Ceramics International最新文献_第3页

Microwave absorption properties of one-step formed CNTs/Fe3O4-carbonyl iron superflexible buckypaper by directional pressure filtration 通过定向压力过滤一步成型的 CNT/Fe3O4-羰基铁超柔性降压纸的微波吸收特性

IF 5.1 2区材料科学

Ceramics International Pub Date : 2024-10-05 DOI: 10.1016/j.ceramint.2024.10.025

Yanzhi Cai , Haiming Yu , Laifei Cheng , Yibing Yuan , Siyu Guo , Zhongyi Hu , Yuhan Wang , Dengpeng Chen , Jianing Liu , Hudie Yuan

{"title":"Microwave absorption properties of one-step formed CNTs/Fe3O4-carbonyl iron superflexible buckypaper by directional pressure filtration","authors":"Yanzhi Cai , Haiming Yu , Laifei Cheng , Yibing Yuan , Siyu Guo , Zhongyi Hu , Yuhan Wang , Dengpeng Chen , Jianing Liu , Hudie Yuan","doi":"10.1016/j.ceramint.2024.10.025","DOIUrl":"10.1016/j.ceramint.2024.10.025","url":null,"abstract":"<div><div>In order to realize the integration of structure and function of microwave-absorbing materials, carbon nanotubes/magnetic nanoparticle buckypaper (CNT/MNP BP) self-supporting, ultra-flexible, ultra-thin and ultra-light composites were prepared by composing CNTs with MNPs through directional pressure filtration technology. The BP composite, with a bulk density of 0.62 g/cm3 and a thickness of 0.21 mm, can be uninterruptedly tightly wound around a 4 mm diameter glass rod many times without structural damage. The microwave-absorbing properties and magnetic properties of the CNT/MNP composites with different compositions and contents were systematically analyzed. The CNT-Fe3O4 Buckypaper with 33.3 wt% Fe3O4 content (CF33.3 %) has the best electromagnetic wave absorption capability, with a minimum reflection loss value of −52.01 dB and an effective absorption bandwidth of 4.08 GHz. The VSM test shows that the saturation magnetization strength of CF33.3 % is 38.4 emu/g. The excellent electromagnetic wave absorption performance is attributed to the polarization and conduction losses of CNTs, natural resonance, exchange resonance and eddy current losses of MNPs, and multiple scattering and reflection within the porous network structure of the composites. The CNTs and MNPs has good dispersion in the buckypaper, where CNTs construct a superflexible skeleton besides an excellent conductive network. The self-supporting superflexible CNT/MNP BP composites have a good application prospect in the field of wearable electronic devices in the future.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 51128-51138"},"PeriodicalIF":5.1,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improvement of energy storage properties of BNT-based ceramics via compositional modification 通过成分改性提高 BNT 基陶瓷的储能性能

IF 5.1 2区材料科学

Ceramics International Pub Date : 2024-10-04 DOI: 10.1016/j.ceramint.2024.09.361

Yangxi Yan , Jiejie Hui , Xiaoying Wang , Dongyan Zhang , Maolin Zhang , Mo Zhao , Meng Wan , Li Jin , Zhimin Li

