Journal of the American Ceramic Society最新文献

{"title":"Strong hybrid cellular/lamellar ceramic/polymer composites via emulsification freeze casting","authors":"Guanjin Li,&nbsp;Yushu Li,&nbsp;Likai Yang,&nbsp;Lingyi Hong,&nbsp;Xinyu Dong,&nbsp;Vincent Beng Chye Tan,&nbsp;Wei Zhai","doi":"10.1111/jace.20164","DOIUrl":"https://doi.org/10.1111/jace.20164","url":null,"abstract":"<p>Despite their unremarkable constituents, natural materials, with their hybrid hierarchical structure, possess exceptional mechanical properties. The hybrid hierarchical structure typically comprises two or more distinct phases such as lamellar, gradient, tubular, and cellular form. An oil-in-water emulsion freeze casting method is devised to create composite materials with a bio-inspired hybrid cellular/lamellar structure. The impact of two types of binders on the microstructure, namely, polyvinyl alcohol and F127, and their correlation with the mechanical properties of the composites were investigated. Samples fabricated with a 5 wt.% F127 emulsification slurry exhibited an “H”-shaped cellular/lamellar structure and achieved compressive strength and specific energy absorption of about 360 MPa and 37 kJ/kg, which are noteworthy considering their ceramic and epoxy composition. Finite element analyses were then conducted to reveal how mechanical load distribution between the different phases of the composites and the influence of microstructure on fracture paths can lead to enhancement in mechanical properties.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced electric breakdown strength and excellent storing density in BaTiO3-based ceramic in viscous polymer processing","authors":"Xing Zhao,&nbsp;Minghui He,&nbsp;Xinyu Zeng,&nbsp;Qin Li,&nbsp;Guanghua Wu,&nbsp;Fukang Chen,&nbsp;Shaofei Zhang,&nbsp;Jinfeng Sun,&nbsp;Alexander N. Vtyurin,&nbsp;Yan Yan,&nbsp;Haibo Zhang,&nbsp;Gang Liu","doi":"10.1111/jace.20155","DOIUrl":"https://doi.org/10.1111/jace.20155","url":null,"abstract":"<p>Despite being the key component in modern electronic devices or power systems, ceramic dielectric capacitors have drawbacks like low energy storage density and efficiency that limit their extensively wide application. This work adopted a different route to improve energy storage performance compared with the frequently utilized composition modification. 0.98Ba_0.65Sr_0.245Bi_0.07TiO₃-0.02Ce Pb-free ceramics with different polyvinyl alcohol (PVA) contents were prepared through viscous polymer processing. The rheological and energy-storing performance were systematically studied. It can be seen that high PVA content results in more pores and larger grain sizes that will deteriorate the breakdown strength of ceramics. The highest breakdown strength reached 420 kV/cm while the concentration of PVA was 5 wt%. The mechanism of grain sizes on breakdown strength is studied by electrical tree simulation based on COMSOL. Viscous polymer processing with proper PVA content is very effective in generating dense and homogenous structures. Finally, the ceramic with 5 wt% PVA possesses a high density of up to 4.41 J/cm³ and an efficiency of about 84.21% at 420 kV/cm. Simultaneously, this ceramic improved stability of both temperature (30–150°C) and frequency (1–300 Hz) at 350 kV/cm, while the <i>η</i> kept above 90% and <i>W</i>_rec exceeding 3.6 J/cm³.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of BaO on viscosity and structure of B2O3–SiO2–Al2O3–Na2O–BaO glass lubricant","authors":"Lei Cui,&nbsp;Pei-yuan Ni,&nbsp;Wei Lv,&nbsp;Ying Li","doi":"10.1111/jace.20181","DOIUrl":"https://doi.org/10.1111/jace.20181","url":null,"abstract":"<p>Glass lubricant with a suitable viscosity is critical for the efficient production of high-quality titanium alloy in hot extrusion process. In this study, a new glass lubricant, (30.93-0.309<i>x</i>)B₂O₃-(48.45-0.485<i>x</i>)SiO₂-(7.22-0.072<i>x</i>)Al₂O₃-(13.4-0.134<i>x</i>)Na₂O-<i>x</i>BaO (BSANB), was proposed for titanium alloy hot extrusion. The effect of BaO content varying from 0 wt.% to 15 wt.% on its viscosity was investigated, and the mechanism of viscosity change was clarified through melt structure analysis by using molecular dynamics (MD) simulation, X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The glass viscosity was measured in the temperature range of 950°C to 1100°C, and the atomic self-diffusion coefficient of the glass melt was calculated. The results demonstrated that the BaO content has a significant influence on the viscosity of the BSANB glass at the hot extrusion temperature range. The viscosity value at 950°C was decreased by 52.87%, from 103.5 Pa·s to 48.8 Pa·s, when BaO content was increased from 0 wt.