Pub Date : 2025-12-10DOI: 10.1016/j.ssc.2025.116281
Reddithota Vidyasagar , Suresh Kumar Jakka
We report the observation of a resonant excitonic band in high-quality bilayer graphene (BLG) grown by chemical vapor deposition on copper. Raman spectra show the characteristic D, G, and 2D peaks, confirming the BLG nature through G-to-2D intensity ratio. Optical absorbance measurements reveal two distinct features: (i) an asymmetric optical absorbance peak at 4.64 eV attributed to a resonant excitonic interband transition between bonding and anti-bonding π states near the M-point (the midpoints of the edges) of the Brillouin zone. The measured optical absorbance is 4.8 % in the visible range is consistent with previous studies. (ii) optical absorbance peak appeared at 1.49 eV could be attributed to a specific feature of the BLG band structure. These results provide new insights into resonant excitonic effects in the BLG band structure.
{"title":"Observation of resonant excitonic band in bilayer graphene","authors":"Reddithota Vidyasagar , Suresh Kumar Jakka","doi":"10.1016/j.ssc.2025.116281","DOIUrl":"10.1016/j.ssc.2025.116281","url":null,"abstract":"<div><div>We report the observation of a resonant excitonic band in high-quality bilayer graphene (BLG) grown by chemical vapor deposition on copper. Raman spectra show the characteristic D, G, and 2D peaks, confirming the BLG nature through G-to-2D intensity ratio. Optical absorbance measurements reveal two distinct features: (i) an asymmetric optical absorbance peak at 4.64 eV attributed to a resonant excitonic interband transition between bonding and anti-bonding π states near the M-point (the midpoints of the edges) of the Brillouin zone. The measured optical absorbance is 4.8 % in the visible range is consistent with previous studies. (ii) optical absorbance peak appeared at 1.49 eV could be attributed to a specific feature of the BLG band structure. These results provide new insights into resonant excitonic effects in the BLG band structure.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"409 ","pages":"Article 116281"},"PeriodicalIF":2.4,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837313","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}
Pub Date : 2025-12-10DOI: 10.1016/j.ssc.2025.116280
Howaida Mansour , Nada Alfryyan , B. Alshahrani , M.S. Al-Buriahi , Z.A. Alrowaili
Researchers have been investigating new alloys such as CoZrVx in order to achieve higher levels of performance. The present study examines the gamma attenuation characteristics of CoZrVx alloys through WinXCOM simulations, with the goal of improving our comprehension of their effectiveness as radiation barriers. We use advanced computational modeling and analysis to understand how the alloy can reduce gamma radiation. This is important for its use in nuclear medicine, aerospace, and industrial applications. The findings demonstrate the potential of CoZrVx alloys as effective materials for shielding against radiation in future technologies. In addition, this research goes beyond traditional alloy testing by combining modern modeling approaches with practical gamma dose rate predictions. The alloys' Effective Atomic Number (Zeff), Electron Density (Neff), Mass attenuation coefficient (MAC), Mass energy-absorption coefficient (MEAC), gamma ray constant, gamma dose rate and exposure buildup factor (EBF) are also evaluated, so it is providing further insights into their interactions. Through the comparison of theoretical predictions and actual data, we develop a strong framework for assessing the performance of CoZrVx alloys in various radiation environments. This technique not only confirms the effectiveness of the materials but also establishes the foundation for enhancing the composition of materials to fulfill unique shielding needs in different radiation situations. This study ultimately enhances the field of radiation protection by utilizing novel alloy design and simulation-based assessment approaches.
