Pub Date : 2026-04-01Epub Date: 2026-02-08DOI: 10.1016/j.ssc.2026.116348
Kenta Hashimoto, Suguru Kitani, Hitoshi Kawaji
We have investigated the thermal transport properties of CuIr2(S1-xSex)4 (0 ≤ x ≤ 1.0). Heat capacity (CP) analysis shows that Ir dimers with short-range order remain as nanodomains within the matrix, with a fraction of approximately 20% in the intermediate composition range (0.3 ≤ x ≤ 0.7). The peak of the phonon thermal conductivity (κph) at low temperatures exhibits a minimum at x = 0.7, rather than at x = 0.5, where the effect of point defect scattering is expected to be maximum. This behavior may be attributed to the increase in the interface density between the Ir dimer nanodomains and the matrix with an increase in Se substitution. Furthermore, the phonon relaxation time (τ) at 300 K for the Se-doped samples is comparable to that for x = 0, indicating that the anomalous phonon scattering introduced in the metallic phase (MP) is suppressed by the Se substitution.
{"title":"Effect of Se substitution on thermal transport properties of spinel CuIr2(S1-xSex)4","authors":"Kenta Hashimoto, Suguru Kitani, Hitoshi Kawaji","doi":"10.1016/j.ssc.2026.116348","DOIUrl":"10.1016/j.ssc.2026.116348","url":null,"abstract":"<div><div>We have investigated the thermal transport properties of CuIr<sub>2</sub>(S<sub>1-<em>x</em></sub>Se<sub><em>x</em></sub>)<sub>4</sub> (0 ≤ <em>x</em> ≤ 1.0). Heat capacity (<em>C</em><sub><em>P</em></sub>) analysis shows that Ir dimers with short-range order remain as nanodomains within the matrix, with a fraction of approximately 20% in the intermediate composition range (0.3 ≤ <em>x</em> ≤ 0.7). The peak of the phonon thermal conductivity (<em>κ</em><sub>ph</sub>) at low temperatures exhibits a minimum at <em>x</em> = 0.7, rather than at <em>x</em> = 0.5, where the effect of point defect scattering is expected to be maximum. This behavior may be attributed to the increase in the interface density between the Ir dimer nanodomains and the matrix with an increase in Se substitution. Furthermore, the phonon relaxation time (<em>τ</em>) at 300 K for the Se-doped samples is comparable to that for <em>x</em> = 0, indicating that the anomalous phonon scattering introduced in the metallic phase (MP) is suppressed by the Se substitution.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"411 ","pages":"Article 116348"},"PeriodicalIF":2.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386674","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 : 2026-04-01Epub Date: 2026-02-23DOI: 10.1016/j.ssc.2026.116382
Nguyen Quang Hoc , Tran Minh Thi , Pham Duy Thanh , Vu Thi Huyen Trang , Hoang Le Nhung , Vu Thi Viet Chinh , Duong Tran Quang Duy , Cap Kim Hoang Bao , Nguyen Nhat Anh , Nguyen The Quan , Le Hong Viet , Dang Dinh Son
Using the statistical moment method, we derive analytical expressions for the Helmholtz free energy, the nearest-neighbor distance, structural properties and the equation of state of face-centered cubic crystals as functions of temperature and pressure. By combining the statistical moment method with the work-heat equivalence principle, the high pressure melting curve is determined from two low-pressure reference melting temperatures, the bulk modulus and its first pressure derivative at zero pressure. Numerical results for argon and neon crystals are obtained using the Morse potential with four coordination spheres. The calculated pressure dependences of volume ratio and density at 300 K show good agreement with experimental data and other theoretical studies. The predicted melting curves for argon up to 100 GPa and neon up to 350 GPa also agree well with available results.