{"title":"Improvement of energy storage properties of BNT-based ceramics via compositional modification","authors":"Yangxi Yan , Jiejie Hui , Xiaoying Wang , Dongyan Zhang , Maolin Zhang , Mo Zhao , Meng Wan , Li Jin , Zhimin Li","doi":"10.1016/j.ceramint.2024.09.361","DOIUrl":"10.1016/j.ceramint.2024.09.361","url":null,"abstract":"<div><div>Lead-free ceramic capacitors are extensively utilized in pulsed power systems for their environmentally friendly characteristics, high power density, and fast charging/discharging rate. However, it remains highly challenging to achieve concurrent improvements in both recoverable energy storage density (Wrec) and efficiency (η). In this study, Ta2O5 with a wide bandgap (∼4 eV) was chosen in complex with Mg2+ ions to form Ba(Mg1/3Ta2/3)O3 as the second phase of a BNT-based solid solution. Combined with phase modulation, a compositional disorder of equipotential sites is formed in chalcogenide crystals, which in turn induces charge disorder generating localized random fields. We have designed and prepared a set of binary (1-x)Bi0.5Na0.5TiO3-xBa(Mg1/3Ta2/3)O3 (BNT-xBMT) ceramics using a conventional solid-phase method. An ultra-high breakdown field strength (Eb) value (245 kV/cm) was attained in 0.80BNT-0.20BMT ceramic, resulting in desirable values of Wrec (3.99 J/cm3) and η (92.0 %). These results offer a new strategy for designing high entropy ceramic materials of high performance in the future.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 48918-48930"},"PeriodicalIF":5.1,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photodynamic antibacterial activity of CoTiO3/ZnIn2S4 Z-type heterojunction and its efficient enhancement mechanism by reactive oxygen species CoTiO3/ZnIn2S4 Z 型异质结的光动力抗菌活性及其受活性氧影响的高效增强机制

IF 5.1 2区材料科学

Ceramics International Pub Date : 2024-10-04 DOI: 10.1016/j.ceramint.2024.10.005

Meiru Lv , Yanan Song , Huan Li , Kangfu Wang , Xiaoning Tang , Qian Sun , Lin Tian

{"title":"Photodynamic antibacterial activity of CoTiO3/ZnIn2S4 Z-type heterojunction and its efficient enhancement mechanism by reactive oxygen species","authors":"Meiru Lv , Yanan Song , Huan Li , Kangfu Wang , Xiaoning Tang , Qian Sun , Lin Tian","doi":"10.1016/j.ceramint.2024.10.005","DOIUrl":"10.1016/j.ceramint.2024.10.005","url":null,"abstract":"<div><div>The Solar-powered photocatalytic antibacterial technology has received widespread attention as a safe and efficient environmental self-cleaning technology, but its application remains a challenging task. Taking inspiration from the design of heterojunction structures in photocatalytic materials, this study employed a precipitation in-situ synthesis method to successfully construct a CoTiO3/ZnIn2S4 (CTZIS) Z-scheme heterojunction with excellent photocatalytic performance by depositing layered ZnIn2S4 nanosheets in situ on a rod-shaped CoTiO3 support. After visible-light irradiation for 20 min, the CTZIS antimicrobial agent (100 μg/mL) exhibited an ultra-high bacterial inactivation rate of 99.9 %, which was 10 and 11 times higher than that of ZnIn2S4 and CoTiO3 under the same conditions, using E. coli as the study object. Meanwhile, bacteria treated with CTZIS exhibited the highest degree of cell membrane lipid peroxidation and the lowest activity of intracellular respiratory chain dehydrogenase, demonstrating excellent antibacterial performance. After testing and calculation, it was found that the excellent antibacterial activity comes from the solid gap electric field between heterojunctions, which enhances the effective spatial separation of photo-generated carriers and effectively increases the quantum yield of reactive oxygen species (ROS). The synergistic antibacterial mechanism of CTZIS from bacterial surface to bacterial interior co-damage was revealed, in which the production of • <math><mrow><msubsup><mi>O</mi><mn>2</mn><mo>‐</mo></msubsup></mrow></math> and •OH are a key active substance in the process of bacterial oxidative stress inactivation.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50934-50947"},"PeriodicalIF":5.1,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Double perovskite CaSrMSbO6(M = La, Gd, Y): Bi3+ phosphors for multifunctional application 双包晶 CaSrMSbO6（M = La、Gd、Y）：用于多功能应用的 Bi3+ 荧光粉

