Bidyut B. Saikia, Nabajyoti Saikia, Jyoti Prasad Gogoi, P. K. Mochahari
{"title":"Synthesis and development of Fe3O4-expanded graphite embedded cement nanocomposites as excellent X-band microwave absorber","authors":"Bidyut B. Saikia, Nabajyoti Saikia, Jyoti Prasad Gogoi, P. K. Mochahari","doi":"10.1007/s10854-025-14757-4","DOIUrl":"10.1007/s10854-025-14757-4","url":null,"abstract":"<div><p>In the present work, novel Fe<sub>3</sub>O<sub>4</sub>-expanded graphite-white cement composites of different wt.% ratios (5%, 10%, 20%, 30% and 40%) were prepared as viable microwave absorbers in the frequency range (8.2–12.4) GHz. Initially, the synthesized Fe<sub>3</sub>O<sub>4</sub> and expanded graphite (EG) were characterized by XRD and SEM studies confirming mean particle size of Fe<sub>3</sub>O<sub>4</sub> ~ 26.41 nm and loose and spongy structure of EG flakes providing elevated surface area. Microwave absorption’s constitutive parameters viz. complex permittivity (<span>({varepsilon }_{r})</span>) and permeability (<span>({mu }_{r})</span>) measured using Nicolson Ross method showed increasing trend with higher Fe<sub>3</sub>O<sub>4</sub> -EG wt.%. Based on transmission line theory, optimized single-layer absorber designs were fabricated for microwave absorption evaluation. The reflection loss (<i>RL</i><sub>m</sub>) was measured to be approximately − 25 dB at 10.8 GHz and − 36 dB at 11.8 GHz for composites with 5 wt.% and 20 wt.% loading, respectively. Further, geometrically modified perforated structure of triangular lattice pattern in the composites was proposed for broad absorption bandwidth.</p></div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Otávio C. Silva Neto, João G. de Oliveira Neto, Hellen B. L. Silva, Adenilson O. dos Santos, Francisco F. de Sousa, Virna S. Paiva, Clenilton C. dos Santos, Franciana Pedrochi, Alysson Steimacher
{"title":"The influence of Ho2O3 content on structural, spectroscopic, thermal, and dielectric properties of CaBTe glasses","authors":"Otávio C. Silva Neto, João G. de Oliveira Neto, Hellen B. L. Silva, Adenilson O. dos Santos, Francisco F. de Sousa, Virna S. Paiva, Clenilton C. dos Santos, Franciana Pedrochi, Alysson Steimacher","doi":"10.1007/s10854-025-14837-5","DOIUrl":"10.1007/s10854-025-14837-5","url":null,"abstract":"<div><p>A series of holmium-doped borotellurite glasses with the chemical formula 54B<sub>2</sub>O<sub>3</sub>–10TeO<sub>2</sub>–26CaO–(10-x)CaF<sub>2</sub>-xHo<sub>2</sub>O<sub>3</sub> (CaBTe), where x = concentration of 0.00, 0.10, 0.25, 0.50, 0.75, and 1.00 mol% was prepared using the conventional melt-quenching method. Techniques such as X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, and impedance spectroscopy were employed to investigate the structural and dielectric properties of the synthesized glasses. It was observed that both the density and molar volume values increased with the rising dopant concentration. Ultraviolet–Visible spectroscopy analysis revealed characteristic bands of Ho<sup>3+</sup> ions, showing that the absorption coefficient increased with Ho<sub>2</sub>O<sub>3</sub> concentration. The refractive index, molar electronic polarizability, optical band gap, and Urbach energy were also calculated and discussed. The results indicated that the refractive index increased with the rise in Ho<sub>2</sub>O<sub>3</sub> concentration, ranging from 1.60 (CaBTe) to 1.67 (CaBTe:Ho<sub>1.00</sub>). Conversely, the optical band gap energy decreased from 3.27 eV (CaBTe) to 2.78 eV (CaBTe:Ho<sub>1.00</sub>) for direct allowed transitions and from 3.90 eV (CaBTe) to 3.81 eV (CaBTe:Ho<sub>1.00</sub>) for indirect allowed transitions of Ho<sup>3+</sup> ions. Additionally, the electronic polarizability exhibited an exponential increase with Ho<sub>2</sub>O<sub>3</sub> content, rising from 3.50 (matrix) to 3.86 (CaBTe:Ho<sub>1.00</sub>). The Urbach energy values suggested