{"title":"Comparative study on α-decay of ground and isomeric states of Bi isotopes using improved semi-empirical relationship & modified GLDM","authors":"Tinu Ann Jose, K. P. Santhosh","doi":"10.1007/s12648-025-03573-5","DOIUrl":"10.1007/s12648-025-03573-5","url":null,"abstract":"<div><p>We have improved the SemFIS formula by Poenaru et al. (Phys Rev C 74: 014312, 2006), including the effect of angular momentum and a systematic study on alpha decay half-life of ground and isomeric states of <sup>184−224</sup>Bi (<i>Z</i> = 83) is investigated. We further refined the modified SemFIS by Akrawy et al. (Nucl Phys A 1021: 122419, 2022) eliminates its drawbacks in reproducing experimental data on bismuth isotopes, and the improved SemFIS models show higher accuracy in predicting alpha decay half-life. Also, alpha decay half-life is predicted using the Modified Generalized Liquid Drop Model (MGLDM), its improved version with new preformation parameters and other empirical formulas. Among all models, the New Geiger-Nuttall law demonstrates the lowest standard deviation. We hope our predictions will contribute to further experimental inquiries in this domain.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 9","pages":"3445 - 3461"},"PeriodicalIF":1.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165490","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}
A. S. Mohamed, B. Gul, M. S. Khan, S. M. Aziz, H. Ahmad, F. Abbas
{"title":"Exploring the impact of chalcogen substitution in novel ternary chalcogenides: insight from first-principles investigation","authors":"A. S. Mohamed, B. Gul, M. S. Khan, S. M. Aziz, H. Ahmad, F. Abbas","doi":"10.1007/s12648-025-03572-6","DOIUrl":"10.1007/s12648-025-03572-6","url":null,"abstract":"<div><p>Rare-earth ternary materials have distinctive features such as excellent optical response and exceptional stability in their thermoelectric nature. The present study investigates the complex interaction between the structural, optoelectronic, and thermoelectric properties of the novel NdXF (X = S, Se) ternary semiconductors by employing the density functional theory. NdSF and NdSeF have predicted band gaps of 1.79 eV and 1.50 eV, respectively. The p states of both chalcogens play an important role in the bonding properties and electronic structure of these materials. These materials displayed metallic behavior, as evidenced by the negative values of ε<sub>1</sub><sup>xx</sup>(ω) and ε<sub>1</sub><sup>zz</sup>(ω). The reflectivity spectra increase gradually up to 4.0 eV, showing that these materials absorb more light as photon energy increases. The thermoelectric properties were also investigated, such as the thermal conductivity, Figure of Merit, electrical conductivity, and Seebeck coefficient. The current study could demonstrate its potential application in advanced optoelectronic devices, paving the path for a wide variety of innovations.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 10","pages":"3643 - 3655"},"PeriodicalIF":1.7,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880939","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}
Mohammad Jafar Naseri, Abbas Ghadimi, Abdollah Eskandarian
{"title":"Optimization of two terminal tandem Perovskite/Si solar cells with theoretical modeling","authors":"Mohammad Jafar Naseri, Abbas Ghadimi, Abdollah Eskandarian","doi":"10.1007/s12648-025-03571-7","DOIUrl":"10.1007/s12648-025-03571-7","url":null,"abstract":"<div><p>In this paper, an experiment involving two-terminal (2 T) tandem perovskite/Si solar cells was used as the validation case for the simulation. Subsequently, we analyzed the hole transport layer (HTL) in the perovskite (PSK) solar cell, which served as the top cell. The results demonstrate that increasing the bandgap leads to a drop in the open-circuit voltage (Voc), while the fill factor (FF) and efficiency increase, and the short-circuit current density (Jsc) remains constant. The valence band offset for the higher bandgap creates a spike against barriers, causing the Voc to decrease. However, during recombination, the interface recombination is reduced, resulting in enhanced FF and efficiency. The electron affinity of the HTL also significantly impacts efficiency. A range of 2.3–2.6 eV is suitable for highly efficient PSK/Si tandem solar cells. Lower electron affinity values create a cliff that facilitates carrier transport through the PSK layer, reduces recombination rates, and leads to higher efficiency. Materials with higher electron mobility and acceptor density are ideal for selecting HTL materials. Finally, we identified an optimal HTL configuration that enables a tandem device to achieve 2% higher efficiency compared to the reference case. This study highlights the importance of HTL materials in tandem devices.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 10","pages":"3909 - 3914"},"PeriodicalIF":1.7,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880920","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}
Rahul Kumar Chaturvedi, Nilam Venkata Koteswararao, S. D. Ram, L. P. Singh
