Journal of The European Ceramic Society最新文献_第6页

Influence of tabular and white fused alumina aggregates on Young’s modulus evolution versus temperature in refractory castables 板状和白色刚玉骨料对耐火浇注料杨氏模量随温度变化的影响

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-05-31 DOI: 10.1016/j.jeurceramsoc.2025.117583

Kwasi Addo Boateng , Robert Piotr Kaczmarek , Jean-Michel Auvray , Christoph Wöhrmeyer , Elsa Thune , Nicolas Tessier-Doyen , Marc Huger

{"title":"Influence of tabular and white fused alumina aggregates on Young’s modulus evolution versus temperature in refractory castables","authors":"Kwasi Addo Boateng , Robert Piotr Kaczmarek , Jean-Michel Auvray , Christoph Wöhrmeyer , Elsa Thune , Nicolas Tessier-Doyen , Marc Huger","doi":"10.1016/j.jeurceramsoc.2025.117583","DOIUrl":"10.1016/j.jeurceramsoc.2025.117583","url":null,"abstract":"<div><div>The main alumina aggregates used in refractory applications are Tabular Alumina (TA) and White Fused Alumina (WFA). The different processing routes applied in producing TA and WFA greatly impact the final microstructure of these aggregates. The effects of the distinct microstructural properties in the aggregates in terms of grain sizes and porosity on the thermomechanical behaviour of refractory castables are not well understood. Young's modulus evolution with temperature was measured on alumina-based refractory castables containing either tabular or white fused alumina aggregates. Acoustic emissions were also measured to monitor microcracks developed in the refractory castables during cooling after being subjected to high temperatures. Fine TA and WFA aggregates were discovered to induce little to no microcracks in the refractory castables. Meanwhile, coarse WFA aggregates induced significant microcracks compared to TA aggregates in the alumina-based refractory castables. This paper has demonstrated successfully the influence of the varying grain sizes within alumina aggregates in promoting non-linear behaviour in refractory castables that potentially can be promising in thermal shock applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117583"},"PeriodicalIF":5.8,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144202447","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

In-situ formation mechanism and isothermal oxidation behaviors at 1700℃ and 1800℃ of (Zr,Hf)B2-(Hf,Zr)Si-HfCrSi2/TaSi2 composite coating prepared on Ta12W alloy by one-step vacuum reaction sintering 一步真空反应烧结在Ta12W合金上制备（Zr,Hf）B2-(Hf,Zr)Si-HfCrSi2/TaSi2复合涂层的原位形成机理及1700℃和1800℃等温氧化行为

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-05-31 DOI: 10.1016/j.jeurceramsoc.2025.117584

Tingyang Wang , Xin Wang , Tao Yang , Shaopeng Wang

{"title":"In-situ formation mechanism and isothermal oxidation behaviors at 1700℃ and 1800℃ of (Zr,Hf)B2-(Hf,Zr)Si-HfCrSi2/TaSi2 composite coating prepared on Ta12W alloy by one-step vacuum reaction sintering","authors":"Tingyang Wang , Xin Wang , Tao Yang , Shaopeng Wang","doi":"10.1016/j.jeurceramsoc.2025.117584","DOIUrl":"10.1016/j.jeurceramsoc.2025.117584","url":null,"abstract":"<div><div>Ta-W alloys with excellent mechanical properties above 1700℃ can rapidly fail due to “catastrophic” oxidation. In this investigation, a novel (Zr,Hf)B<sub>2</sub>-(Hf,Zr)Si-HfCrSi<sub>2</sub>/TaSi<sub>2</sub> coating was in-situ prepared via one-step vacuum reaction sintering on the Ta12W alloy. This coating remained intact after being respectively oxidized at 1700°C for 5 h and at 1800°C for 60 min. Oxide scales primarily composed of Ta<sub>2</sub>O<sub>5</sub>(TaO<sub>2</sub>)-HfO<sub>2</sub>-ZrO<sub>2</sub>-B<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> glass with (Hf,Zr)SiO<sub>4</sub> and (Hf,Zr)<sub>6</sub>Ta<sub>2</sub>O<sub>17</sub> at 1700°C and with (Hf,Zr)<sub>6</sub>Ta<sub>2</sub>O<sub>17</sub> at 1800°C were formed. The composite oxide scale could prevent the further oxidation of Cr<sub>2</sub>O<sub>3</sub> at 1700℃. Additionally, micro-nano sized TaO<sub>2</sub> particles rather than Ta<sub>2</sub>O<sub>5</sub> precipitated within the vitreous glass.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117584"},"PeriodicalIF":5.8,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203462","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