{"title":"High-pressure melting behavior of face-centered cubic argon and neon crystals","authors":"Nguyen Quang Hoc , Tran Minh Thi , Pham Duy Thanh , Vu Thi Huyen Trang , Hoang Le Nhung , Vu Thi Viet Chinh , Duong Tran Quang Duy , Cap Kim Hoang Bao , Nguyen Nhat Anh , Nguyen The Quan , Le Hong Viet , Dang Dinh Son","doi":"10.1016/j.ssc.2026.116382","DOIUrl":"10.1016/j.ssc.2026.116382","url":null,"abstract":"<div><div>Using the statistical moment method, we derive analytical expressions for the Helmholtz free energy, the nearest-neighbor distance, structural properties and the equation of state of face-centered cubic crystals as functions of temperature and pressure. By combining the statistical moment method with the work-heat equivalence principle, the high pressure melting curve is determined from two low-pressure reference melting temperatures, the bulk modulus and its first pressure derivative at zero pressure. Numerical results for argon and neon crystals are obtained using the Morse potential with four coordination spheres. The calculated pressure dependences of volume ratio and density at 300 K show good agreement with experimental data and other theoretical studies. The predicted melting curves for argon up to 100 GPa and neon up to 350 GPa also agree well with available results.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"411 ","pages":"Article 116382"},"PeriodicalIF":2.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386712","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 : 2026-04-01Epub Date: 2026-02-10DOI: 10.1016/j.ssc.2026.116355
Qamar Abuhassan , Rima Heider Al Omari , Maher Ali Rusho , G. PadmaPriya , S. Supriya , Subhashree Ray , Renu Sharma , Saodatkhon Ibragimova , Rafiqjon Kazakov , Zukhra Atamuratova , Mounir M. Bekhit , Ehab I. Taha
This study reports the development of a novel HAP/NiWO4 nanocomposite designed for high-performance supercapacitor electrodes. HAP was synthesized via a sol - gel process, while NiWO4 was prepared using a hydrothermal method; their composite was subsequently formed, and structural analyses (XRD, FTIR, FESEM, XPS) confirmed successful composite formation with reduced crystallite size and uniform nanoparticle distribution. The presence of Ca2+, P5+, Ni2+/Ni3+, and W6+ species was verified. Electrochemical testing in a symmetric two-electrode setup revealed that the HAP/NiWO4 electrode outperformed the individual components, achieving a specific capacitance of 324.62 F g-1 and an energy density of 28.85 Wh kg-1 at 1 A g-1. The composite also showed strong cycling stability, retaining 93.51% of its capacitance after 5000 cycles, along with reduced resistances in EIS analysis. These synergistic structural and redox features make HAP/NiWO4 a promising and durable material for next-generation energy storage devices.
本研究报道了一种用于高性能超级电容器电极的新型HAP/NiWO4纳米复合材料的开发。HAP采用溶胶-凝胶法制备，NiWO4采用水热法制备；结构分析（XRD， FTIR， FESEM， XPS）证实了复合材料的成功形成，晶体尺寸减小，纳米颗粒分布均匀。证实了Ca2+、P5+、Ni2+/Ni3+和W6+的存在。在对称双电极设置下的电化学测试表明，HAP/NiWO4电极优于单个组件，在1 a g-1下实现了324.62 F -1的比电容和28.85 Wh kg-1的能量密度。该复合材料还表现出很强的循环稳定性，在5000次循环后保持了93.51%的电容，同时EIS分析中的电阻也降低了。这些协同结构和氧化还原特性使HAP/NiWO4成为下一代储能设备中有前途的耐用材料。
{"title":"Synergistic enhancement of sustainable energy storage through a novel hydroxyapatite/nickel tungstate nanocomposite electrode","authors":"Qamar Abuhassan , Rima Heider Al Omari , Maher Ali Rusho , G. PadmaPriya , S. Supriya , Subhashree Ray , Renu Sharma , Saodatkhon Ibragimova , Rafiqjon Kazakov , Zukhra Atamuratova , Mounir M. Bekhit , Ehab I. Taha","doi":"10.1016/j.ssc.2026.116355","DOIUrl":"10.1016/j.ssc.2026.116355","url":null,"abstract":"<div><div>This study reports the development of a novel HAP/NiWO<sub>4</sub> nanocomposite designed for high-performance supercapacitor electrodes. HAP was synthesized via a sol - gel process, while NiWO<sub>4</sub> was prepared using a hydrothermal method; their composite was subsequently formed, and structural analyses (XRD, FTIR, FESEM, XPS) confirmed successful composite formation with reduced crystallite size and uniform nanoparticle distribution. The presence of Ca<sup>2+</sup>, P<sup>5+</sup>, Ni<sup>2+</sup>/Ni<sup>3+</sup>, and W<sup>6+</sup> species was verified. Electrochemical testing in a symmetric two-electrode setup revealed that the HAP/NiWO<sub>4</sub> electrode outperformed the individual components, achieving a specific capacitance of 324.62 F g-1 and an energy density of 28.85 Wh kg-1 at 1 A g-1. The composite also showed strong cycling stability, retaining 93.51% of its capacitance after 5000 cycles, along with reduced resistances in EIS analysis. These synergistic structural and redox features make HAP/NiWO4 a promising and durable material for next-generation energy storage devices.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"411 ","pages":"Article 116355"},"PeriodicalIF":2.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386731","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 : 2026-04-01Epub Date: 2026-02-11DOI: 10.1016/j.ssc.2026.116358