{"title":"On the evolution of shock waves in Van der Waals reacting gas with small solid dust particles","authors":"Rahul Kumar Chaturvedi, Nilam Venkata Koteswararao, S. D. Ram, L. P. Singh","doi":"10.1007/s12648-025-03559-3","DOIUrl":"10.1007/s12648-025-03559-3","url":null,"abstract":"<div><p>This study delves into the evolutionary dynamics of shock wave within the context of van der Waals reacting gas, particularly when small dust particles are present. The investigation involves an analysis of the governing equations in various coordinate systems, followed by a reformulation of these equations into Bernoulli’s differential equation. Through our analysis, we uncover nonlinear phenomena in the physical domain, elucidating the influence of reacting gas parameters on the propagation of expansive waves. Additionally, we investigate the impact of dust particles on wave behavior, exploring both their role in wave growth and decay. Moreover, we examine the significance of the transport equation in dictating the progression of shock wave, deriving relationships that elucidate the formation of shocks. To provide comprehensive insights, we conduct a comparative analysis across different flow geometries, including planar, circular, and spherical symmetric flows, to evaluate the effects of reacting gas parameters and small dust particles on flow patterns and the distortion of shock wave.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 10","pages":"3865 - 3877"},"PeriodicalIF":1.7,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880917","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}
R. T. Abdullateef, Sirwan Kareem Jalal, Raed Hashim Al-Saqa, Anjani Kumar Pandy
{"title":"Vibrational characteristics of ZnS phase B1 under high pressure","authors":"R. T. Abdullateef, Sirwan Kareem Jalal, Raed Hashim Al-Saqa, Anjani Kumar Pandy","doi":"10.1007/s12648-024-03528-2","DOIUrl":"10.1007/s12648-024-03528-2","url":null,"abstract":"<div><p>High pressure induces vital characterizations in solid materials making them attractive for variety of applications. This study investigated the effect of high pressure on vibrational properties of ZnS using two different equations of state (EoS); Dodson EoS and Bardeen EoS. Thermal and mechanical characterizations, such as volume compression ratio, bulk modulus, Grüneisen parameter, Debye temperature, and the phonon density of states are considered to study. The volume compression ratio calculated due to the two considered EoSs seems to be equivalent to each other up to 17 Gpa, along with a good agreement with published data to a pressure of around 12 Gpa. The bulk modulus of ZnS is increased from 70 GPa at ambient pressure to around 135 Gpa under high pressure of 17 Gpa. Furthermore, the Grüneisen parameter at atmospheric pressure is 1.2, it is slightly decreasing to reach around 1.03 at the highest applied pressure. The present optimization investigates the phonon frequency spectrum of ZnS at different pressures values of (6, 9 and 12) Gpa. Increasing in the energy of the active modes along with decreasing the number of the exited modes are observed. The last calculation, evaluates high pressure effects on the Debye temperature of the material by using two model formulations in combining with the considered EoSs. It is found that the Debye pressure is considerably boosted from 257 °C to around 300 °C at the pressure of 15 GPa.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 8","pages":"2885 - 2892"},"PeriodicalIF":1.7,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164183","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}
N. Yilmaz Canli, D. Vardar, P. Kavak, M. Uyunmaz, H. Akdaş Kılıç, H. Ocak, B. Bilgin Eran
{"title":"Investigation of dielectric properties of 5CB and chiral pyridine based liquid crystal composites","authors":"N. Yilmaz Canli, D. Vardar, P. Kavak, M. Uyunmaz, H. Akdaş Kılıç, H. Ocak, B. Bilgin Eran","doi":"10.1007/s12648-025-03561-9","DOIUrl":"10.1007/s12648-025-03561-9","url":null,"abstract":"<div><p>Liquid crystals (<b>LCs</b>) are materials that are becoming increasingly important due to their applications such as liquid crystal displays and many other applications. Only one LC cannot meet all the parameters required for applications. This study focused on investigating changes in dielectric properties with mixtures of <b>LCs</b> at different concentrations. The dielectric characterization of liquid crystal composites <b>5CB</b> (4-cyano-4'-pentylbiphenyl) doped with <b>LC1</b> ((S)-4-(3,7-Dimethyloctyloxy)phenyl 6-(4-dodecyloxyphenyl)pyridine-3-carboxylate) and <b>LC2</b> ((S)-4-(2-Methylbutoxy)phenyl 6-(4-dodecyloxyphenyl)pyridine-3-carboxylate) and at 2 and 5 wt%) were investigated. Dielectric parameters (ε′, ε′′, ∆ε<sub><i>s</i></sub>) of <b>5CB, 5CB+(2wt.%)LC1, 5CB+(5wt.%)LC1, 5CB+(2wt.%)LC2, 5CB+(5wt.%)LC2</b> have been calculated. The <b>LC1</b> and <b>LC2</b> compounds exhibit the SmC* and SmA mesophases. In our study, it was observed that the addition of <b>LC1</b> and <b>LC2</b> to <b>5CB</b> increased the mobility of polar molecules, which increases the dielectric strength (∆ε<sub><i>s</i></sub>).</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 9","pages":"3331 - 3340"},"PeriodicalIF":1.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12648-025-03561-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Dynamics and synchronization of quantum cellular neural networks via manifold technology","authors":"S. -f Wang, R. -c Gan, H. -m He","doi":"10.1007/s12648-025-03558-4","DOIUrl":"10.1007/s12648-025-03558-4","url":null,"abstract":"<div><p>This work solves the problem of maintaining consistency of robust connections for four-order quantum cellular neural networks (QCNNs) with limited communication range. Considering the limited communication capabilities of neural networks in practical applications, this research presents an innovative method that involves incorporating quantum-dot cellular automata (QCA) designed to ensure continuous communication connections within a QCNN. Additionally, a generalized synchronization for two four-order QCNNs is designed via manifold technology. Following the Lyapunov theorem and the control theory, this research concludes that, under specific conditions, two QCNNs can obtain the consensus synchronization. Moreover, an advanced control method named a linear manifold control scheme is described to reduce the chattering phenomenon in synchronization. Numerical example demonstrates the effectiveness and advantage of the proposed approach.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 9","pages":"3423 - 3428"},"PeriodicalIF":1.7,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145160834","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}
