I. Mallek-Zouari , A.E. Maayoufi , R. Bez , A. Kouki , N. Thabet-Mliki
{"title":"Investigation of the Structural, Dielectric, Optical, and Electronic Properties of Hydrothermally Synthesized Bi2Fe4O9 Multiferroic Materials","authors":"I. Mallek-Zouari , A.E. Maayoufi , R. Bez , A. Kouki , N. Thabet-Mliki","doi":"10.1016/j.cjph.2025.11.033","DOIUrl":"10.1016/j.cjph.2025.11.033","url":null,"abstract":"<div><div>Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> (BFO) was synthesized using a hydrothermal method to achieve controlled phase purity and morphology. Rietveld refinement of the X-ray diffraction (XRD) pattern confirmed the formation of a single orthorhombic phase with the <em>Pbam</em> space group. Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) analyses revealed plate-like particles with dimensions ranging from 140 to 170 nm along their edge. The dielectric properties were evaluated by analyzing the frequency dependence of the dielectric constant, loss tangent, and electrical conductivity. The results indicated that the optimization of synthesis parameters significantly enhanced the dielectric response of Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub>, resulting in improved high-frequency performance. The correlation between microstructural characteristics and dielectric properties is discussed, with an emphasis on the roles of grain boundaries, phase purity, and conductivity in determining dielectric behavior. The UV-Vis absorption spectra recorded at room temperature revealed substantial absorption within the ultraviolet range (200–400 nm). Tauc plot analysis yielded an estimated band gap value of approximately 1.97 eV. Density functional theory (DFT) calculations, performed using the generalized gradient approximation (GGA+U) with the Wien2k code, provided insights into the electronic band structure and density of states (DOS). The calculated results are in good agreement with the experimental findings. This study highlights Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub> as a promising material for advanced dielectric and environmental applications.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 79-95"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Wenbin Lv , Jinyang He , Han Cao , Chudong Xu , Ming-Hui Lu
{"title":"Fractional mode charges in acoustic non-Hermitian topological Anderson insulator","authors":"Wenbin Lv , Jinyang He , Han Cao , Chudong Xu , Ming-Hui Lu","doi":"10.1016/j.cjph.2025.11.032","DOIUrl":"10.1016/j.cjph.2025.11.032","url":null,"abstract":"<div><div>The investigation of non-Hermitian topological systems has attracted significant attention across diverse fields, including photonics and acoustics. Recent studies have demonstrated that disorder can induce topological states in otherwise trivial systems, leading to the discovery of Non-Hermitian topological Anderson insulator (NH-TAI). This study explores the effects of non-Hermitian disorder on acoustic systems through numerical simulations and theoretical calculation. Coupled acoustic cavity arrays with non-Hermitian disorder profiles in one- and two-dimensional configurations are investigated. The findings reveal that tuning the disorder strength can induce a transition from a trivial to a nontrivial topological phase. More importantly, by calculating the fractional mode charges through integration of the local density of states (LDOS) within the band gap, it is demonstrated that non-Hermitian disorder alone can induce a topological Anderson phase characterized via fractional mode charges. Additionally, the robustness of the system is confirmed by simulating structural defects. These findings are applicable to other physical platforms, such as optics, and pave a pathway for future research in non-Hermitian acoustics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 96-103"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Zhi-Chu Chen, Qingyu Cai, Ji-Yong Fu, Zhong-Xiao Man
{"title":"The impact of coherence in non-equilibrium reservoirs on the functionality and performance of quantum thermal machines","authors":"Zhi-Chu Chen, Qingyu Cai, Ji-Yong Fu, Zhong-Xiao Man","doi":"10.1016/j.cjph.2025.12.031","DOIUrl":"10.1016/j.cjph.2025.12.031","url":null,"abstract":"<div><div>We investigate the functionality and performance of quantum thermal machines (QTMs) implemented using multipartite open quantum systems coupled to independent non-equilibrium reservoirs. We focus on two distinct types of work in QTMs, namely, the work arising from the coherence of reservoirs and that supplied by an external source. With two- and three-body interactions within the working substance, we demonstrate that QTMs in the presence of reservoir coherence can attain unique operational modes unattainable in purely thermal reservoirs. Furthermore, the QTMs can perform both single tasks driven by multiple inputs and hybrid operations driven by a single input. We define a non-equilibrium free-energy-based efficiency to assess the performance of this class of QTMs. Within specific parameter ranges, reservoir coherence can be harnessed to enhance the efficiency of QTMs. Our findings offer valuable insights for designing QTMs with customized functions and for optimizing their performance by leveraging coherence in non-equilibrium reservoirs.