IF 5.1 2区材料科学

Ceramics International Pub Date : 2024-10-04 DOI: 10.1016/j.ceramint.2024.10.026

Bin Li, Chong Yang, Rongbo Ma, Bin Cao, Chaoyong Deng, Weichao Huang

{"title":"Double perovskite CaSrMSbO6(M = La, Gd, Y): Bi3+ phosphors for multifunctional application","authors":"Bin Li, Chong Yang, Rongbo Ma, Bin Cao, Chaoyong Deng, Weichao Huang","doi":"10.1016/j.ceramint.2024.10.026","DOIUrl":"10.1016/j.ceramint.2024.10.026","url":null,"abstract":"<div><div>Bi3+-doping luminescent materials have recently evoked considerable interest in versatile applications. In this work, we have developed a series of Bi3+-activated CaSrMSbO6(M = La, Gd, Y) phosphors with double perovskite structures, exhibiting blue emission from 350 nm to 500 nm. The emission spectral position and intensity of Bi3+ ions can be tuned by changing excitation wavelength and doping concentrations. The relationship between the local crystal field environment and the luminescence properties is comprehensively analyzed. Importantly, optical temperature properties of CaSrLaSbO6: Bi3+ were investigated and were found to reach a maximum relative sensitivity of 4.57 % K−1 at 298 K. Furthermore, the anti-counterfeiting ink was prepared using CaSrLaSbO6: Bi3+ phosphors, and it showed tunable emission under different light stimulation. These results indicate that CaSrLaSbO6: Bi3+ phosphors have application potential in optical temperature sensing and anti-counterfeiting.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 51139-51151"},"PeriodicalIF":5.1,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and formation mechanism of (W) WC/Fe bundle reinforced iron matrix composites (W) WC/Fe 束增强铁基复合材料的制备和形成机理

IF 5.1 2区材料科学

Ceramics International Pub Date : 2024-10-04 DOI: 10.1016/j.ceramint.2024.10.027

Congcong Ren , Nana Zhao , Li Ma , Rui Shan , Yunhua Xu , Zhen Cui , Lisheng Zhong

{"title":"Preparation and formation mechanism of (W) WC/Fe bundle reinforced iron matrix composites","authors":"Congcong Ren , Nana Zhao , Li Ma , Rui Shan , Yunhua Xu , Zhen Cui , Lisheng Zhong","doi":"10.1016/j.ceramint.2024.10.027","DOIUrl":"10.1016/j.ceramint.2024.10.027","url":null,"abstract":"<div><div>To address the issue of strength and toughness inversion in traditional metal matrix composites, which are reinforced by uniformly distributed ceramic particles, this research developed a novel space bundle configuration of reinforced iron matrix composite using tungsten wire (W) and tungsten carbide (WC). This composite was prepared using a lost foam casting process combined with in-situ reaction. Microstructural analysis revealed that WC particles are distributed along the tungsten wire, with larger particles at the center and smaller ones at the edges. The formation of the reinforcement occurs in two stages: first, a solid-liquid reaction between the solid tungsten wire and molten iron during the lost foam casting process, promoting WC formation at high temperatures and carbon potential; second, an in situ solid-solid reaction where Fe diffuses and Fe3W3C decomposes, forming a composite structure of WC and α-Fe. The composite obtained at 1100 °C for 9 h exhibited a compressive strength of 836.59 MPa and a fracture strain of 18.69 %, representing increases of 48.46 % and 48.69 % respectively compared to gray cast iron (GCI). The (W) WC/Fe bundle reinforcement effectively enhances the strength and toughness of the composite through the high volume fraction and gradient distribution of WC particles, combined with the synergistic effect of α-Fe. This research provides a new strategy for improving the mechanical properties of composite materials and resolving the issue of strength-toughness inversion.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 51152-51161"},"PeriodicalIF":5.1,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of manufacturing parameters on bioactive glass 45S5: Structural analysis and applications in bone tissue engineering 制造参数对生物活性玻璃 45S5：结构分析及在骨组织工程中的应用的影响