V.М. Aliev , R.Z. Ibaeva , J.A. Ragimov , U.I. Ashurova , G.N. Mammadov , G.A. Alieva
Understanding how heavy cation substitution modifies superconducting fluctuations and pseudogap behavior remains a key challenge in cuprate high-temperature superconductors. In this work, we investigate the transport properties, fluctuation conductivity, and pseudogap characteristics of the Cd-substituted compound Y0.3Cd0.7Ba2Cu3O7−δ synthesized via the solid-state reaction method. The sample exhibits a superconducting transition at Tc ≈ 84 K, while the normal-state resistivity strongly increases due to enhanced disorder and carrier scattering, providing a unique platform to study fluctuation phenomena under conditions of suppressed metallicity.
Analysis of the excess conductivity σ′(T) within the Aslamazov–Larkin and Hikami–Larkin frameworks reveal a well-defined 3D→2D dimensional crossover at T0 = 86.7 K, enabling determination of the coherence length along the c-axis, ξc(0) = 1.74 Å. Over a wider temperature range, σ′(T) was interpreted using the local pair (LP) model, which allowed extraction of the pseudogap magnitude. The pseudogap exhibits a substantial value of Δ∗(Tc) ≈ 206 K, while its maximum reaches Δ∗(Tm) ≈ 794 K, indicating strong pairing correlations far above Tc. The temperature evolution of Δ∗(T) reflects the crossover from strongly bound bosons to fluctuation Cooper pairs, highlighting the interplay between Cd-induced lattice distortion, scattering mechanisms, and precursor superconductivity.
These results provide new insight into how heavy Cd substitution modifies the fluctuation regime and pseudogap state in YBCO-based materials. The findings enhance understanding of disorder-driven effects in cuprates and demonstrate that even strongly resistive Cd-modified compositions retain robust precursor pairing, offering opportunities for controlled tuning of superconducting properties through targeted cation engineering.
{"title":"Obtaining and studying the physical characteristics of Y0,3CD0,7BA2CU3O7-Δ high-temperature superconductor material","authors":"V.М. Aliev , R.Z. Ibaeva , J.A. Ragimov , U.I. Ashurova , G.N. Mammadov , G.A. Alieva","doi":"10.1016/j.ssc.2026.116358","DOIUrl":"10.1016/j.ssc.2026.116358","url":null,"abstract":"<div><div>Understanding how heavy cation substitution modifies superconducting fluctuations and pseudogap behavior remains a key challenge in cuprate high-temperature superconductors. In this work, we investigate the transport properties, fluctuation conductivity, and pseudogap characteristics of the Cd-substituted compound Y<sub>0</sub>.<sub>3</sub>Cd<sub>0</sub>.<sub>7</sub>Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>−δ synthesized via the solid-state reaction method. The sample exhibits a superconducting transition at T<sub>c</sub> ≈ 84 K, while the normal-state resistivity strongly increases due to enhanced disorder and carrier scattering, providing a unique platform to study fluctuation phenomena under conditions of suppressed metallicity.</div><div>Analysis of the excess conductivity σ′(T) within the Aslamazov–Larkin and Hikami–Larkin frameworks reveal a well-defined 3D→2D dimensional crossover at T<sub>0</sub> = 86.7 K, enabling determination of the coherence length along the c-axis, ξc(0) = 1.74 Å. Over a wider temperature range, σ′(T) was interpreted using the local pair (LP) model, which allowed extraction of the pseudogap magnitude. The pseudogap exhibits a substantial value of Δ∗(T<sub>c</sub>) ≈ 206 K, while its maximum reaches Δ∗(Tm) ≈ 794 K, indicating strong pairing correlations far above T<sub>c</sub>. The temperature evolution of Δ∗(T) reflects the crossover from strongly bound bosons to fluctuation Cooper pairs, highlighting the interplay between Cd-induced lattice distortion, scattering mechanisms, and precursor superconductivity.</div><div>These results provide new insight into how heavy Cd substitution modifies the fluctuation regime and pseudogap state in YBCO-based materials. The findings enhance understanding of disorder-driven effects in cuprates and demonstrate that even strongly resistive Cd-modified compositions retain robust precursor pairing, offering opportunities for controlled tuning of superconducting properties through targeted cation engineering.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"411 ","pages":"Article 116358"},"PeriodicalIF":2.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146161761","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}