{"title":"Gamma radiation attenuation factors of Zr-alloys for advanced shielding applications","authors":"Howaida Mansour , Nada Alfryyan , B. Alshahrani , M.S. Al-Buriahi , Z.A. Alrowaili","doi":"10.1016/j.ssc.2025.116280","DOIUrl":"10.1016/j.ssc.2025.116280","url":null,"abstract":"<div><div>Researchers have been investigating new alloys such as CoZrVx in order to achieve higher levels of performance. The present study examines the gamma attenuation characteristics of CoZrVx alloys through WinXCOM simulations, with the goal of improving our comprehension of their effectiveness as radiation barriers. We use advanced computational modeling and analysis to understand how the alloy can reduce gamma radiation. This is important for its use in nuclear medicine, aerospace, and industrial applications. The findings demonstrate the potential of CoZrVx alloys as effective materials for shielding against radiation in future technologies. In addition, this research goes beyond traditional alloy testing by combining modern modeling approaches with practical gamma dose rate predictions. The alloys' Effective Atomic Number (Z<sub>eff</sub>), Electron Density (N<sub>eff</sub>), Mass attenuation coefficient (MAC), Mass energy-absorption coefficient (MEAC), gamma ray constant, gamma dose rate and exposure buildup factor (EBF) are also evaluated, so it is providing further insights into their interactions. Through the comparison of theoretical predictions and actual data, we develop a strong framework for assessing the performance of CoZrVx alloys in various radiation environments. This technique not only confirms the effectiveness of the materials but also establishes the foundation for enhancing the composition of materials to fulfill unique shielding needs in different radiation situations. This study ultimately enhances the field of radiation protection by utilizing novel alloy design and simulation-based assessment approaches.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"409 ","pages":"Article 116280"},"PeriodicalIF":2.4,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797243","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}
Pub Date : 2025-12-09DOI: 10.1016/j.ssc.2025.116278
Yipeng Xiao , Qiubo Hu , Yudi Fan , Yuke Meng , Bingxu Huo , Shuang Liu , Wenbo Luo , Fengzi Zhou , Hao Li , Zhiyu Min , Xiaofei Wang
In this study, 82NaNbO3-18CaTiO3-xwt%MnO2 lead-free ceramics were prepared using the traditional solid-state method. The effects of different MnO2 doping levels (x = 0, 1, 2, 3) on the phase structure, microstructure, and dielectric properties of the materials were systematically investigated. The XRD analysis indicated that all samples displayed a stable perovskite structure and no secondary phase was detected, and Rietveld refinement analysis showed good fits for all samples, with GoF less than 2. As the amount of MnO2 doping increases, the diffraction peak shifts towards a smaller angle, suggesting that Mn2+/Mn3+ substitutes for B-site ions, resulting in lattice expansion. The SEM results indicate that doping with MnO2 significantly inhibits grain growth, and the average grain size decreases to 3.3 μm at x = 3, which is attributed to excessive MnO2 hindering grain boundary migration at grain boundaries. The dielectric properties tests indicate that εr and tanδ can be tuned by doping with MnO2, and the sample with x = 1 exhibits excellent temperature stability. In order to further analyze the dielectric properties of the samples, the electrical modulus (M") results showed a relaxation phenomenon, and the activation energy (Ea) was calculated by Arrhenius relationship. It was found that the change in the Ea value may be closely related to the OVs compensation mechanism. The existence of OVs was further confirmed by XPS analysis and its relationship with the MnO2 doping content was explained. Impedance measurements indicate that doping with MnO2 significantly improves the insulation performance of the material. The Ea was calculated, and the reasons for its variation were discussed. This study provides an experimental reference for the optimization of dielectric properties and defect regulation of lead-free antiferroelectric ceramic materials.
{"title":"The effects of MnO2 doping on the structure, dielectric properties and oxygen vacancies of 82NaNbO3-18CaTiO3 lead-free ceramics","authors":"Yipeng Xiao , Qiubo Hu , Yudi Fan , Yuke Meng , Bingxu Huo , Shuang Liu , Wenbo Luo , Fengzi Zhou , Hao Li , Zhiyu Min , Xiaofei Wang","doi":"10.1016/j.ssc.2025.116278","DOIUrl":"10.1016/j.ssc.2025.116278","url":null,"abstract":"<div><div>In this study, 82NaNbO<sub>3</sub>-18CaTiO<sub>3</sub>-xwt%MnO<sub>2</sub> lead-free ceramics were prepared using the traditional solid-state method. The effects of different MnO<sub>2</sub> doping levels (x = 0, 1, 2, 3) on the phase structure, microstructure, and dielectric properties of the materials were systematically investigated. The XRD analysis indicated that all samples displayed a stable perovskite structure and no secondary phase was detected, and Rietveld refinement analysis showed good fits for all samples, with GoF less than 2. As the amount of MnO<sub>2</sub> doping increases, the diffraction peak shifts towards a smaller angle, suggesting that Mn<sup>2+</sup>/Mn<sup>3+</sup> substitutes for B-site ions, resulting in lattice expansion. The SEM results indicate that doping with MnO<sub>2</sub> significantly inhibits grain growth, and the average grain size decreases to 3.3 μm at x = 3, which is attributed to