IF 5.1 2区材料科学

Ceramics International Pub Date : 2024-10-04 DOI: 10.1016/j.ceramint.2024.10.014

K.W. Santos , K.J.S.G. Costa , I.S. Gonçalves , M. Alves , D.P. Lauda , L.M.R. Vasconcellos , T.M.B. Campos , I.R. Oliveira

{"title":"Influence of manufacturing parameters on bioactive glass 45S5: Structural analysis and applications in bone tissue engineering","authors":"K.W. Santos , K.J.S.G. Costa , I.S. Gonçalves , M. Alves , D.P. Lauda , L.M.R. Vasconcellos , T.M.B. Campos , I.R. Oliveira","doi":"10.1016/j.ceramint.2024.10.014","DOIUrl":"10.1016/j.ceramint.2024.10.014","url":null,"abstract":"<div><div>Bioactive glass (BG-45S5) production through the melting process is affected by a wide variety of parameters. This study investigated the synthesis of BG-45S5 granules and the process variables to produce a bioactive and osteoinductive BG for bone grafting applications. The melting process was initially analyzed by varying parameters such as crucible type and pouring environment using P2O5 as phosphorus precursor. The obtained products were characterized by crystalline phases, characteristic chemical groups, particle size distribution, and chemical composition. Materials poured into graphite or steel molds resulted in particle sizes more suitable for applications in granular form. Using a platinum crucible yielded a chemical composition closer to the target when compared with another ceramic crucible. Subsequently, the melting process was evaluated to different phosphorus precursor (P2O5 or Na2HPO4) and melting duration (1 or 2 h) in a platinum crucible verifying their effects on the thermal behavior, chemical composition and structure of BG-45S5. Employing Na2HPO4 as a precursor led to higher glass transition and crystallization temperatures as compared to P2O5, enhancing glass homogeneity and structural stability. The product with better characteristics in terms of composition and structure was further characterized for bioactivity and cell culture behavior, showing a greater amount of mineralization nodules when compared to commercial hydroxyapatite. This is particularly due to its behavior as the solubility and interaction in biological environments.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 51043-51054"},"PeriodicalIF":5.1,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fabrication of silicon carbide color center nanoparticles by femtosecond laser ablation in liquid 在液体中通过飞秒激光烧蚀制造碳化硅彩色中心纳米粒子

IF 5.1 2区材料科学

Ceramics International Pub Date : 2024-10-04 DOI: 10.1016/j.ceramint.2024.10.021

Jianshi Wang, Bing Dong, Ying Song, Mengzhi Yan, Qingqing Sun, Zongwei Xu

{"title":"Fabrication of silicon carbide color center nanoparticles by femtosecond laser ablation in liquid","authors":"Jianshi Wang, Bing Dong, Ying Song, Mengzhi Yan, Qingqing Sun, Zongwei Xu","doi":"10.1016/j.ceramint.2024.10.021","DOIUrl":"10.1016/j.ceramint.2024.10.021","url":null,"abstract":"<div><div>Combined with the fabrication of low-dimensional materials, certain silicon carbide color centers can become excellent platforms for nano-optics, and be applied to quantum and biomedical fields. In this work, color center nanoparticles were prepared based on high purity semi-insulating silicon carbide substrate using liquid-assisted femtosecond laser machining. Effects of multi-pulse array ablation and line scanning fabrication were investigated, and parameters such as repetition frequency and pulse number were also optimized. We employed photoluminescence spectroscopy, field emission scanning electron microscopy and transient fluorescence spectroscopy to characterize optical properties and micromorphology of nanoparticles. The broadband photoluminescence within the range of 850–950 nm should be attributed to silicon vacancy color centers, and V1/V1’ zero-phonon lines were confirmed at low temperature. It is noted that the femtosecond laser annealing is critical for the luminescence enhancement of color center nanoparticles. The evolution of particles and cavitation bubbles during processing was elucidated. After optimization, silicon vacancy color center nanoparticles were prepared by multi-pulse (107) array ablation and 200 kHz pulse repetition frequency, with an average diameter of approximately 15 nm and an average density reaching 273.94 counts/μm2. The sample can be preserved stably in the form of nanoparticle solutions. Processing methods and corresponding conclusions of this study would be applicable to the femtosecond laser fabrication and micromorphology control of color center nanoparticles of various hard-brittle semiconductors.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 51098-51110"},"PeriodicalIF":5.1,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of high purity Ti2AlC MAX phase by combustion method through thermal explosion mode: Optimization of process parameters & evaluation of microstructure 用燃烧法通过热爆模式合成高纯度 Ti2AlC MAX 相：工艺参数优化与微观结构评估