In this study, the compression behavior of samples of NdN, HoN and ErN at room temperature and high pressure was studied using synchrotron radiation X-ray diffraction in a diamond anvil cell. All the three materials did not undergo structural phase transition under high pressure. By fitting the volume data under high pressure, the bulk modulus of NdN, HoN and ErN were obtained to be 146(7) GPa, 149(3) GPa, and 159(5) GPa, respectively. In addition, we have studied the equation of state and band structures of NdN, HoN and ErN using density functional theory. The bulk modulus of NdN, HoN and ErN derived from this method are 145 GPa, 175 GPa, and 181 GPa, respectively. Importantly, we observed that NdN, HoN and ErN demonstrate semiconductor properties throughout the entire high pressure range without significant changes.
{"title":"Effect of pressure on lanthanide nitrides of NdN, HoN and ErN","authors":"Lun Xiong , Jiabo Hao , Lin Xia , Jinxia Zhu , Yingchun Ding","doi":"10.1016/j.ssc.2026.116375","DOIUrl":"10.1016/j.ssc.2026.116375","url":null,"abstract":"<div><div>In this study, the compression behavior of samples of NdN, HoN and ErN at room temperature and high pressure was studied using synchrotron radiation X-ray diffraction in a diamond anvil cell. All the three materials did not undergo structural phase transition under high pressure. By fitting the volume data under high pressure, the bulk modulus of NdN, HoN and ErN were obtained to be 146(7) GPa, 149(3) GPa, and 159(5) GPa, respectively. In addition, we have studied the equation of state and band structures of NdN, HoN and ErN using density functional theory. The bulk modulus of NdN, HoN and ErN derived from this method are 145 GPa, 175 GPa, and 181 GPa, respectively. Importantly, we observed that NdN, HoN and ErN demonstrate semiconductor properties throughout the entire high pressure range without significant changes.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"411 ","pages":"Article 116375"},"PeriodicalIF":2.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386672","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 : 2026-04-01Epub Date: 2026-02-16DOI: 10.1016/j.ssc.2026.116369
Rituparna Deo , Maya Devi , Debidatta Behera
Copper oxide is a suitable material for varied applications, starting from photovoltaics to gas sensing due to its wide spectral range. The phase and the stability of the nanoparticles largely influence the optical properties. In this study, copper oxide nanoparticles are prepared by cost effective precipitation method using easily available copper chloride dihydrate precursor. The prepared samples are calcined at 100 °C and 500 °C. The structural, morphological and optical properties with reference to the dispersion parameters of the prepared samples are studied by X-ray diffraction, Field emission scanning electron microscopy and UV-Vis spectroscopy. The structural evolution of the seed-like particles from the flake-like structure with increased calcination temperature confirms the stable monoclinic phase of the prepared samples. Also, a theoretical modelling-based approach using density functional theory (DFT) was carried out to gain deeper insight into the structural, thermal and mechanical properties. The values of the optical bandgap of all the prepared nanoparticles (NPs) are found to be in the visible range. With an increase in calcination temperature, the band gap value is reduced both for direct and indirect transitions. Refractive indices of the samples are obtained from Kramers–Kroing relation. The refractive index value is found to increase with calcination. The dispersion in refractive indices is analysed by using the Wemple-Di-Domenico (WDD) model fitting. The variations in dielectric constant, zero frequency refractive index, oscillation and dispersion energies with calcination temperature are studied. The effective optical carrier density of the nanomaterials is calculated, which shows a high value of 9.3 × 1022 cm−3. From the calculated screened plasma frequency, it is found that the transmittance of the material over the entire UV and Visible spectrum range is very low. So, this material is very suitable for application in the absorber layer of solar cells.