{"title":"Effects on structural properties of doping zinc into Sn2Ba(Cu2−xZnx)2Oy ceramics","authors":"S. Büyükakkaş, Ş. Ünlüer","doi":"10.1007/s12648-025-03551-x","DOIUrl":"10.1007/s12648-025-03551-x","url":null,"abstract":"<div><p>The study manifests the effects of different amounts of Zn doping on the structure of the nano ZnO-doped Sn<sub>2</sub>Ba(Cu<sub>2−x</sub>Zn<sub>x</sub>)<sub>2</sub>O<sub>y</sub> [x = 0.0,0.4,0.8,1.0] compounds synthesized by the solid state-reaction method. The structural changes in the produced materials have been characterized by differential thermal analysis (DTA), thermal gravimetric analysis (TGA), X-ray diffraction spectrometry (XRD), and scanning electron microscopy (SEM) methods. In the DTA analysis, while the endotherm was observed at 860 C in the pure material, the endotherms were at 810 and 880 C in the doped S10 material. The microstructure and surface morphology of pure and doped samples were analyzed using the SEM imaging method. SEM images show that the porous structure expected in Sn-based ceramics decreases and the grain size increases with the amount of Zn doping. XRD data were used to examine the crystal structures and determine the crystal phases. The effect of the ZnO dopant amount on phase transition was revealed. When the XRD peaks of the pure and doped samples are examined, it is seen that the lattice structures of both contain orthorhombic and tetragonal unit cells. It is determined Zn doping disrupts the structure of the orthorhombic 212 phase and has a positive effect on the development of the tetragonal 211 phase. It is determined that variation in the a, b, and c lattice parameters calculated using XRD data of Zn-doped materials is not monotonous. XRD analysis showed that the samples have Pmmm for the orthorhombic crystal structure and P4/mmm symmetry for the tetragonal crystal structure.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 9","pages":"3275 - 3287"},"PeriodicalIF":1.7,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12648-025-03551-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Investigation of mass and decay characteristics of the light-strange tetraquark","authors":"Chetan Lodha, Ajay Kumar Rai","doi":"10.1007/s12648-024-03524-6","DOIUrl":"10.1007/s12648-024-03524-6","url":null,"abstract":"<div><p>Motivated by recent developments in tetraquark studies, we investigate the mass spectra and decay properties of light-strange tetraquarks (<span>(sq{bar{s}}{bar{q}},ss{bar{q}}{bar{q}})</span>) in diquark-antidiquark formalism. By considering different internal quark structures and internal color structures, mass spectra are generated in semi-relativistic and non-relativistic frameworks. For decay widths, the annihilation model and spectator model have been incorporated. Several resonances have been explored as potential candidates for these tetraquarks. Concurrently, mass spectra and several decay channels of kaons (<span>(s{bar{q}},q{bar{s}})</span>) are also investigated. This study is carried out in the hope of helping improve the understanding of tetraquarks in the light-light sector.\u0000</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 8","pages":"3055 - 3081"},"PeriodicalIF":1.7,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169313","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}
Durgesh Singh, Akhilesh Kumar Patel, Barnabha Bandyopadhyay, R. Venkatesh, Satyam Kumar, K. G. Suresh
{"title":"A comparative study of the structural, magnetic and electrical properties of Ni50Mn20(Ni/Co)5Ga25","authors":"Durgesh Singh, Akhilesh Kumar Patel, Barnabha Bandyopadhyay, R. Venkatesh, Satyam Kumar, K. G. Suresh","doi":"10.1007/s12648-025-03565-5","DOIUrl":"10.1007/s12648-025-03565-5","url":null,"abstract":"<div><p>We have investigated the influence of Ni and Co doping for Mn in Ni<sub>50</sub>Mn<sub>20</sub>(Ni/Co)<sub>5</sub>Ga<sub>25</sub> by means of XRD, optical microscopy, resistivity and magnetization measurements. Both the alloys are martensitic at room temperature. Temperature-dependent XRD data shows that the martensitic transition in the Ni and Co doped sample occurs close to 700 K and 900 K respectively. Hysteresis seen in the resistivity and magnetization studies on both the samples in the martensitic regime is attributed to the dynamics associated with the ferromagnetic clusters developed just below T<sub>C</sub>. By comparing the results on the two alloys, we show that the differences in their structural, magnetic and electrical properties can be mainly attributed to the difference in the electronic band structure brought about by these two (Ni vs. Co) substituents.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 10","pages":"3631 - 3641"},"PeriodicalIF":1.7,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880765","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}