% to 15 wt.%. MD simulation results of the BSANB glass show that the self-diffusion coefficient of Si atoms was lower than that of Al and B atoms, indicating that Si-O bonds were more stable in the melt. The diffusion coefficient of Si atom was directly related to the rheological behavior of the melt, which can be reflected by the melt viscosity. The results of MD simulation, XPS and Raman spectral fitting at 950°C showed an increase in the amounts of Q¹, Q⁰ and [BO₄], while the amounts of Q², Q³, Q⁴ and [AlO₄] were decreased when BaO content was increased from 0 wt.% to 15 wt.%. This demonstrated that the melt network was depolymerized with an increased BaO content, which determined the melt viscosity change. In addition, the mechanism responsible for glass viscosity reduction due to temperature increase was also discussed.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase equilibria in the ZrO2–YO1.5–NbO2.5 system at 1300°C and high-temperature experiments in the ZrO2–YNbO4 subsystem","authors":"Xiwen Tan,&nbsp;Chuanqi Liu,&nbsp;Peide Luo,&nbsp;Dan Zhao,&nbsp;Fan Zhang","doi":"10.1111/jace.20175","DOIUrl":"https://doi.org/10.1111/jace.20175","url":null,"abstract":"<p>Phase equilibria in the ZrO₂–YO_1.5–NbO_2.5 system were experimentally studied at 1300°C, and a comparison with the existing ZrO₂–YO_1.5–TaO_2.5 (ZYTO) was conducted. Ternary fluorite phases on the Y:Nb &gt; 1 side extend from binary ZrO₂-YO_1.5 to YO_1.5–NbO_2.5 system, generating a continuous solid solution region. Furthermore, it was observed that three phases of M-YNbO₄, fluorite, and m-ZrO₂ were in equilibrium. On the Y:Nb <i>&lt;</i> 1 side, two three-phase equilibrium regions were measured, namely M-YNbO₄+m-ZrO₂+O-Nb₂Zr₆O₁₇ and h-Nb₂O₅+O-Nb₂Zr₆O₁₇+M-YNbO₄. The tetragonal YNbO₄ and ZrO₂ phases both extend nearly along with Y:Nb = 1. The t-ZrO₂ phases with slightly lower stabilizer content were found to transform into their monoclinic polymorph during the cooling process. However, in the ZrO₂–YNbO₄ subsystem, the tetragonal ZrO₂ was nontransformable due to larger YO_1.5 and NbO_2.5 co-dopants, and the maximum solubility is about 18.1 mol%. Upon cooling, the tetragonal YNbO₄ phase, even with the maximum ZrO₂ content, is transformable to monoclinic form. The maximum solubility of ZrO₂ in YNbO₄ is determined to be about 20.7 mol%. Finally, the high-temperature liquidus in the ZrO₂–YNbO₄ system was first determined based on the cooling traces, and a vertical section diagram was proposed for further speculation. A eutectic reaction of Liquid→YNbO₄+ZrO₂ was discovered, and the eutectic composition and temperature were measured as 39.2ZrO₂–29.2YO_1.5–31.6NbO_2.5 and 1813°C. This study provides the basis for thermodynamic assessment of ZrO₂–YO_1.5–NbO_2.5 and is valuable for the design and development of the ZrO₂–YO_1.5–NbO_2.5-based ceramic materials.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of process parameters on deposition behavior and mechanical properties of alumina coatings by aerosol deposition","authors":"Bingying Xie,&nbsp;Rana Hassan-Naji,&nbsp;David A. Hall","doi":"10.1111/jace.20169","DOIUrl":"https://doi.org/10.1111/jace.20169","url":null,"abstract":"<p>As a novel coating spray technique, the aerosol deposition method is applied for the fabrication of dense, nanostructured ceramic coatings at room temperature via an impact consolidation mechanism. It is widely recognized that the successful deposition of coatings is strongly dependent on processing parameters during the deposition process. In this study, a brush-type aerosol generator was employed to enhance the continuity and stability of the aerosol supply. The uniformity of powder consumption at different packing densities was evaluated; an optimal loading density of 33% was identified for the alumina powders used in this study. Both simulation and experimental studies were performed to investigate the influence of gas flow rate and standoff distance (SoD) on coating fabrication and properties. The predicted particle impact velocity increased with increasing gas flow intensity and SoD, resulting in enhanced mechanical properties of the coatings, including adhesive strength and hardness. The maximum compressive residual stress value of 389 MPa was determined for an alumina coating fabricated at a gas flow rate of 20 L/min.