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 549-562"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145921008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Influence of bleb formation on intracranial aneurysm hemodynamics: a patient-specific CFD study","authors":"Li Song , Peng Du , Erhao Bao","doi":"10.1016/j.cjph.2025.12.011","DOIUrl":"10.1016/j.cjph.2025.12.011","url":null,"abstract":"<div><div>Intracranial aneurysms with secondary bleb formation are considered to have an elevated risk of rupture due to localized geometric and hemodynamic instabilities. In this study, we perform a comparative computational fluid dynamics (CFD) analysis on five patient-specific aneurysm geometries, examining pre- and post-bleb configurations to evaluate hemodynamic changes associated with bleb development. Key metrics including wall shear stress (WSS), sac wall pressure, and intra-aneurysmal velocity were analyzed at peak systolic time points while oscillatory shear index (OSI) is obtained vial whole cardiac cycle. Results indicate that bleb formation introduces localized flow disturbances and hemodynamic variability, with case-dependent effects. Quantitatively, bleb regions exhibited up to a 36% reduction in mean WSS (e.g., Case E: 13.3 Pa → 9.8 Pa) and up to a 4-fold increase in minimum WSS (e.g., Case C: 0.21 Pa → 0.72 Pa in the bleb), reflecting strong spatial heterogeneity in shear loading. Despite these hemodynamic changes, the vessel wall in bleb regions becomes thinner and structurally weaker, reducing its resistance to blood pressure and thereby increasing rupture susceptibility. These findings emphasize the importance of multi-parametric hemodynamic evaluation—particularly WSS magnitude, OSI distribution, and flow patterns—in understanding bleb-induced changes in aneurysm stability. The study underscores the need for individualized risk assessment strategies that go beyond morphological classification alone.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 412-425"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Julija R. Šćepanović , Danica Stojiljković , Zorica M. Jakšić , Ljuba Budinski-Petković , Slobodan B. Vrhovac
{"title":"Simulation study of reversible random sequential adsorption of lattice animals on a three-dimensional cubic lattice","authors":"Julija R. Šćepanović , Danica Stojiljković , Zorica M. Jakšić , Ljuba Budinski-Petković , Slobodan B. Vrhovac","doi":"10.1016/j.cjph.2025.12.010","DOIUrl":"10.1016/j.cjph.2025.12.010","url":null,"abstract":"<div><div>The properties of the reversible Random Sequential Adsorption (RSA) of objects of various shapes on a simple three-dimensional (3D) cubic lattice are studied numerically using Monte Carlo simulations. Depositing objects are “lattice animals” made of a certain number of nearest-neighbor sites on a lattice. This work aims to investigate the impact of the geometrical properties of shapes on the temporal evolution of the density <em>θ</em>(<em>t</em>). We analyzed all lattice animals of size <span><math><mrow><mi>n</mi><mo>=</mo><mn>1</mn><mo>,</mo><mn>2</mn><mo>,</mo><mn>3</mn><mo>,</mo></mrow></math></span> and 4. The approach of the density <em>θ</em>(<em>t</em>) to the equilibrium density <em>θ</em><sub>∞</sub> is found to be stretched exponential, <span><math><mrow><msub><mi>θ</mi><mi>∞</mi></msub><mo>−</mo><mi>θ</mi><mrow><mo>(</mo><mi>t</mi><mo>)</mo></mrow><mo>∼</mo><mi>exp</mi><mrow><mo>(</mo><mo>−</mo><msup><mrow><mo>(</mo><mi>t</mi><mo>/</mo><mi>τ</mi><mo>)</mo></mrow><mi>β</mi></msup><mo>)</mo></mrow></mrow></math></span>, for all lattice animals. The characteristic time scale <em>τ</em> was found to decrease with the probability of desorption <span><math><msub><mi>P</mi><mtext>des</mtext></msub></math></span> according to the power law, <span><math><mrow><mi>τ</mi><mo>=</mo><mi>A</mi><mspace></mspace><msup><mrow><mo>(</mo><msub><mi>P</mi><mtext>des</mtext></msub><mo>)</mo></mrow><mrow><mo>−</mo><mi>γ</mi></mrow></msup></mrow></math></span>. The exponent <em>γ</em> remains unchanged in all shapes of the same size. The parameter <em>A</em> changes depending on the number of different orientations <em>m</em> that the lattice animals can take when placed on a cubic lattice. Orientations of the lattice animal deposited in two randomly chosen places on the lattice are different if one of them cannot be translated into the other. Our findings indicate that the deposition dynamics slows significantly as <em>m</em> decreases. Furthermore, for objects of the same size, the value of parameter <em>β</em> increases with the number of possible orientations <em>m</em> of the shape. The structural heterogeneity in the local relaxation dynamics gives rise to a stretched exponential behavior of the density <em>θ</em>(<em>t</em>) with a lower value of <em>β</em>.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 254-265"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Jacqueline Do Rosario e Souza , Bhagya Mathapati , Ravi Ragoju , Dhananjay Yadav