excessive MnO<sub>2</sub> hindering grain boundary migration at grain boundaries. The dielectric properties tests indicate that ε<sub>r</sub> and tanδ can be tuned by doping with MnO<sub>2</sub>, and the sample with x = 1 exhibits excellent temperature stability. In order to further analyze the dielectric properties of the samples, the electrical modulus (M\") results showed a relaxation phenomenon, and the activation energy (E<sub>a</sub>) was calculated by Arrhenius relationship. It was found that the change in the E<sub>a</sub> value may be closely related to the OVs compensation mechanism. The existence of OVs was further confirmed by XPS analysis and its relationship with the MnO<sub>2</sub> doping content was explained. Impedance measurements indicate that doping with MnO<sub>2</sub> significantly improves the insulation performance of the material. The E<sub>a</sub> was calculated, and the reasons for its variation were discussed. This study provides an experimental reference for the optimization of dielectric properties and defect regulation of lead-free antiferroelectric ceramic materials.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"409 ","pages":"Article 116278"},"PeriodicalIF":2.4,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748818","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}
Pub Date : 2025-12-06DOI: 10.1016/j.ssc.2025.116274
Mingyang Li , Ming Gao , Shuxin Yao , Jingzhi Zhou , Ping Peng , Xianglei Dong
In this study, the solid-liquid interfacial energy and its anisotropy were quantitatively calculated in the U-Mo alloy system by using molecular dynamics simulations combined with the capillary wave method. After determining the equilibrium phase composition via Monte Carlo molecular dynamics, the interface location was identified using order parameters. The interfacial stiffness was extracted by fitting the relationship between the Fourier transform of the interface height and the wave number k, i.e., . The results show that the average interfacial energy increases with temperature (from 139.2 mJ/m2 at 1450 K to 159.7 mJ/m2 at 1600 K), and the of the U-Mo alloy is higher than that of pure U (106.2 mJ/m2). The interfacial energy satisfies the anisotropy rule < . The anisotropy parameters (0.0066–0.0085) and (0.0012–0.0019) reveal the crystal orientation sensitivity of the interfacial stiffness and the anisotropy of different crystal planes, which can provide key parameters for phase-field simulations.
{"title":"Molecular dynamics calculation of solid liquid interfacial energy and anisotropy in U-Mo alloy system","authors":"Mingyang Li , Ming Gao , Shuxin Yao , Jingzhi Zhou , Ping Peng , Xianglei Dong","doi":"10.1016/j.ssc.2025.116274","DOIUrl":"10.1016/j.ssc.2025.116274","url":null,"abstract":"<div><div>In this study, the solid-liquid interfacial energy and its anisotropy were quantitatively calculated in the U-Mo alloy system by using molecular dynamics simulations combined with the capillary wave method. After determining the equilibrium phase composition via Monte Carlo molecular dynamics, the interface location was identified using order parameters. The interfacial stiffness was extracted by fitting the relationship between the Fourier transform of the interface height and the wave number k, i.e., <span><math><mrow><msup><mrow><mo>|</mo><mrow><mi>A</mi><mrow><mo>(</mo><mi>k</mi><mo>)</mo></mrow></mrow><mo>|</mo></mrow><mn>2</mn></msup><mo>∝</mo><msup><mi>k</mi><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math></span>. The results show that the average interfacial energy <span><math><mrow><msub><mi>γ</mi><mn>0</mn></msub></mrow></math></span> increases with temperature (from 139.2 mJ/m<sup>2</sup> at 1450 K to 159.7 mJ/m<sup>2</sup> at 1600 K), and the <span><math><mrow><msub><mi>γ</mi><mn>0</mn></msub></mrow></math></span> of the U-Mo alloy is higher than that of pure U (106.2 mJ/m<sup>2</sup>). The interfacial energy satisfies the anisotropy rule <span><math><mrow><msub><mi>γ</mi><mn>110</mn></msub><mo>≈</mo><msub><mi>γ</mi><mn>111</mn></msub></mrow></math></span> < <span><math><mrow><msub><mi>γ</mi><mn>100</mn></msub></mrow></math></span>. The anisotropy parameters <span><math><mrow><msub><mi>ε</mi><mn>1</mn></msub></mrow></math></span> (0.0066–0.0085) and <span><math><mrow><msub><mi>ε</mi><mn>2</mn></msub></mrow></math></span> (0.0012–0.0019) reveal the crystal orientation sensitivity of the interfacial stiffness and the anisotropy of different crystal planes, which can provide key parameters for phase-field simulations.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"409 ","pages":"Article 116274"},"PeriodicalIF":2.4,"publicationDate":"2025-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797293","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}
Pub Date : 2025-12-05DOI: 10.1016/j.ssc.2025.116276
Mustafa Bohra, Mikhail Zubkov
We investigate the interplay of chiral anomaly and dissipation in one-dimensional Dirac semimetal. For definiteness we consider the Su–Schrieffer–Heeger (SSH) model, which on the language of lattice field theory represents 1 D Wilson fermions. We employ the non-equilibrium Keldysh Green function formalism, and calculate the chiral imbalance and electric conductivity in the presence of energy dissipation, revealing how these observables are connected to the chiral anomaly. By systematically incorporating dissipation effects into the Keldysh framework, we demonstrate how the anomaly-induced contributions manifest in both axial charge density and electric current.