IF 5.1 2区材料科学

Ceramics International Pub Date : 2024-10-04 DOI: 10.1016/j.ceramint.2024.09.431

Amir Edrisi , Hossein Aghajani , Seyed Hossein Seyedein , Arvin Taghizadeh Tabrizi

{"title":"Synthesis of high purity Ti2AlC MAX phase by combustion method through thermal explosion mode: Optimization of process parameters & evaluation of microstructure","authors":"Amir Edrisi , Hossein Aghajani , Seyed Hossein Seyedein , Arvin Taghizadeh Tabrizi","doi":"10.1016/j.ceramint.2024.09.431","DOIUrl":"10.1016/j.ceramint.2024.09.431","url":null,"abstract":"<div><div>Obtaining high-purity MAX-phase powders is a challenging issue. Therefore, in this article, the effects of two key parameters, including mechanical activation time (1, 2, and 3 h), and preheating temperature (800 and 1000 °C) were investigated on the formation mechanism of Ti2AlC MAX phase using mechanically activated (assisted) self-propagating high-temperature synthesis (MA-SHS) combustion method through thermal explosion mode. For this aim, a powder mixture of titanium, aluminum, and carbon with a stoichiometry ratio of (2:1:1) was used. Differential thermal analysis (DTA) was carried out to evaluate the effect of mechanical activation and preheating temperature of the formation temperature of the target MAX phase. Subsequently, the microstructural, phase analysis, chemical composition, and determination of surface chemical states studies were carried out through scanning electron microscopy (SEM), X-ray energy distribution spectroscopy (EDS) transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), and X-ray photoelectric spectroscopy (XPS), respectively. DTA results illustrated that applying mechanical activation alters the formation temperature, which leads to an increase in the purity of the MAX phase. The quantitative measurements were carried out using the Rietveld method to determine the purity of the achieved MAX phase. The results indicated that samples subjected to 2 h of mechanical activation at a preheat temperature of 1000 °C exhibited to contain 96.1 % of Ti2AlC MAX phase, which is the highest value among other specimens and the lowest amount of secondary and oxide phases (3.9 % of TiC) during the combustion synthesis process compared to other samples.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50846-50854"},"PeriodicalIF":5.1,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structural and optical studies of annealed zirconia nanocrystals: Phase transformations, defect dynamics, and magnetic behaviour 退火氧化锆纳米晶体的结构和光学研究：相变、缺陷动力学和磁性行为

IF 5.1 2区材料科学

Ceramics International Pub Date : 2024-10-03 DOI: 10.1016/j.ceramint.2024.09.412

Maneshwar Thakur , Ankush Vij , Akshay Kumar , Bon Heun Koo , Fouran Singh , Vir Singh Rangra