{"title":"Structural and optical properties of CuO: A comprehensive experimental and first-principles DFT Investigation","authors":"Rituparna Deo , Maya Devi , Debidatta Behera","doi":"10.1016/j.ssc.2026.116369","DOIUrl":"10.1016/j.ssc.2026.116369","url":null,"abstract":"<div><div>Copper oxide is a suitable material for varied applications, starting from photovoltaics to gas sensing due to its wide spectral range. The phase and the stability of the nanoparticles largely influence the optical properties. In this study, copper oxide nanoparticles are prepared by cost effective precipitation method using easily available copper chloride dihydrate precursor. The prepared samples are calcined at 100 °C and 500 °C. The structural, morphological and optical properties with reference to the dispersion parameters of the prepared samples are studied by X-ray diffraction, Field emission scanning electron microscopy and UV-Vis spectroscopy. The structural evolution of the seed-like particles from the flake-like structure with increased calcination temperature confirms the stable monoclinic phase of the prepared samples. Also, a theoretical modelling-based approach using density functional theory (DFT) was carried out to gain deeper insight into the structural, thermal and mechanical properties. The values of the optical bandgap of all the prepared nanoparticles (NPs) are found to be in the visible range. With an increase in calcination temperature, the band gap value is reduced both for direct and indirect transitions. Refractive indices of the samples are obtained from Kramers–Kroing relation. The refractive index value is found to increase with calcination. The dispersion in refractive indices is analysed by using the Wemple-Di-Domenico (WDD) model fitting. The variations in dielectric constant, zero frequency refractive index, oscillation and dispersion energies with calcination temperature are studied. The effective optical carrier density of the nanomaterials is calculated, which shows a high value of 9.3 × 10<sup>22</sup> cm<sup>−3</sup>. From the calculated screened plasma frequency, it is found that the transmittance of the material over the entire UV and Visible spectrum range is very low. So, this material is very suitable for application in the absorber layer of solar cells.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"411 ","pages":"Article 116369"},"PeriodicalIF":2.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386716","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 : 2026-04-01Epub Date: 2026-02-12DOI: 10.1016/j.ssc.2026.116357
Asgar Huseynov , Samira Mammadova , Eldar Zeynalov , Minira Agahuseynova , Dunya Babanlı , Narmin Mustafayeva
This research focuses on the synthesis and characterization of gigantic carbon micro-tubes (CMTs) via a simple, low-cost, low-pressure (10–15 kPa) CVD method. The design, construction of the CVD setup, and the development of the synthesis technique and methodology were realized by our research group. Gigantic CMTs were synthesized using gas (propane) and liquid (acetonitrile, ethanol, and toluene) carbon sources. The synthesized materials were thoroughly analyzed using SEM, EDX, Raman spectroscopy, and X-ray diffraction. SEM analysis revealed that the diameters of CMTs exceed the literature results to date, reaching 34.48 μm. Carbon structures synthesized from propane gas, ethanol, and toluene were assigned to the CT structure; meanwhile, from acetonitrile, carbon fibers (d = 9-44,4) μm; (l = 700-800) μm were synthesized. The obtained results proved that the carbon source type directly impacts the diameter (ethanol (9-20) μm; toluene (3,57-7,36) μm), and length (ethanol (l = 500-600) μm; toluene (l = 80- 90) μm; propane gas (l = 500-600) μm of the CMTs. Raman spectroscopy showed low disorder in the structure of CMTs compared to CFs. The grown CMTs have a great potential for microelectronic devices, composite materials, environmental protection, etc.