{"title":"Global stability analysis on the onset of convection in an inclined porous layer with Casson fluid under the effect of viscous dissipation and along-slope buoyancy induced throughflow","authors":"Jacqueline Do Rosario e Souza , Bhagya Mathapati , Ravi Ragoju , Dhananjay Yadav","doi":"10.1016/j.cjph.2025.12.001","DOIUrl":"10.1016/j.cjph.2025.12.001","url":null,"abstract":"<div><div>This study investigates the onset of thermal convection within a Casson fluid-saturated, inclined porous layer and accounting for the effect of viscous dissipation and along-slope buoyancy induced throughflow. The system consists of two parallel plates with an angle of inclination, <em>ϕ</em> from the horizontal and is analyzed using linear and nonlinear stability characteristics. Darcy law is used to describe the flow. The governing equations, including continuity, momentum, and energy balances, are first non-dimensionalized to introduce key parameters such as the Darcy–Rayleigh number, the Gebhart number, inclination angle, and the Casson fluid index. Linear stability analysis of disturbances is conducted by applying a normal mode technique. To complement the linear analysis, nonlinear stability is examined using the energy method, where an energy functional is constructed to determine thresholds for global nonlinear stability. The boundary eigenvalue problem in the two analyses are solved using the boundary value problem solver <span>bvp4c</span> routine in MATLAB. Comparisons between linear and nonlinear analyses are presented, supported by graphical representations of stability boundaries. The results reveal that longitudinal rolls are the most unstable modes and that inclination has a stabilizing effect, while the non-Newtonian nature of the Casson fluid tends to reduce the stability threshold. Increasing Gebhart number (stronger viscous dissipation) promotes instability, and along-slope buoyancy induced throughflow directionally shifts neutral curves-either amplifying or offsetting dissipation-induced destabilization depending on its direction. These findings provide insights into the complex interplay between fluid rheology, thermal dissipation, and system geometry, contributing to the understanding of thermal convection in porous media filled with non-Newtonian fluids.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 305-321"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Ren Guo , Miaofang Zhou , Guangtao Cao , Fan He , Jingfeng Tian , Shuyu Qiao , Hui Yang , Hairong He , Zhiying Zhu , Shaobo Liu , Tao Yu , Min Pan , Hongchao Yi , Gengbiao Lu , Yan Deng , Enduo Gao
{"title":"Polarization -multiplexing response based on Quasi-BIC in Quasi-flatband","authors":"Ren Guo , Miaofang Zhou , Guangtao Cao , Fan He , Jingfeng Tian , Shuyu Qiao , Hui Yang , Hairong He , Zhiying Zhu , Shaobo Liu , Tao Yu , Min Pan , Hongchao Yi , Gengbiao Lu , Yan Deng , Enduo Gao","doi":"10.1016/j.cjph.2025.12.018","DOIUrl":"10.1016/j.cjph.2025.12.018","url":null,"abstract":"<div><div>Plasmon-induced transparency (PIT) faces limitations in integrated photonics due to low Q factors (<50) and restricted polarization control. This work integrates quasi-bound states in the continuum (QBIC) with guided-mode resonance (GMR), effectively utilizing the material advantages of silicon and silver to achieve the like-plasmon-induced absorption (like-PIA) phenomenon. This approach significantly reduces the losses associated with traditional plasmon-induced absorption (PIA) and overcomes the limitations related to performance and polarization sensitivity. Through symmetry breaking, the structure realizes dual-peak perfect absorption (98.1%/98.2%) and ultra-high Q factors (1076/816) in the near-infrared band, enhancing performance two orders over traditional devices. Band structure analysis reveals a quasi-flat band effect, rendering QBIC-controlled peaks insensitive to multi-parameter dispersion. Crucially, the dual peaks exhibit multiplexing polarization: the polarization-insensitive QBIC peak enables stable self-calibrating sensing, while the GMR-driven peak supports dynamic polarization encoding and band switching, enabling multi-parameter sensing and communication multiplexing. Additionally, the system achieves a 15.1 ps group delay, surpassing existing slow light devices. This breakthrough paves the way for polarization-multiplexed communication, environmental sensing, and multifunctional on-chip photonics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 225-235"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Mean energy, entropy, and specific heat of monolayer black phosphorus in the presence of a magnetic field: Non-extensive formalism","authors":"Chunyang Li , Zhanjun Li , Liu Long","doi":"10.1016/j.cjph.2025.11.027","DOIUrl":"10.1016/j.cjph.2025.11.027","url":null,"abstract":"<div><div>A monolayer of black phosphorus (BP) is examined in the presence of an external magnetic field. The electronic energy spectrum is obtained through a tight-binding Hamiltonian, after which the non-extensive Tsallis statistical formalism is employed to evaluate the thermodynamic behavior of the system. Within this framework, the entropy, mean energy, and specific heat of the monolayer BP are systematically calculated. The results indicate that the specific heat exhibits a pronounced peak, characteristic of a Schottky-type anomaly at low temperatures. The position of this peak is temperature-dependent, while its amplitude varies with both the applied magnetic field and the non-extensive parameter q. Moreover, both the entropy and the mean energy increase monotonically with rising temperature, whereas an increase in magnetic field strength reduces the entropy at a fixed temperature.