that the incorporation of Ho<sub>2</sub>O<sub>3</sub> species introduces greater disorder into the glass network, increasing from 0.30 eV (CaBTe) to 0.45 eV (CaBTe:Ho<sub>1.00</sub>). Excitation and emission spectra identified excitation bands at 451 nm, corresponding to the <sup>5</sup>I<sub>8</sub> → <sup>5</sup>G<sub>6</sub> transition, which produced red emission at 623 nm (<sup>5</sup>F<sub>5</sub> → <sup>5</sup>I<sub>8</sub>). Thermoanalytical analysis demonstrated that Ho<sub>2</sub>O<sub>3</sub> increases the crystallization temperature of the glasses from 742 °C (0.00% Ho<sub>2</sub>O<sub>3</sub>) to 760 °C (1.00% Ho<sub>2</sub>O<sub>3</sub>). These findings highlight the novelty of the work: the CaBTe:Ho glasses exhibit unique spectroscopic properties, making them promising candidates for low-cost, efficient red-emitting optical devices. This study provides new insights into the structural, optical, dielectric, and thermal properties of holmium-doped borotellurite glasses, emphasizing their potential for practical applications in photonic.</p></div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Microstructural, optical, and magnetic properties of La0.3A0.3Sr0.4MnO3 (A = Gd, Tb, Dy, Ho, Er) perovskites","authors":"Ahmad Gholizadeh, Mohsen Choupani","doi":"10.1007/s10854-025-14806-y","DOIUrl":"10.1007/s10854-025-14806-y","url":null,"abstract":"<div><p>Structural, optical, and magnetic properties of La<sub>0.6</sub>Sr<sub>0.4</sub>MnO<sub>3</sub> and La<sub>0.3</sub>A<sub>0.3</sub>Sr<sub>0.4</sub>MnO<sub>3</sub> (A = Gd, Tb, Dy, Ho, Er) perovskite nanoparticles synthesized using the sol–gel citrate–nitrate method were investigated. The XRD analysis of La<sub>0.3</sub>A<sub>0.3</sub>Sr<sub>0.4</sub>MnO<sub>3</sub> nanoparticles revealed a structural phase transition from rhombohedral to monoclinic with decreasing ionic radius of the rare earth substitution atoms. Crystallite size, calculated using the Scherrer method, decreased with smaller rare earth ionic radii, highlighting the impact of electronegativity on crystallite size. Raman spectroscopy highlighted structural disorder induced by rare earth doping, while field-emission scanning electron microscopy and EDX confirmed particle size reduction and homogeneous substitution. UV–Vis analysis demonstrated that the rare earth substitution reduces the bandgap of La<sub>0.6</sub>Sr<sub>0.4</sub>MnO<sub>3</sub> due to lattice distortions. This ability to control and modify the bandgap energy of these materials presents opportunities for designing tailored materials with desired electronic properties for various optoelectronic applications, such as photovoltaics and sensors. Magnetic studies revealed that saturation magnetization and coercivity decreased with substitution, driven by reduced Mn–O–Mn bond angles and increased magnetic dead layer. Smaller A-site ionic radii and particle size contributed to a weaker Mn<sup>3+</sup>–Mn<sup>4+</sup> double exchange, leading to reduced magnetization.</p></div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Tailoring the structural, optoelectrical, and optical properties of the Al-doped ZnSnO3 thin films","authors":"I. M. El Radaf, H. Y. S. Al-Zahrani","doi":"10.1007/s10854-025-14841-9","DOIUrl":"10.1007/s10854-025-14841-9","url":null,"abstract":"<div><p>In the current research, undoped and Al-doped ZnSnO<sub>3</sub> thin films are fabricated by cost-effective spray pyrolysis at various Al ratios. The XRD measurements reveal a rhombohedral structure for the ZnSnO<sub>3</sub> and Al-doped ZnSnO<sub>3</sub> thin films. The reflectance, <i>R,</i> and transmittance, <i>T</i> measurements of the ZnSnO<sub>3</sub> and Al-doped ZnSnO<sub>3</sub> thin films were employed to evaluate the linear optical parameters like refractive index, energy gap, and absorption coefficient. The increase in Al content improves the refractive index values and