{"title":"Fabrication of gigantic diameter carbon micro-tubes by low-cost Chemical Vapor Deposition (CVD) method at low pressures and characterization","authors":"Asgar Huseynov , Samira Mammadova , Eldar Zeynalov , Minira Agahuseynova , Dunya Babanlı , Narmin Mustafayeva","doi":"10.1016/j.ssc.2026.116357","DOIUrl":"10.1016/j.ssc.2026.116357","url":null,"abstract":"<div><div>This research focuses on the synthesis and characterization of gigantic carbon micro-tubes (CMTs) via a simple, low-cost, low-pressure (10–15 kPa) CVD method. The design, construction of the CVD setup, and the development of the synthesis technique and methodology were realized by our research group. Gigantic CMTs were synthesized using gas (propane) and liquid (acetonitrile, ethanol, and toluene) carbon sources. The synthesized materials were thoroughly analyzed using SEM, EDX, Raman spectroscopy, and X-ray diffraction. SEM analysis revealed that the diameters of CMTs exceed the literature results to date, reaching 34.48 μm. Carbon structures synthesized from propane gas, ethanol, and toluene were assigned to the CT structure; meanwhile, from acetonitrile, carbon fibers (d = 9-44,4) μm; (l = 700-800) μm were synthesized. The obtained results proved that the carbon source type directly impacts the diameter (ethanol (9-20) μm; toluene (3,57-7,36) μm), and length (ethanol (l = 500-600) μm; toluene (l = 80- 90) μm; propane gas (l = 500-600) μm of the CMTs. Raman spectroscopy showed low disorder in the structure of CMTs compared to CFs. The grown CMTs have a great potential for microelectronic devices, composite materials, environmental protection, etc.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"411 ","pages":"Article 116357"},"PeriodicalIF":2.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386730","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 : 2026-03-01Epub Date: 2026-02-11DOI: 10.1016/j.ssc.2026.116346
Elangovan Jayaseelan , Peter Daniel Nixon , Magdalin Asir Gnanraj , Kalivel Parameswari , Nallamuthu Ananthi
In this work, KIT-6, silver molybdate (Ag6Mo10O33) and composite Ag6Mo10O33 @ KIT-6 were synthesized by hydrothermal method with the help terephthalic acid as acid modulator. The synthesized materials were confirmed by SEM, EDX, XRD, UV-DRS and BET analysis. The materials were utilized as photo catalysts in in the photocatalytic dye degradation of methylene blue (MB) effectively. The better photo catalytic activity of Ag6Mo10O33 @ KIT-6 composite was due to the increased active sites, desired pore size, higher surface area, and superior light-harvesting activity. The band gap of Ag6Mo10O33 @ KIT-6 photocatalyst was reduced from 3.13 eV to 2.95 eV, which was suitable for visible light activity. The efficiency of photo degradation of MB dye by Ag6Mo10O33 @ KIT-6 was 97.89 % which is higher than commercial Ag6Mo10O33 (58.86 %). The influence of KIT-6 mesoporous material on the photo degradation efficiency of silver molybdate was discussed in terms of surface area, pore size, quantum confinement effects, surface defects, plasmonic effect and band gap. The scavenger test was carried out to reveal the better photo catalytic activity of the composite and it was found to be due to the key reactive species like .O2− and .OH radicals and the corresponding possible charge transfer mechanism was also discussed. And the SPR effect of Ag in Ag6Mo10O33 @ KIT-6 was found to be the reason for the excellent photo catalytic efficiency. Recyclability studies were carried out to investigate the reuse of the photocatalyst Ag6Mo10O33 @ KIT-6 composite. The photocatalyst Ag6Mo10O33 @ KIT-6 has been found to possess good recycling stability even after the 4th cycle of photo degradation with the efficiency of 78 %.