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20169","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Field-effect modulated water-splitting by photoinduced charge carriers on BiFeO3 film","authors":"Kah Hui Tan,&nbsp;Heng-Jui Liu,&nbsp;Jan-Chi Yang,&nbsp;Julie Karel,&nbsp;Wei Sea Chang","doi":"10.1111/jace.20182","DOIUrl":"https://doi.org/10.1111/jace.20182","url":null,"abstract":"<p>In this study, the field-effect generated by illuminated p-type ferroelectric bismuth ferrite (BiFeO₃ or BFO) semiconductor film is utilized to modulate the water-splitting performance of a system with a macroscopic spatial separation between the anode and cathode. When the BFO film in contact with an electrolyte is illuminated with a light of sufficiently high frequency, an electrolytic conducting channel is formed due to the field effect induced by photoexcited charge carriers in the BFO film, which in turn alters the water-splitting pathway and the reaction mechanism. The field effect can be modulated by changing the orientation of the ferroelectric polarization in the BFO film. With a BFO film of 4.5 mm channel length and an overall upward ferroelectric polarization direction, a ∼30% increase in water-splitting performance in a neutral-pH electrolyte is achieved in the presence of field-effect induced by a 20 mW 405 nm light source. The mechanism behind the field-effect modulation is also further verified by monitoring the pH of the electrolyte during the water-splitting process and conducting thresholding analysis on the recorded data. The field-effect modulation described in this study can potentially be used to enhance the performance of a photoelectrochemical water-splitting system by taking advantage of the presence of light illumination in the system or be utilized in electrochemical sensing applications.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20182","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of V substitutions on sintering behaviors and microwave dielectric properties of Ba4LiNb3O12 ceramic","authors":"Yulong Tian,&nbsp;Wei Wang,&nbsp;Xin Wang,&nbsp;Jie Li,&nbsp;Di Zhou","doi":"10.1111/jace.20183","DOIUrl":"https://doi.org/10.1111/jace.20183","url":null,"abstract":"&lt;p&gt;In this study, a series of Ba&lt;sub&gt;4&lt;/sub&gt;Li(Nb&lt;sub&gt;1-x&lt;/sub&gt;V&lt;sub&gt;x&lt;/sub&gt;)&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;12&lt;/sub&gt; (x = 0.05∼0.3) ceramics were synthesized using the solid-state reaction method. X-ray powder diffraction (XRD) analysis shows that the composite ceramics contain both Ba&lt;sub&gt;4&lt;/sub&gt;LiNb&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;12&lt;/sub&gt; and Ba&lt;sub&gt;3&lt;/sub&gt;(VO&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt; phases, without any other phases present. The grains consist of Ba&lt;sub&gt;4&lt;/sub&gt;LiNb&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;12&lt;/sub&gt; and Ba&lt;sub&gt;3&lt;/sub&gt;(VO&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;, as illustrated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Additionally, with the increase of V content, the grain size decreases, and the &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;ε&lt;/mi&gt;\u0000 &lt;mi&gt;r&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;${{varepsilon }_r}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; (microwave dielectric constant) decreases, the &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;τ&lt;/mi&gt;\u0000 &lt;msub&gt;\u0000 &lt;mspace&gt;&lt;/mspace&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$tau {{ }_f}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; (resonant frequency temperature coefficient) value decreases, and the &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;Q&lt;/mi&gt;\u0000 &lt;mo&gt;×&lt;/mo&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$Q times f$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; value increases (where &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mi&gt;Q&lt;/mi&gt;\u0000 &lt;annotation&gt;$Q$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; = quality factor = 1 / dielectric loss, and &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 &lt;annotation&gt;$f$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; = resonant frequency). The densest Ba&lt;sub&gt;4&lt;/sub&gt;Li(Nb&lt;sub&gt;0.7&lt;/sub&gt;V&lt;sub&gt;0.3&lt;/sub&gt;)&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;12&lt;/sub&gt;, with a &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;ε&lt;/mi&gt;\u0000 &lt;mi&gt;r&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;${{varepsilon }_r}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; of 31.3, &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;τ&lt;/mi&gt;\u0000 &lt;msub&gt;\u0000 &lt;mspace&gt;&lt;/mspace&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$tau {{ }_f}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; of + 70 ppm/°C, and high &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;Q&lt;/mi&gt;\u0000 &lt;mo&gt;×&lt;/mo&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$Q times f$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; of 42 850 GHz, was obtaine","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase diagrams of the BaF2–NdF3 and BaF2–PrF3 systems","authors":"Pavel P. Fedorov,&nbsp;Alexander A. Alexandrov,&nbsp;Anna A. Luginina,&nbsp;Valery V. Voronov,&nbsp;Elena V. Chernova,&nbsp;Sergey V. Kuznetsov","doi":"10.1111/jace.20152","DOIUrl":"https://doi.org/10.1111/jace.20152","url":null,"abstract":"<p>Phase formation in the BaF₂–NdF₃ and BaF₂–PrF₃ systems was studied by solid-phase annealing at 750°С and syntheses in molten NaNO₃ flux at 500°С. We observed the formation of Ba₁₋<i>_х</i>R<i>_х</i>F₂₊<i>_х</i> fluorite solid solutions in the aforementioned systems, and these solid solutions underwent ordering to form ordered Ba₄Nd₃F₁₇ and Ba₄Pr₃F₁₇ fluorite-like phases at 917°С and 880°С, respectively.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surface decoration of Nb2O5 hollow fibers by graphene oxide for enhanced photocatalytic degradation of methylene blue","authors":"Eduardo de Paulo Ferreira,&nbsp;Stella Rodrigues Ferreira Lima Ribeiro,&nbsp;Thiago Sousa e Sousa,&nbsp;Vicelma Luiz Cardoso,&nbsp;Miria Hespanhol Miranda Reis","doi":"10.1111/jace.20176","DOIUrl":"https://doi.org/10.1111/jace.20176","url":null,"abstract":"<p>This paper describes the fabrication of ceramic Nb₂O₅ hollow fibers covered by a thin graphene oxide (GO) layer using the vacuum-assisted dip-coating process for the efficient photocatalysis degradation of methylene blue (MB) under UVC light irradiation. Pristine and GO-coated Nb₂O₅ hollow fibers were evaluated for photocatalytic degradation at different initial dye concentrations and pH values. A photodegradation of 66.4% of the dye molecules was achieved using the pristine Nb₂O₅ hollow fibers at 57.4 ± 0.1 mg mL¹, initial MB concentration of 10 mg L⁻¹, and pH of 11. Under the same experimental conditions, the GO-coated Nb₂O₅ hollow fibers degraded 100% of the MB molecules. Additionally, the GO-coated Nb₂O₅ hollow fibers were successfully reused for four reaction cycles and exhibited suitable long-term stability. Thus, the proposed ceramic Nb₂O₅ hollow fibers with a surface decorated by a GO layer presented suitable characteristics for use as a photocatalyst in MB degradation.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced low-field energy storage performance in Nd3+-doped (Bi0.40K0.2Na0.2Sr0.2)TiO3 high-entropy ceramics","authors":"Jiawei Lin,&nbsp;Tianyu Liu,&nbsp;Dongdong Meng,&nbsp;Qiang He,&nbsp;Wenhui Ye,&nbsp;Jinxu Ma,&nbsp;Kepi Chen","doi":"10.1111/jace.20156","DOIUrl":"https://doi.org/10.1111/jace.20156","url":null,"abstract":"<p>The burgeoning requirement for compact electronic devices has intensified research into lead-free dielectric ceramics that offer superior recoverable energy storage density and efficiency at low electric fields. In this study, we report the synthesis of Nd³⁺-doped (Bi_0.4K_0.2Na_0.2Sr_0.2)TiO₃ perovskite ceramics via the solid-state reaction technique. The synthesized ceramics adopted a tetragonal crystal structure. As the concentration of Nd³⁺ ions increased, both the maximum dielectric constant (<i>ε</i>_m) and its corresponding temperature (<i>T</i>_m) decrease. The incorporation of Nd³⁺ ions perturbed the long-range ferroelectric order, leading to diminished maximum polarization (<i>P</i>_m) and remanent polarization (<i>P</i>_r). The ceramics achieved optimal properties with 12 mol% Nd³⁺ doping, showcasing a significant recoverable energy storage density of 1.50 J/cm³ at a low electric field of 140 kV/cm, along with an exceptional storage efficiency of 94.6%. This research not only highlights a promising candidate for dielectric materials in low electric field applications but also introduces an innovative approach to enhance energy storage performance.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}