reduces the energy gap from 3.46 to 2.93 eV. The nonlinear absorption coefficient and nonlinear refractive index of the ZnSnO<sub>3</sub> and Al-doped ZnSnO<sub>3</sub> thin films were improved by raising the Al content from 2.5 to 7.5 wt%. The optoelectrical measurements show a significant increase in carrier concentration and electrical conductivity with increasing Al content, while optical analysis demonstrates a maintained or improved transparency in the visible range. These results suggest that the Al-doped ZnSnO<sub>3</sub> films offer high conductivity and excellent optical transparency, which are crucial for transparent conductive oxide (TCO) applications. On the other hand, the rise in Al content reduces the sheet resistance of the examined ZnSnO<sub>3</sub> and Al-doped ZnSnO<sub>3</sub> thin films. The figure of merit of the ZnSnO<sub>3</sub> and Al-doped ZnSnO<sub>3</sub> thin films was increased by raising the Al content from 2.5 to 7.5 wt%. The optimized Al doping concentration for achieving the best balance between conductivity and transparency is discussed, and the potential of Al-doped ZTO as a competitive TCO material for next-generation photovoltaic and electronic devices is highlighted.</p></div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Preparation and optical/electrical properties of vanadium pentoxide films on fluorine-doped SnO2 (FTO) substrates through sol–gel route","authors":"Bao-jia Li, Fan Wang, Yu Shi, Hui-min Zhang, Jia-jun Ruan, Li-jing Huang","doi":"10.1007/s10854-025-14802-2","DOIUrl":"10.1007/s10854-025-14802-2","url":null,"abstract":"<div><p>V<sub>2</sub>O<sub>5</sub> films were formed via sol–gel spin coating and thermal annealing with fluorine-doped SnO<sub>2</sub> (FTO) glass as substrates. The impacts of annealing temperature, time and spin-coating number on surface morphology, structure and optical/electrical properties of V<sub>2</sub>O<sub>5</sub>/FTO composite films were mainly studied. The results demonstrated that increasing annealing temperature, time and spin-coating number could contribute to increases in the film compactness, grain size and crystallinity, but too high temperatures or too long times would degrade the film compactness, and too large spin-coating numbers would cause grain/particle agglomeration and cracking phenomena. The film transmittance and sheet resistance depended on the combined effect of these factors. It was determined that a uniform and compact V<sub>2</sub>O<sub>5</sub> film could be formed on the FTO substrate under spin-coating four times and annealing at 400 °C for 60 min. The as-obtained composite film exhibited ideal optical/electrical properties, with an average transmittance (600–1100 nm) of 73.83%, a sheet resistance of 25.42 kΩ/sq, an optical band gap energy of 2.751 eV and an average transmittance (1250–1600 nm) change amplitude of 14.2% before and after phase transition that accompanied by a reversible thermotropic color change from yellow to orange. This work offers useful insights for preparing V<sub>2</sub>O<sub>5</sub>-based composite films.</p></div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Sustainable synthesis and functionalization of ZnO photocatalysts using Amphipterygium adstringens (Cuachalalate) bark extract for the effective degradation of emerging pollutants","authors":"A. Moreno Meza, A. R. Vilchis-Nestor, P. A. Luque","doi":"10.1007/s10854-025-14696-0","DOIUrl":"10.1007/s10854-025-14696-0","url":null,"abstract":"<div><p>This study investigates the photocatalytic degradation of emerging pollutants (EP) using zinc oxide nanoparticles (ZnO NPs) synthesized via green chemistry. It employs <i>Amphipterygium adstringens</i> (Cuachalalate) bark extract as a natural reducing and stabilizing agent. The photocatalytic performance of the synthesized ZnO NPs was evaluated under ultraviolet (UV) light irradiation using various model