{"title":"Relation between chiral anomaly and electric transport in 1D Dirac semimetal","authors":"Mustafa Bohra, Mikhail Zubkov","doi":"10.1016/j.ssc.2025.116276","DOIUrl":"10.1016/j.ssc.2025.116276","url":null,"abstract":"<div><div>We investigate the interplay of chiral anomaly and dissipation in one-dimensional Dirac semimetal. For definiteness we consider the Su–Schrieffer–Heeger (SSH) model, which on the language of lattice field theory represents 1 D Wilson fermions. We employ the non-equilibrium Keldysh Green function formalism, and calculate the chiral imbalance and electric conductivity in the presence of energy dissipation, revealing how these observables are connected to the chiral anomaly. By systematically incorporating dissipation effects into the Keldysh framework, we demonstrate how the anomaly-induced contributions manifest in both axial charge density and electric current.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"409 ","pages":"Article 116276"},"PeriodicalIF":2.4,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748817","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}
Pub Date : 2025-12-05DOI: 10.1016/j.ssc.2025.116277
Sourav Ranjan Satpathy , Rajashree Khatua , S.K. Patri , S. Bhattacharyya
Spinel ferrites have gained attention due to their remarkable properties, leading to their use in various industrial, healthcare, and technological applications. Among spinel ferrites, cobalt ferrite is the most efficient for these applications. This study involves the synthesis of cobalt ferrite CoFe2O4 (CFO) and chromium-modified cobalt ferrite CoCrFeO4 (CCFO) using the solid-state reaction method. The formation of the compounds is confirmed by X-ray diffraction, Field emission scanning electron microscopy, Fourier-transform infrared spectrometry, and Raman spectroscopy. Rietveld refinement for both samples is performed using X'Pert High Score Plus software. The samples display a cubic structure with high crystallinity. A reduction in the lattice parameter is observed with the addition of Cr. The lattice parameter for CFO is 8.394 Å, and for Cr-doped CFO, it is 8.374 Å (this decrease is due to substituting the larger Fe3+ ion with the smaller Cr3+ ion). In addition, the dielectric value decreases compared to that of pure cobalt ferrite. Additionally, the magnetization decreases with the addition of Cr, and the Law of approach to saturation is fitted to the MH loop for both samples. The saturation magnetization for CFO is 71.54 emu/g, and CCFO is 25.90 emu/g.