High-entropy aluminate spinel oxides: A pathway to advanced functional materials 高熵铝酸盐尖晶石氧化物：通往先进功能材料的途径

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-05-30 DOI: 10.1016/j.jeurceramsoc.2025.117582

Emilija Nidžović , Branko Matović , Peter Tatarko , Naser Hosseini , Ondrej Hanzel , Lidija Radovanović , Aleksandra Dapčević , Marija Prekajski Đorđević

{"title":"High-entropy aluminate spinel oxides: A pathway to advanced functional materials","authors":"Emilija Nidžović , Branko Matović , Peter Tatarko , Naser Hosseini , Ondrej Hanzel , Lidija Radovanović , Aleksandra Dapčević , Marija Prekajski Đorđević","doi":"10.1016/j.jeurceramsoc.2025.117582","DOIUrl":"10.1016/j.jeurceramsoc.2025.117582","url":null,"abstract":"<div><div>This study investigates the synthesis and characterization of high-entropy aluminate spinel oxides (Al-HESOs) with three distinct compositions: (Co,Mn,Ni,Zn,Cu)Al<sub>2</sub>O<sub>4</sub>, (Co,Mn,Ni,Zn)Al<sub>2</sub>O<sub>4</sub>, and (Co,Mn,Ni,Mg)Al<sub>2</sub>O<sub>4</sub>. Using the self-propagating room temperature method for synthesis and spark plasma sintering for densification, single-phased Al-HESOs with relative densities up to 97 % were successfully obtained. Structural, mechanical, and thermal properties were comprehensively analysed, demonstrating significant tunability. Notably, the inclusion of Cu<sup>2+</sup> drastically reduced the Young's modulus (3.8 GPa) while maintaining high hardness (9.9 GPa) and low thermal diffusivity (0.78 mm² s⁻¹ at room temperature – 0.63 mm² s⁻¹ at 600 °C), positioning (Co,Mn,Ni,Zn,Cu)Al₂O₄ as a promising candidate for strain-compliant thermal barrier coatings. These findings establish a novel synthesis and densification route for Al-HESOs and their potential for applications in advanced energy, sensing, and thermal management technologies.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117582"},"PeriodicalIF":5.8,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189897","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

Phase equilibrium and optical properties of intermediate phases in CaO–Nd2O3–Nb2O5 ternary system at 1200 °C CaO-Nd2O3-Nb2O5三元体系在1200℃时的相平衡和中间相光学性质

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-05-30 DOI: 10.1016/j.jeurceramsoc.2025.117580

Bożena Pilarek, Irena Szczygieł

{"title":"Phase equilibrium and optical properties of intermediate phases in CaO–Nd2O3–Nb2O5 ternary system at 1200 °C","authors":"Bożena Pilarek, Irena Szczygieł","doi":"10.1016/j.jeurceramsoc.2025.117580","DOIUrl":"10.1016/j.jeurceramsoc.2025.117580","url":null,"abstract":"<div><div>Subsolidus phase equilibria in the CaO–Nd<sub>2</sub>O<sub>3</sub>–Nb<sub>2</sub>O<sub>5</sub> ternary system and optical properties of the phases formed within this system have been investigated. Twenty-nine samples covering the entire composition range of the ternary oxide system were prepared using the ceramic method. Using powder X-ray diffraction (PXRD) and differential thermal analysis (DSC/TGA), isothermal cross-sections of the ternary system, distinguishing partial subsystems in the subsolidus region at 1200 °C, was constructed. The results highlight the formation of solid solutions and pseudo-binary eutectic systems with limited solid-state solubility and provide insights into the thermodynamic stability of the materials. Additionally, UV–visible diffuse reflectance spectra of calcium and neodymium niobates were analyzed, revealing promising absorption characteristics for photocatalytic and optoelectronic applications. The study emphasizes these materials' potential for designing high-performance sensors and devices with tunable optical properties.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117580"},"PeriodicalIF":5.8,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184866","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