{"title":"Ag6Mo10O33 @ KIT-6 composite with tailored band gap and enhanced surface area for efficient photocatalytic degradation of methylene blue under visible light","authors":"Elangovan Jayaseelan , Peter Daniel Nixon , Magdalin Asir Gnanraj , Kalivel Parameswari , Nallamuthu Ananthi","doi":"10.1016/j.ssc.2026.116346","DOIUrl":"10.1016/j.ssc.2026.116346","url":null,"abstract":"<div><div>In this work, KIT-6, silver molybdate (Ag<sub>6</sub>Mo<sub>10</sub>O<sub>33</sub>) and composite Ag<sub>6</sub>Mo<sub>10</sub>O<sub>33</sub> @ KIT-6 were synthesized by hydrothermal method with the help terephthalic acid as acid modulator. The synthesized materials were confirmed by SEM, EDX, XRD, UV-DRS and BET analysis. The materials were utilized as photo catalysts in in the photocatalytic dye degradation of methylene blue (MB) effectively. The better photo catalytic activity of Ag<sub>6</sub>Mo<sub>10</sub>O<sub>33</sub> @ KIT-6 composite was due to the increased active sites, desired pore size, higher surface area, and superior light-harvesting activity. The band gap of Ag<sub>6</sub>Mo<sub>10</sub>O<sub>33</sub> @ KIT-6 photocatalyst was reduced from 3.13 eV to 2.95 eV, which was suitable for visible light activity. The efficiency of photo degradation of MB dye by Ag<sub>6</sub>Mo<sub>10</sub>O<sub>33</sub> @ KIT-6 was 97.89 % which is higher than commercial Ag<sub>6</sub>Mo<sub>10</sub>O<sub>33</sub> (58.86 %). The influence of KIT-6 mesoporous material on the photo degradation efficiency of silver molybdate was discussed in terms of surface area, pore size, quantum confinement effects, surface defects, plasmonic effect and band gap. The scavenger test was carried out to reveal the better photo catalytic activity of the composite and it was found to be due to the key reactive species like <sup>.</sup>O<sub>2</sub><sup>−</sup> and <sup>.</sup>OH radicals and the corresponding possible charge transfer mechanism was also discussed. And the SPR effect of Ag in Ag<sub>6</sub>Mo<sub>10</sub>O<sub>33</sub> @ KIT-6 was found to be the reason for the excellent photo catalytic efficiency. Recyclability studies were carried out to investigate the reuse of the photocatalyst Ag<sub>6</sub>Mo<sub>10</sub>O<sub>33</sub> @ KIT-6 composite. The photocatalyst Ag<sub>6</sub>Mo<sub>10</sub>O<sub>33</sub> @ KIT-6 has been found to possess good recycling stability even after the 4th cycle of photo degradation with the efficiency of 78 %.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"410 ","pages":"Article 116346"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186351","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 : 2026-03-01Epub Date: 2026-02-04DOI: 10.1016/j.ssc.2026.116338
Yuelong Zhang , Jingcheng Yu , Na Liu , Shuai Tong , Hong Chang
The volatile Ru3+(/Ru4+) doping introduces the valence unbalance in SrFe12-2xCuxRuxO19. As a result, some dangling bonds appear, and the symmetry around Fe3+ decreases. In the UV-vis spectra, a transition is observed with the energy bandwidth of 0.64 eV. Due to the coexistence of Fe3+ (HS) and Fe3+ (IS), two magnetic resonance peaks exist in the compounds, and they effectively deepened and broadened the microwave absorption. The x = 0.6 sample has the minimum RL as low as −59 dB, which is equal to 99.9999% microwave being absorbed. It is due to the combined effect of the relatively high attenuation factor, good impedance matching, and the quarter wavelength criterion. In the x = 0.4 sample, at a single layer thickness of 2.2 mm, the effective microwave absorption () has a very broad bandwidth of 9.07 GHz. Below 4 mm, the x = 1.0 sample has a broad multi layer absorption bandwidth of 13.02 GHz. It fully covers the C-, X- and Ku-bands. All these properties make SrFe12-2xCuxRuxO19 a very promising microwave absorbing material.