{"title":"Effect of Cr substitution on structural, dielectric, and magnetic properties of CoFe2O4: A comparative study","authors":"Sourav Ranjan Satpathy , Rajashree Khatua , S.K. Patri , S. Bhattacharyya","doi":"10.1016/j.ssc.2025.116277","DOIUrl":"10.1016/j.ssc.2025.116277","url":null,"abstract":"<div><div>Spinel ferrites have gained attention due to their remarkable properties, leading to their use in various industrial, healthcare, and technological applications. Among spinel ferrites, cobalt ferrite is the most efficient for these applications. This study involves the synthesis of cobalt ferrite CoFe<sub>2</sub>O<sub>4</sub> (CFO) and chromium-modified cobalt ferrite CoCrFeO<sub>4</sub> (CCFO) using the solid-state reaction method. The formation of the compounds is confirmed by X-ray diffraction, Field emission scanning electron microscopy, Fourier-transform infrared spectrometry, and Raman spectroscopy. Rietveld refinement for both samples is performed using X'Pert High Score Plus software. The samples display a cubic structure with high crystallinity. A reduction in the lattice parameter is observed with the addition of Cr. The lattice parameter for CFO is 8.394 Å, and for Cr-doped CFO, it is 8.374 Å (this decrease is due to substituting the larger Fe<sup>3+</sup> ion with the smaller Cr<sup>3+</sup> ion). In addition, the dielectric value decreases compared to that of pure cobalt ferrite. Additionally, the magnetization decreases with the addition of Cr, and the Law of approach to saturation is fitted to the MH loop for both samples. The saturation magnetization for CFO is 71.54 emu/g, and CCFO is 25.90 emu/g.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"409 ","pages":"Article 116277"},"PeriodicalIF":2.4,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837309","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}
Pub Date : 2025-12-04DOI: 10.1016/j.ssc.2025.116275
Terufumi Yokota
The mean-field 10-state Potts glass model is studied focusing attention on the formation of metastable glassy states by rapid quenching Monte Carlo simulations. Metastable glassy state can be obtained by the rapid quenching in the model with a ferromagnetic interaction , in which the ferromagnetic state is the equilibrium ordered state. For a smaller value of , the system changes from a paramagnetic state to the ferromagnetic one and makes another change to a glassy state by annealing. For an even smaller value of , the glassy state changes to another glassy state at a lower temperature.
{"title":"Glassy states by rapid quenching in a mean-field Potts glass model","authors":"Terufumi Yokota","doi":"10.1016/j.ssc.2025.116275","DOIUrl":"10.1016/j.ssc.2025.116275","url":null,"abstract":"<div><div>The mean-field 10-state Potts glass model is studied focusing attention on the formation of metastable glassy states by rapid quenching Monte Carlo simulations. Metastable glassy state can be obtained by the rapid quenching in the model with a ferromagnetic interaction <span><math><msub><mrow><mi>J</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>, in which the ferromagnetic state is the equilibrium ordered state. For a smaller value of <span><math><msub><mrow><mi>J</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>, the system changes from a paramagnetic state to the ferromagnetic one and makes another change to a glassy state by annealing. For an even smaller value of <span><math><msub><mrow><mi>J</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>, the glassy state changes to another glassy state at a lower temperature.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"409 ","pages":"Article 116275"},"PeriodicalIF":2.4,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145692264","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}
Pub Date : 2025-12-03DOI: 10.1016/j.ssc.2025.116272
Sandeep Kumar , Naveen Chandra Joshi , B.S. Rawat
Ferrites have many advanced magnetic and electronic properties and are also considered efficient electrode materials for supercapacitors and other energy storage devices. Ferrites and ferrite-based electrode materials have high specific capacitance, low synthetic cost, and easy availability. Copper ferrite (CuFe2O4) and its hybrid materials have received remarkable attention for their applications in energy storage devices. These materials have also been used in sensors, water purification, catalysis, and solar cells. In this study, we have used CuFe2O4/R-GO as electrode material for supercapacitors. Experimental results indicate that after incorporation of graphene, the specific capacitance of CuFe2O4 was found to be 746.6 F/g, and its cyclic stability was 90.8 % (under a 2-electrode system). The maximum specific capacitance of CuFe2O4/R-GO under a 2-electrode system was found to be 44.4 F/g at 2 A/g. The maximum energy and power densities of CuFe2O4/R-GO were evaluated to be 5.1 Wh/kg and 4492.8 W/kg, respectively.