compounds, including the dyes Congo Red (CR), Malachite Green (MG), Rhodamine B (RhB), Methylene Blue (MB), and Methyl Orange (MO), as well as the pharmaceutical contaminants Ibuprofen (IBU), Ciprofloxacin (CIP), and Diclofenac sodium (DCF). Characterization techniques determine the physical, chemical, and electronic properties of ZnO NPs. Ultraviolet–visible (UV–Vis) spectroscopy presents an absorbance peak at 371 nm, and the TAUC plots of each spectrum revealed band gaps of 2.948, 2.940, and 2.847 eV for 1%-ZnO NPs, 2%-ZnO NPs, and 4%-ZnO NPs, respectively. At the same time, the obtention vibration bonds through FTIR spectroscopy showed Zn–O stretching vibration at 380 cm⁻<sup>1</sup>. X-ray diffraction (XRD) shows the crystalline structure, with average crystallite sizes of 21.6 nm, 14.19 nm, and 13.26 nm for 1%-ZnO NPs, 2%-ZnO NPs, and 4%-ZnO NPs, respectively. Finally, scanning electronic microscopy showed the morphology, which was spherical with a slight agglomeration of the particles. The photocatalytic degradation efficiency of the ZnO NPs was approximately 90% for dyes and 85% for drug contaminants. The degradation constant was determined using the equation of first-order kinetics. These promising results highlight the potential of Cuachalalate-derived ZnO NPs for efficiently remedying emerging pollutants and suggest further environmental application research, pollutants and suggest for further research in environmental applications.</p></div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10854-025-14696-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hidayath Mirza, Abdoh Jabbari, Muhammad Shahid Rashid, Ali Asghar, Shahzad Ahmed, Haneef Khan, Nishat Sultana, Syed Kashif Ali, Mohd Imran
{"title":"Design and development of Co-MOF as an efficient electrochemical platform for H2O2 sensing","authors":"Hidayath Mirza, Abdoh Jabbari, Muhammad Shahid Rashid, Ali Asghar, Shahzad Ahmed, Haneef Khan, Nishat Sultana, Syed Kashif Ali, Mohd Imran","doi":"10.1007/s10854-025-14812-0","DOIUrl":"10.1007/s10854-025-14812-0","url":null,"abstract":"<div><p>Hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) detection is crucial in biological, environmental, and industrial contexts, serving as a biomarker for oxidative stress, an enzymatic reaction product, and a common oxidizing agent. Metal–organic frameworks (MOFs) have emerged as promising candidates for electrochemical sensors due to their unique structural properties and tunable characteristics. This study reports the synthesis and characterization of a cobalt metal–organic framework (Co-MOF) as an electrochemical platform for H<sub>2</sub>O<sub>2</sub> detection. The Co-MOF was synthesized via a two-step procedure: formation of the organic ligand (H<sub>2</sub>L) followed by coordination with cobalt centers. Electrochemical characterization revealed excellent electron transfer properties with a surface-controlled process (b = 0.992) and diffusion-controlled kinetics. The sensor exhibited a high sensitivity of 91.75 μA/μM/cm<sup>2</sup> towards H<sub>2</sub>O<sub>2</sub>, with a linear response range of 2–1000 μM and a detection limit of 0.25 μM (S/N = 3). The enhanced sensing performance can be attributed to synergistic mechanisms: rapid electron transfer via Co centers, facilitated mass transport through the porous structure, and efficient catalytic decomposition of H<sub>2</sub>O<sub>2</sub>. Electrochemical impedance spectroscopy indicated a low charge transfer resistance (~ 200 Ω), suggesting favorable interfacial properties. This study establishes a foundation for developing high-performance MOF-based electrochemical sensors for H<sub>2</sub>O<sub>2</sub> detection in biological and environmental applications, with potential utility in clinical diagnostics, environmental monitoring, and industrial process control.