Calcium oxide-stabilized zirconia with high toughness, strength, aging resistance and transformation-induced plasticity 氧化钙稳定氧化锆具有高韧性、高强度、耐老化和相变诱发塑性

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-05-30 DOI: 10.1016/j.jeurceramsoc.2025.117581

Alberto Vettorel , Bart Van Meerbeek , Jef Vleugels , Fei Zhang

{"title":"Calcium oxide-stabilized zirconia with high toughness, strength, aging resistance and transformation-induced plasticity","authors":"Alberto Vettorel , Bart Van Meerbeek , Jef Vleugels , Fei Zhang","doi":"10.1016/j.jeurceramsoc.2025.117581","DOIUrl":"10.1016/j.jeurceramsoc.2025.117581","url":null,"abstract":"<div><div>Monolithic zirconia ceramics generally present with trade-offs between toughness, strength and hydrothermal aging-resistance, highlighting the need to develop new zirconia ceramics that are better balanced for these key properties. In this study, zirconia containing 4.5 mol% calcium-oxide stabiliser (4.5Ca-TZP) was pressed from nanoparticles and pressureless sintered at 1200–1325°C. Fully dense 4.5Ca-TZP could be obtained at 1250–1275°C with a nanometric microstructure (average grain size <100 nm) and about 20 wt% cubic-zirconia. Optimal mechanical properties were reached when sintered at 1250°C and 1275°C, combining a four-point-bending (4PB) strength of 1170 ± 140 MPa with a single-edge-V-notched-beam toughness of 9.73 ± 0.45 MPa m<sup>1/2</sup>. Furthermore, this nanometric zirconia was highly transformable, showing transformation-induced plasticity before failure with an evident deviation from linear behavior starting around 75 % of the 4PB strength. Strikingly, 4.5Ca-TZP was also aging-resistant without degradation observed after 20 hours of aging at 134°C. Additionally, its translucency was similar to that of conventional 3Y-TZPs.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117581"},"PeriodicalIF":5.8,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203463","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

Effect of high pressure on microstructure and mechanical and optical properties of nano-structured MgAl2O4 spinel fabricated by High Pressure Spark Plasma Sintering 高压对高压火花等离子烧结MgAl2O4尖晶石微观结构及力学光学性能的影响

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-05-29 DOI: 10.1016/j.jeurceramsoc.2025.117579

Sandrine Cottrino , Thomas Gaudisson , Thierry Douillard , Nicholas Blanchard , Sylvain Meille , Laurent Gremillard , Matthieu Mercury , Sylvie Le Floch

引用次数: 0

Influence of powder characteristics on the rheology of ceria-based screen-printing pastes for solid oxide cell applications 粉末特性对固体氧化电池用二氧化铈基丝网印刷浆料流变性的影响

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-05-29 DOI: 10.1016/j.jeurceramsoc.2025.117570

Denise J. Ramler , Robert Mücke , Christian Lenser , Olivier Guillon , Norbert H. Menzler