{"title":"Structural and optical studies of annealed zirconia nanocrystals: Phase transformations, defect dynamics, and magnetic behaviour","authors":"Maneshwar Thakur , Ankush Vij , Akshay Kumar , Bon Heun Koo , Fouran Singh , Vir Singh Rangra","doi":"10.1016/j.ceramint.2024.09.412","DOIUrl":"10.1016/j.ceramint.2024.09.412","url":null,"abstract":"<div><div>The present study is a continuation of our previous work, where we synthesized and characterized t-ZrO2 nanocrystals through the combustion method. Further, t-ZrO2 nanocrystals are annealed at 600, 900, 1200, and 1400°C and characterized through XRD, Raman, FESEM, XPS, photoluminescence (PL), and thermoluminescence (TL) techniques. XRD and Raman patterns reveal that the as-synthesized ZrO2 nanocrystals exhibit a tetragonal phase, and annealing at different temperatures induces phase transformations. Annealing at 600 °C restores the metastable nature of the tetragonal phase, although monoclinic nucleation is visualized through Raman spectroscopy. Annealing at higher temperatures leads to a complete transformation into the monoclinic phase. FESEM micrographs reveal extensive crystal growth and consolidation upon annealing. XPS analysis shows a reduction in the binding energies of the Zr 3d doublet due to the removal of lattice oxygen and the formation of oxygen vacancies upon annealing. The annealing of the synthesized material at 1400 °C induced a transformation to ferromagnetic behaviour at 300 K, with increased saturation magnetization (Ms) and coercivity (Hc), reflecting the stabilization of magnetic ordering and residual defects in the grain boundary. PL responses confirm the formation of luminescent defects in the crystal lattice. The TL response varies with the crystalline phase, annealing temperature, and radiation dose, suggesting defect creation, migration, and localization in the lattice. Overall, the study provides valuable insights into the structural and optical properties of ZrO2 nanoparticles annealed at different temperatures.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50680-50689"},"PeriodicalIF":5.1,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structure distortion enhanced electrical performances of Na0.25K0.25Bi2.5Nb2O9-based high-temperature piezoceramics 结构畸变增强 Na0.25K0.25Bi2.5Nb2O9 基高温压电陶瓷的电气性能

IF 5.1 2区材料科学

Ceramics International Pub Date : 2024-10-03 DOI: 10.1016/j.ceramint.2024.10.022

Mengxue Zhang, Xinchun Xie, Aiwen Xie, Yi Zhang, Liqiang Liu, Xin Gao, Ruzhong Zuo

{"title":"Structure distortion enhanced electrical performances of Na0.25K0.25Bi2.5Nb2O9-based high-temperature piezoceramics","authors":"Mengxue Zhang, Xinchun Xie, Aiwen Xie, Yi Zhang, Liqiang Liu, Xin Gao, Ruzhong Zuo","doi":"10.1016/j.ceramint.2024.10.022","DOIUrl":"10.1016/j.ceramint.2024.10.022","url":null,"abstract":"<div><div>Na0.25K0.25Bi2.5Nb2O9-based piezoelectric ceramics are potential candidates for high-temperature applications where improving piezoelectric properties is an urgent issue. In this work, significantly improved piezoelectric properties and thermal stability of Na0.25K0.25Bi2.5-xCexNb2-yWyO9 (abbreviated NKB2.5-xCxN2-yWy, x = 0.03, y = 0.01, y = 0.03, y = 0.05) ceramics were obtained through Ce and W co-doping and using a traditional solid-state technique. The optimal composition of NaKBi2.47Ce0.03Nb1.99W0.01O9 exhibits a large piezoelectric coefficient d33 of 23.1 pC/N, maintains a high Curie temperature Tc of 690 °C, and a low tanδ of 0.006. The increase of d33 may be attributed to the structure distortion, the micro-sized domains, and the high-density domain walls. More importantly, its d33 value maintains 86 % of the initial value after being annealed at 650 °C for 2 h, whereas only 65 % for the undoped sample under the same conditions, indicating an obviously improved thermal stability. This work provides a new idea for improving piezoelectric properties and thermal stability of Na0.25K0.25Bi2.5Nb2O9-based piezoelectric ceramics.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 51111-51118"},"PeriodicalIF":5.1,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0