</p></div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Fabrication of the SnO2 nanorods-Si micropillars tree-like structure for gas sensor application","authors":"Jing Liu, Futing Yi, Tianchong Zhang, Bo Wang","doi":"10.1007/s10854-025-14800-4","DOIUrl":"10.1007/s10854-025-14800-4","url":null,"abstract":"<div><p>It is the first time that the SnO<sub>2</sub> nanorods are fabricated on Si micropillars surface to form tree-like structures by the hydrothermal method successfully. And this structure is used to the gas sensor application. During the fabrication process, numerous micropillars are prepared on the Si wafer to overcome the SnO<sub>2</sub> nanorods falling off. The SnO<sub>2</sub> nanorods are prepared on the countless Si micropillars surface via a hydrothermal reaction. The Si micropillars, serving as substrates, can improve the adhesion between the SnO<sub>2</sub> nanorods and Si surface, which is a crucial step in successfully growing SnO<sub>2</sub> nanorods on the Si surface. In this study, the main conditions for synthesizing SnO<sub>2</sub> nanorods are optimized, including the concentration of the raw material, reaction time, reaction temperature, and the morphology of the Si micropillar substrate, and the growth principle of the SnO<sub>2</sub> nanorods are researched. Energy dispersive spectroscopy patterns and X-ray diffraction curves indicate that the SnO<sub>2</sub> nanorods on the Si micropillars exhibit high purity and good crystallinity. The Si wafer with this SnO<sub>2</sub> nanorods-Si micropillar tree-like structures is used for gas sensor application, and the results of the gas sensitivity test show a stable gas sensitivity performance for both alcohol and acetone.</p></div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Energy storage properties and enhanced breakdown strength of calcium-doped barium zirconate titanate thin films prepared by the sol–gel method","authors":"Xing Zhang, Chen Zhang, Haoliang Li, Zhipeng Ma, Jingwang Lu, Ke Zhang","doi":"10.1007/s10854-025-14810-2","DOIUrl":"10.1007/s10854-025-14810-2","url":null,"abstract":"<div><p>Calcium (Ca<sup>2+</sup>)-doped BZT thin films, Ba<sub>1-x</sub>Ca<sub>x</sub> Zr<sub>0.2</sub>Ti<sub>0.8</sub>O<sub>3</sub> (<i>x</i> = 0, 0.05, 0.1, 0.15 and 0.2), were synthesized on the Pt/Ti/SiO<sub>2</sub>/Si substrates via sol–gel spin-coating techniques for pulse capacitor applications. The microstructures, ferroelectric properties and energy storage performance of Ba<sub>1-x</sub>Ca<sub>x</sub>Zr<sub>0.2</sub>Ti<sub>0.8</sub>O<sub>3</sub> thin films were characterized while adjusting the Ca<sup>2+</sup> concentration. It is found that the Ca<sup>2+</sup>-doped BZT thin films exhibit single-phase perovskite structure. On increasing the Ca<sup>2+</sup> concentration, the cell volume and tolerance factor declined due to the replacement of Ca<sup>2+</sup> ions for the A-site ions in the BZT lattice. The average grain size and root-mean-square (RMS) roughness of Ba<sub>1-x</sub>Ca<sub>x</sub> Zr<sub>0.2</sub>Ti<sub>0.8</sub>O<sub>3</sub> thin films with dense and uniform microstructure is refined to 44 nm and 1.55nm, respectively, with Ca<sup>2+</sup> increasing up to <i>x</i> = 0.15. While lowering the leakage current density after Ca<sup>2+</sup> modification, the breakdown field strength of Ca<sup>2+</sup>-doped BZT thin films is improved significantly approaching 4210 kV/cm at <i>x</i> = 0.15. Because of the enlarged polarization difference (<i>P</i><sub>m</sub>–<i>P</i><sub>r</sub>), the nano grain Ba<sub>0.85</sub>Ca<sub>0.15</sub> Zr<sub>0.2</sub>Ti<sub>0.8</sub>O<sub>3</sub> thin film possesses an elevated energy storage density of 33.1 J/cm<sup>3</sup> and an acceptable energy storage efficiency of 62.1% at the ultrahigh breakdown field. The Ca-doped BZT films also have remarkable cycle reliability showing a significant potential for capacitor applications. </p></div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}