铁氧体具有许多先进的磁性和电子特性，也被认为是超级电容器和其他储能装置的有效电极材料。铁氧体和铁氧体基电极材料具有比电容高、合成成本低、易于获得等优点。铜铁氧体（CuFe2O4）及其杂化材料在储能器件中的应用备受关注。这些材料也被用于传感器、水净化、催化和太阳能电池。在本研究中，我们使用CuFe2O4/R-GO作为超级电容器的电极材料。实验结果表明，加入石墨烯后，CuFe2O4的比电容为746.6 F/g，循环稳定性为90.8%（在双电极体系下）。在2电极体系下，CuFe2O4/R-GO在2 a /g时的最大比电容为44.4 F/g。CuFe2O4/R-GO的最大能量密度和功率密度分别为5.1 Wh/kg和4492.8 W/kg。
{"title":"Electrochemical study of highly efficient CuFe2O4/R-GO based electrode material","authors":"Sandeep Kumar , Naveen Chandra Joshi , B.S. Rawat","doi":"10.1016/j.ssc.2025.116272","DOIUrl":"10.1016/j.ssc.2025.116272","url":null,"abstract":"<div><div>Ferrites have many advanced magnetic and electronic properties and are also considered efficient electrode materials for supercapacitors and other energy storage devices. Ferrites and ferrite-based electrode materials have high specific capacitance, low synthetic cost, and easy availability. Copper ferrite (CuFe<sub>2</sub>O<sub>4</sub>) and its hybrid materials have received remarkable attention for their applications in energy storage devices. These materials have also been used in sensors, water purification, catalysis, and solar cells. In this study, we have used CuFe<sub>2</sub>O<sub>4</sub>/R-GO as electrode material for supercapacitors. Experimental results indicate that after incorporation of graphene, the specific capacitance of CuFe<sub>2</sub>O<sub>4</sub> was found to be 746.6 F/g, and its cyclic stability was 90.8 % (under a 2-electrode system). The maximum specific capacitance of CuFe<sub>2</sub>O<sub>4</sub>/R-GO under a 2-electrode system was found to be 44.4 F/g at 2 A/g. The maximum energy and power densities of CuFe<sub>2</sub>O<sub>4</sub>/R-GO were evaluated to be 5.1 Wh/kg and 4492.8 W/kg, respectively.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"409 ","pages":"Article 116272"},"PeriodicalIF":2.4,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748816","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}
Pub Date : 2025-11-28DOI: 10.1016/j.ssc.2025.116260
A.L. Samgin
Proton hopping in perovskite oxides is considered from an effective-mass viewpoint in the context of reported experimental studies of lattice vibrations that mediate the polaron formation. The charge carrier then appears as a Holstein-type small proton polaron, for which a certain lattice vibration oscillation then behaves as an assist phonon and promotes the proton to the adjacent oxygen host. Polaron mass behavior is investigated with a system plus reservoir model which extends our previous investigations (A.L. Samgin, Solid State Commun. 152 (2012) 585). The mass enhancement factor, which unlike the standard Larsen effective mass equation for the Holstein electron accounts explicitly for temperature dependent coupling effects, appears to be inherent to the phonon-assisted proton hopping regime. The proposed approach offers the possibility to describe certain aspects of the interaction of protons with phonons important for determining transport properties of oxides at both low- and high-temperatures.
在晶格振动介导极化子形成的实验研究中，从有效质量的角度考虑了钙钛矿氧化物中的质子跳跃。电荷载流子以荷尔斯坦型小质子极化子的形式出现，其一定的晶格振动振荡充当辅助声子，并将质子促进到邻近的氧宿主。用系统加储层模型研究极化子质量行为，该模型扩展了我们之前的研究（A.L. Samgin, Solid State common . 152(2012) 585）。质量增强因子与荷尔斯坦电子的标准拉森有效质量方程不同，它明确地说明了温度依赖的耦合效应，似乎是声子辅助质子跳跃机制所固有的。提出的方法提供了描述质子与声子相互作用的某些方面的可能性，这对于确定氧化物在低温和高温下的输运性质很重要。
{"title":"Temperature dependent proton-phonon coupling in perovskite oxides","authors":"A.L. Samgin","doi":"10.1016/j.ssc.2025.116260","DOIUrl":"10.1016/j.ssc.2025.116260","url":null,"abstract":"<div><div>Proton hopping in perovskite oxides is considered from an effective-mass viewpoint in the context of reported experimental studies of lattice vibrations that mediate the polaron formation. The charge carrier then appears as a Holstein-type small proton polaron, for which a certain lattice vibration oscillation then behaves as an assist phonon and promotes the proton to the adjacent oxygen host. Polaron mass behavior is investigated with a system plus reservoir model which extends our previous investigations (A.L. Samgin, Solid State Commun. 152 (2012) 585). The mass enhancement factor, which unlike the standard Larsen effective mass equation for the Holstein electron accounts explicitly for temperature dependent coupling effects, appears to be inherent to the phonon-assisted proton hopping regime. The proposed approach offers the possibility to describe certain aspects of the interaction of protons with phonons important for determining transport properties of oxides at both low- and high-temperatures.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"409 ","pages":"Article 116260"},"PeriodicalIF":2.4,"publicationDate":"2025-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145623188","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}
