whereas some techniques such as continuous (CWT) and discrete wavelet analysis (DWT) are used frequently in rhythmobiology, other specialized methdos such as digital filters, nonlinear mode decomposition (NMD), singular spectrum analysis (SSA), empirical mode decomposition (EMD), ensemble empirical mode decomposition (EEMD) and complete ensemble empirical model decomposition with adaptive noise (CEEMDAN) have only occasionally been applied. No studies are available that compare the applicability between a wide variety of different methods or for different variables, and this is the purpose of the present contribution. These methods improve the goodness-of-fit of the circadian cycle with respect to the standard approach of cosinor analysis. They have the additional advantage of being able to quantify the day-to-day variability of the circadian parameters of mesor, amplitude, period and acrophase around their average values, with potential clinical applications to distinguish between healthy and unhealthy populations. Finally, the circadian parameters are interpreted within the context of homeostatic regulation with distinctive statistics for regulated and effector variables. \u0000 \u0000 \u0000","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47976799","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

Solid state transformations from spheres to polyhedrons in hollow Fe spheres 空心铁球中从球体到多面体的固态转换

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-09-01 DOI: 10.31349/revmexfis.69.051001

Centli Tzentzangari Guerrero Caro, I. A. Figueroa, J. A. Verduzco, L. Pérez, L. Bejar, O. Hernández, I. Alfonso

{"title":"Solid state transformations from spheres to polyhedrons in hollow Fe spheres","authors":"Centli Tzentzangari Guerrero Caro, I. A. Figueroa, J. A. Verduzco, L. Pérez, L. Bejar, O. Hernández, I. Alfonso","doi":"10.31349/revmexfis.69.051001","DOIUrl":"https://doi.org/10.31349/revmexfis.69.051001","url":null,"abstract":"The present work analyzes the sintering conditions for ∼ 3 mm inner diameter hollow iron spheres, sintered for manufacturing composite structures. Optimal sintering variables were investigated modifying temperature from 700 to 1200◦C, while times were between 1 and 3 h. Results showed that packing of the spheres increased with time and temperature: at 700◦C sintering was not enough; at temperatures from 800◦ to 1000◦C spheres were well sintered with porosity between them; while at higher temperatures were completely packed. Densities ranged from 0.6 gcm−3 to a maximum of 1.1 gcm−3 for spheres 100% packed, where it was observed a sphere-to-polyhedron shape transformation, with maximum values of penetration (0.39 mm) and sintering neck width (1.42 mm). Complete packing of the Fe particles of the sphere walls was also observed. The use of Design of Experiments made possible to establish correlations between sintering variables and characteristics such as neck width, penetration, porosity and packing. These results could be used as a starting point for the adequate selection of the sintering conditions of hollow Fe spheres for manufacturing hollow composite structures, taking into account not only the characteristics of the sintered hollow spheres but also of the Fe particles forming their walls.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49388149","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

Generalized equations and their solutions in the (1/2,0)+(0,1/2) representations of the Lorentz group 洛伦兹群(1/2,0)+(0,1/2)表示下的广义方程及其解

IF 1.7 4区物理与天体物理

Revista Mexicana De Fisica Pub Date : 2023-09-01 DOI: 10.31349/revmexfis.69.050703

J. A. Cázares, Valeriy Dvoeglazov

{"title":"Generalized equations and their solutions in the (1/2,0)+(0,1/2) representations of the Lorentz group","authors":"J. A. Cázares, Valeriy Dvoeglazov","doi":"10.31349/revmexfis.69.050703","DOIUrl":"https://doi.org/10.31349/revmexfis.69.050703","url":null,"abstract":"We present explicit examples of generalizations in relativistic quantum mechanics. First of all, we discuss the generalized spin-1/2 equations for neutrinos. They have been obtained by means of the Gersten-Sakurai method for derivations of arbitrary-spin relativistic equations. Possible physical consequences are discussed. Next, it is easy to check that both Dirac algebraic equations Det(ˆp − m) = 0 and Det(ˆp + m) = 0 for u− and v− 4-spinors have solutions with p0 = ±Ep = ± p p2 + m2. The same is true for higher-spin equations. Meanwhile, every book considers the equality p0 = Ep for both u− and v− spinors of the (1/2, 0) ⊕ (0, 1/2) representation, thus applying the DiracFeynman-Stueckelberg procedure for elimination of the negative-energy solutions. The recent Ziino works (and, independently, the articles of several others) show that the Fock space can be doubled. We re-consider this possibility on the quantum field level for both S = 1/2 and higher spin particles. The third example is: we postulate the non-commutativity of 4-momenta, and we derive the mass splitting in the Dirac equation. The applications are discussed.","PeriodicalId":21538,"journal":{"name":"Revista Mexicana De Fisica","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69297335","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