{"title":"Strong microwave absorption and plausible Fe3+ spin states in SrFe12-2xCuxRuxO19","authors":"Yuelong Zhang , Jingcheng Yu , Na Liu , Shuai Tong , Hong Chang","doi":"10.1016/j.ssc.2026.116338","DOIUrl":"10.1016/j.ssc.2026.116338","url":null,"abstract":"<div><div>The volatile Ru<sup>3+</sup>(/Ru<sup>4+</sup>) doping introduces the valence unbalance in SrFe<sub>12-2<em>x</em></sub>Cu<sub><em>x</em></sub>Ru<sub><em>x</em></sub>O<sub>19</sub>. As a result, some dangling bonds appear, and the symmetry around Fe<sup>3+</sup> decreases. In the UV-vis spectra, a transition is observed with the energy bandwidth of 0.64 eV. Due to the coexistence of Fe<sup>3+</sup> (HS) and Fe<sup>3+</sup> (IS), two magnetic resonance peaks exist in the compounds, and they effectively deepened and broadened the microwave absorption. The <em>x</em> = 0.6 sample has the minimum <em>RL</em> as low as −59 dB, which is equal to 99.9999% microwave being absorbed. It is due to the combined effect of the relatively high attenuation factor, good impedance matching, and the quarter wavelength criterion. In the <em>x</em> = 0.4 sample, at a single layer thickness of 2.2 mm, the effective microwave absorption (<span><math><mrow><mi>R</mi><mi>L</mi><mo>≤</mo><mo>−</mo><mn>10</mn><mtext>dB</mtext></mrow></math></span>) has a very broad bandwidth of 9.07 GHz. Below 4 mm, the <em>x</em> = 1.0 sample has a broad multi layer absorption bandwidth of 13.02 GHz. It fully covers the C-, X- and Ku-bands. All these properties make SrFe<sub>12-2<em>x</em></sub>Cu<sub><em>x</em></sub>Ru<sub><em>x</em></sub>O<sub>19</sub> a very promising microwave absorbing material.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"410 ","pages":"Article 116338"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186388","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}
This work presents a first-principles investigation of the structural, electronic, and optical properties of sulfur-doped ZnO1-xSx alloys using density functional theory. Starting from wurtzite ZnO, we systematically substituted oxygen with sulfur over the full composition range, generating relaxed structures that exhibit gradual lattice expansion consistent with the larger ionic radius of S2−. The electronic band gap displays a clear non-monotonic evolution as a function of sulfur content. The optical properties are systematically analyzed across the entire sulfur composition range (0 ≤ x ≤ 1), providing a comprehensive picture of composition-dependent dielectric response and light absorption in ZnO1-xSx alloys. Simulation results show that sulfur incorporation dramatically enhances the dielectric response and optical absorption in the visible range, with the strongest enhancement occurring at intermediate S concentrations (around 37.5–50%). At higher S contents, the absorption edge shifts back toward the ultraviolet, following the widening of the band gap. Together, these results highlight sulfur substitution as an effective strategy for engineering the band structure and optical response of ZnO, enabling the design of ZnO1-xSx alloys with tunable properties for optoelectronic, photovoltaic, and photocatalytic applications.
{"title":"Tuning the electronic and optical properties of ZnO through sulfur doping: A DFT study","authors":"G.B. Eshonqulov , D.G. Berdiyorova , D.K. Shodieva , M.U. Niyozaliev , G.R. Berdiyorov","doi":"10.1016/j.ssc.2026.116341","DOIUrl":"10.1016/j.ssc.2026.116341","url":null,"abstract":"<div><div>This work presents a first-principles investigation of the structural, electronic, and optical properties of sulfur-doped ZnO<sub>1-x</sub>S<sub>x</sub> alloys using density functional theory. Starting from wurtzite ZnO, we systematically substituted oxygen with sulfur over the full composition range, generating relaxed structures that exhibit gradual lattice expansion consistent with the larger ionic radius of S<sup>2−</sup>. The electronic band gap displays a clear non-monotonic evolution as a function of sulfur content. The optical properties are systematically analyzed across the entire sulfur composition range (0 ≤ x ≤ 1), providing a comprehensive picture of composition-dependent dielectric response and light absorption in ZnO<sub>1-x</sub>S<sub>x</sub> alloys. Simulation results show that sulfur incorporation dramatically enhances the dielectric response and optical absorption in the visible range, with the strongest enhancement occurring at intermediate S concentrations (around 37.5–50%). At higher S contents, the absorption edge shifts back toward the ultraviolet, following the widening of the band gap. Together, these results highlight sulfur substitution as an effective strategy for engineering the band structure and optical response of ZnO, enabling the design of ZnO<sub>1-x</sub>S<sub>x</sub> alloys with tunable properties for optoelectronic, photovoltaic, and photocatalytic applications.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"410 ","pages":"Article 116341"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186348","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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