Pub Date : 2025-11-28DOI: 10.1016/j.ssc.2025.116265
A. Varaprasad , Rameeza Begum Sheik , Balakrishna Avula , Nageswara Rao Netinti , G. Chinna Ram , M. Gnana Kiran , Syed Inthiyaz , Malla Balakrishna , Anees A. Ansari
Here we reporting the structural, optical and magnetic properties changes occurred in orthoferrite of Yb1-xLaxFe1-xTixO3 (x = 0, 0.025 and 0.05) nanoparticles derived through sol-gel synthesis route, and tartaric acid used as a chelating agent. X-ray diffraction (XRD) analysis accompanied by Rietveld structure refinement established a single-phase of YbFeO3 (YbFO) orthorhombic crystal structure with Pnma space group. The X-ray photoelectron spectroscopy (XPS) studies revels that the concentration of oxygen vacancies was reduced from 24.12 to 20.32, with an increase of doping concentration from 0 to 5 mol% in YbFO matrix. The crystallite size was calculated using the Williamson-Hall (W-H) plots using XRD data and it was found to be decreasing crystallite size from 56 ± 5 nm to 36 ± 6 nm with an increase of doping and co-doping concentration from 0 to 5 mol% in YbFO matrix. An improved (∼1.5 time) magnetization value (saturation) was observed in 5 mol% doped and co-doped YbFO sample when compared to that of undoped YbFO sample, which indicates Fe3+–Fe3+ super-exchange interactions in the sample. Photocatalysis studies was also performed on these samples, and calculated rate constant for 5 mol% doped and co-doped YbFO nanomaterials was 0.0182 min−1 which is two times higher than that of pure YbFO nanomaterials (0.0089 min−1). These findings suggested that 5 mol% La doped and Ti co-doped nanomaterials could be a promising candidate for photocatalysis applications.
{"title":"Influence of La-Ti co-doping on structural, photocatalysis and magnetic performance of YbFeO3 nanoparticles derived from sol-gel method","authors":"A. Varaprasad , Rameeza Begum Sheik , Balakrishna Avula , Nageswara Rao Netinti , G. Chinna Ram , M. Gnana Kiran , Syed Inthiyaz , Malla Balakrishna , Anees A. Ansari","doi":"10.1016/j.ssc.2025.116265","DOIUrl":"10.1016/j.ssc.2025.116265","url":null,"abstract":"<div><div>Here we reporting the structural, optical and magnetic properties changes occurred in orthoferrite of Yb<sub>1-x</sub>La<sub>x</sub>Fe<sub>1-x</sub>Ti<sub>x</sub>O<sub>3</sub> (x = 0, 0.025 and 0.05) nanoparticles derived through sol-gel synthesis route, and tartaric acid used as a chelating agent. X-ray diffraction (XRD) analysis accompanied by Rietveld structure refinement established a single-phase of YbFeO<sub>3</sub> (YbFO) orthorhombic crystal structure with <em>Pnma</em> space group. The X-ray photoelectron spectroscopy (XPS) studies revels that the concentration of oxygen vacancies was reduced from 24.12 to 20.32, with an increase of doping concentration from 0 to 5 mol% in YbFO matrix. The crystallite size was calculated using the Williamson-Hall (W-H) plots using XRD data and it was found to be decreasing crystallite size from 56 ± 5 nm to 36 ± 6 nm with an increase of doping and co-doping concentration from 0 to 5 mol% in YbFO matrix. An improved (∼1.5 time) magnetization value (saturation) was observed in 5 mol% doped and co-doped YbFO sample when compared to that of undoped YbFO sample, which indicates Fe<sup>3+</sup>–Fe<sup>3+</sup> super-exchange interactions in the sample. Photocatalysis studies was also performed on these samples, and calculated rate constant for 5 mol% doped and co-doped YbFO nanomaterials was 0.0182 min<sup>−1</sup> which is two times higher than that of pure YbFO nanomaterials (0.0089 min<sup>−1</sup>). These findings suggested that 5 mol% La doped and Ti co-doped nanomaterials could be a promising candidate for photocatalysis applications.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"409 ","pages":"Article 116265"},"PeriodicalIF":2.4,"publicationDate":"2025-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145692262","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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