{"title":"Influence of powder characteristics on the rheology of ceria-based screen-printing pastes for solid oxide cell applications","authors":"Denise J. Ramler , Robert Mücke , Christian Lenser , Olivier Guillon , Norbert H. Menzler","doi":"10.1016/j.jeurceramsoc.2025.117570","DOIUrl":"10.1016/j.jeurceramsoc.2025.117570","url":null,"abstract":"<div><div>Screen-printing is a widely utilized method for fabricating solid oxide electrolysis cells (SOECs), a promising technology for efficient hydrogen production. This study focuses on the rheological characterization of screen-printing pastes, emphasizing the influence of ceramic powder properties on rheological behavior and layer features. Conventional metrics such as viscosity, or binder and ceramic content provided in wt% are shown to inadequately describe paste characteristics. Instead, we propose the use of dynamic rheological properties, including damping factor and yield point, and introduce a bimodality coefficient <span><math><mi>φ</mi></math></span> to be able to quantify and correlate particle size distribution shapes with these rheological properties. Results demonstrate that dry layer thickness and dimensional accuracy correlate strongly with the damping factor, revealing that pastes with higher damping factors exhibit thinner layers due to increased viscous behavior. Additionally, increasing the amount of binder in relation to the specific surface area (SSA) of the ceramic particles weakens the 3-dimensional paste network, decreasing yield points and shifting paste behavior toward predominantly viscous behavior. Analysis of SSA as well as particle size distribution (PSD) and their correlation with rheology highlights the destabilizing effect of agglomerates in asymmetrical and bimodal particle size distributions, underscoring the need for comprehensive powder characterization.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117570"},"PeriodicalIF":5.8,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144222511","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

Formation and mechanism of carbon coating on carbon fibers through glucose-to-carbon conversion and its effect on the mechanical properties of Cf/ZrB2-SiC composites 葡萄糖-碳转化炭膜在碳纤维上的形成、机理及其对Cf/ZrB2-SiC复合材料力学性能的影响

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-05-29 DOI: 10.1016/j.jeurceramsoc.2025.117569

Huiyi Fang , Zonghao Sheng , Wenxia Wang , Chuncheng Wei , Shuang Li , Xin Geng , Xiaowei Li , Nannan Zhu , Guangwu Wen , Shun Dong , Peng Wang

{"title":"Formation and mechanism of carbon coating on carbon fibers through glucose-to-carbon conversion and its effect on the mechanical properties of Cf/ZrB2-SiC composites","authors":"Huiyi Fang , Zonghao Sheng , Wenxia Wang , Chuncheng Wei , Shuang Li , Xin Geng , Xiaowei Li , Nannan Zhu , Guangwu Wen , Shun Dong , Peng Wang","doi":"10.1016/j.jeurceramsoc.2025.117569","DOIUrl":"10.1016/j.jeurceramsoc.2025.117569","url":null,"abstract":"<div><div>The protection for carbon fibers is crucial for carbon fiber-reinforced materials. Carbon coatings were prepared on carbon fibers through gelation, hydrothermal caramelization and pyrolysis, with glucose as precursor of carbon. The glucose-to-carbon conversion mechanism was explored, as well as the effect of high pressure in hydrothermal reactor and the catalytic role of KCl. The high pressure suppressed gas escape and was beneficial to the formation of dense carbon coating. The KCl promoted the generation of 5-HMF, thereby accelerated the glucose-to-caramel conversion. C<sub>f</sub>/ZrB<sub>2</sub>-SiC composites were prepared by introducing ZrB<sub>2</sub>-SiC slurry into the carbon fiber preform and hot press sintering. The carbon coating protected the carbon fibers from damage during sintering at high temperature. The carbon coating significantly improved the flexural strength, fracture toughness, and fracture work of C<sub>f</sub>/ZrB<sub>2</sub>-SiC composites from 122 MPa, 3.24 MPa‧m<sup>1/2</sup>, and 231.6 J/m<sup>2</sup> to 321 MPa, 5.87 MPa‧m<sup>1/2</sup>, and 567.1 J/m<sup>2</sup>, respectively.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117569"},"PeriodicalIF":5.8,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178256","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

3D-printable scaffolds via DIW from ceramic pastes of ZnO nanoparticles without organic binders and their application as reusable photocatalysts for the degradation of Bisphenol A 无有机粘合剂的ZnO纳米颗粒陶瓷糊状物的DIW 3d打印支架及其作为降解双酚A的可重复使用光催化剂的应用

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-05-29 DOI: 10.1016/j.jeurceramsoc.2025.117578