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 104-111"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Oscillatory electro-magneto-hydrodynamics of third-grade fluid microflows","authors":"Ruikang Yang , Zhiyong Xie , Yongjun Jian","doi":"10.1016/j.cjph.2025.11.028","DOIUrl":"10.1016/j.cjph.2025.11.028","url":null,"abstract":"<div><div>Oscillatory electrokinetic microflows of third-grade fluids exhibit complex multi-physics coupling that challenges conventional microfluidic control. This work establishes a dynamic electro-magneto-hydrodynamic (EMHD) model based on the Debye-Hückel linearization and regular perturbation method. To address the high-order nonlinearity and transient characteristics of the momentum equation for third-grade fluids, the regular perturbation and Laplace transform approach are employed for the first time to solve the equation, deriving a semi-analytical solution that decouples transient startup and quasi-periodic flow regimes through term decomposition. Analysis reveals that memory effects—governed by the non-Newtonian dimensionless parameter <em>a</em><sub>1</sub>, which characterizes the fluid’s shear energy storage capacity—enhance oscillatory diffusion depth while suppressing velocity amplitudes as <em>a</em><sub>1</sub> increases. Notably, domain-wide shear stress vanishes under the extreme condition <em>a</em><sub>1</sub>→∞. Synergistic analysis shows that electromagnetic field tuning optimizes flow rate via the force balance condition <em>Ha</em> ≈ 1.6/<span><math><mi>η</mi></math></span> (obtained from isocontour maximization) and achieves the peak pumping efficiency while maintaining enhanced mixing efficiency through near-wall oscillations. This framework culminates in an optimized parameter set, providing a theoretical guideline for designing microfluidic devices that balance high pumping efficiency with enhanced mixing efficiency.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 122-138"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Shahzadi Noreen , Ayesha Awais , A.F. Abd El-Rehim , Amna Parveen , Heba Y Zahran , I.S. Yahia , Zeesham Abbas
{"title":"Synergistic experimental–dft investigation into photocatalytic efficiency of M-Type XFe12O19 (X = Ba, Sr) hexaferrites","authors":"Shahzadi Noreen , Ayesha Awais , A.F. Abd El-Rehim , Amna Parveen , Heba Y Zahran , I.S. Yahia , Zeesham Abbas","doi":"10.1016/j.cjph.2025.11.024","DOIUrl":"10.1016/j.cjph.2025.11.024","url":null,"abstract":"<div><div>The XFe<sub>12</sub>O<sub>19</sub> (X = Ba, Sr) M-type hexaferrites were successfully synthesized using the sol-gel auto-combustion process to examine their structural, morphological, electronic, photocatalytic, and optical properties, supported by density functional theory (DFT) calculations. This work combines comprehensive experiments with first-principles calculations to clearly and comparatively explain how substituting Sr²⁺ and Ba²⁺ into the M-type XFe<sub>12</sub>O<sub>19</sub> (X = Ba, Sr) structure influences the lattice, alters the electronic and optical characteristics, and impacts the material's photocatalytic behavior. The XRD analysis confirms single-phase hexagonal magnetoplumbite structures (P63/mmc) without secondary phases, with experimentally measured crystalline sizes of 44.54 nm for BaFe<sub>12</sub>O<sub>19</sub> and 33.72 nm for SrFe<sub>12</sub>O<sub>19</sub>. The structural properties of both hexaferrites show good agreement between theoretical and experimental results. SEM images reveal plate-like morphologies with agglomerated grains, while EDX analysis confirms a stoichiometric composition. The simulated electronic band structures show direct transitions in these compositions, and calculated values match experimental results. Optical studies identify direct energy band gaps of 2.676 eV for BaFe<sub>12</sub>O<sub>19</sub> and 1.602 eV for SrFe<sub>12</sub>O<sub>19</sub>, as determined by UV-Vis spectroscopy. BaFe<sub>12</sub>O<sub>19</sub> and SrFe<sub>12</sub>O<sub>19</sub> hexaferrites degraded Methylene Blue by 81% and 97%, respectively, demonstrating that the first-order kinetic model fits well with the excellent photocatalytic oxidation. Theoretical findings align with experimental results from FTIR, UV–Vis, PL, and photocatalytic tests, confirming that these compositions are promising for photocatalytic applications.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 199-212"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}