Andrea Y. Cárcamo-Gutiérrez, Manuel Alejandro Ávila-López, Tania E. Lara-Ceniceros, José Bonilla-Cruz

{"title":"3D-printable scaffolds via DIW from ceramic pastes of ZnO nanoparticles without organic binders and their application as reusable photocatalysts for the degradation of Bisphenol A","authors":"Andrea Y. Cárcamo-Gutiérrez, Manuel Alejandro Ávila-López, Tania E. Lara-Ceniceros, José Bonilla-Cruz","doi":"10.1016/j.jeurceramsoc.2025.117578","DOIUrl":"10.1016/j.jeurceramsoc.2025.117578","url":null,"abstract":"<div><div>Direct ink writing (DIW) is an efficient and cost-effective additive manufacturing technique for fabricating ceramic architectures. Zinc oxide nanoparticles (ZnO_NP) are promising photocatalysts due to their chemical stability, low toxicity, and high efficiency. However, the development of DIW-printable ZnO_NP-based pastes remains limited. This work presents the first systematic study to successfully develop 3D-printable ZnO_NP-based ceramic pastes (63 wt% solids) without organic binders. A solvent:co-solvent system (deionized water:ethylene glycol) and silica nanoparticles as inorganic binders enabled the fabrication of robust and self-supporting ZnO_NP-based scaffolds under an optimal formulation window. The photocatalytic potential was demonstrated through Bisphenol A degradation, achieving 95–85 % degradation over successive cycles, including post-reactivation. Unlike conventional powder-based photocatalysts, 3D-printed scaffolds allow efficient recovery and reuse, offering a sustainable alternative for environmental remediation. This novel approach pioneers DIW-printable ZnO_NP-based pastes without organic binders, paving the way for future advancements in photocatalytic applications and additive manufacturing of functional ceramics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117578"},"PeriodicalIF":5.8,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185569","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

Impact of Li-substitution on dielectric, structural and sintering behavior of Lix(Sr0.5Ba0.5)1−x/2Nb2O6 ceramics li取代对Lix(Sr0.5Ba0.5)1−x/2Nb2O6陶瓷介电、结构和烧结性能的影响

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-05-29 DOI: 10.1016/j.jeurceramsoc.2025.117567

Roberto Köferstein, Jonas Jacobs, Stefan G. Ebbinghaus

{"title":"Impact of Li-substitution on dielectric, structural and sintering behavior of Lix(Sr0.5Ba0.5)1−x/2Nb2O6 ceramics","authors":"Roberto Köferstein, Jonas Jacobs, Stefan G. Ebbinghaus","doi":"10.1016/j.jeurceramsoc.2025.117567","DOIUrl":"10.1016/j.jeurceramsoc.2025.117567","url":null,"abstract":"<div><div>Li<sub><em>x</em></sub>(Sr<sub>0.5</sub>Ba<sub>0.5</sub>)<sub>1−<em>x</em>/2</sub>Nb<sub>2</sub>O<sub>6</sub> ceramics were prepared by a solid state synthesis and sintered at 1300 °C. XRD investigations reveal single phase samples up to a substitution limit of <em>x</em> = 0.275. For higher lithium contents, the appearance of LiNbO<sub>3</sub> as secondary phase was observed. The density of the ceramics increases with lithium content. The microstructures show globular grains which turns to pillar-like grains with rising lithium substitution. Dielectric investigations confirm relaxor ferroelectric behavior and the diffuse phase transition is shifted towards higher temperatures with increasing lithium content from 129 °C (<em>x</em> = 0) to 221 °C (<em>x</em> = 0.275). The diffuseness coefficient increases with the lithium content. From high-temperature XRD measurements the length of the tetragonal cell parameter <em>c</em> decreases with increasing temperature, reaches a minimum at about 150 −230 °C (depending on <em>x</em>) and afterward increases with increasing temperature. Additionally, a significant shift of the Nb(2) position with temperature can be observed.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117567"},"PeriodicalIF":5.8,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203345","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