Journal of the American Ceramic Society最新文献

{"title":"Rheology of alumina suspensions subjected to alternating current electric fields for freeze-casting","authors":"Sivakumar Chithamallu,&nbsp;Ruksana Baby,&nbsp;Jacob L. Jones,&nbsp;Dipankar Ghosh","doi":"10.1111/jace.70216","DOIUrl":"https://doi.org/10.1111/jace.70216","url":null,"abstract":"<p>Alternating current (AC) electric field can extrinsically tune freeze-cast microstructure, originating from field-induced increase in viscosity of ceramic suspensions. However, the changes that occur in a ceramic suspension and rheological behavior, ultimately affecting freeze-cast microstructure, are not well understood. Moreover, the effects of AC electrokinetic forces and temperature on viscosity need to be decoupled. The viscosity and temperature of ceramic suspensions subjected to AC field and direct heating were measured, revealing that the increase in viscosity is due to AC dielectrophoretic forces rather than field-induced heating of suspension. The shear thinning behavior of suspensions characterized using a power-law model reveals that the greater the viscosity, the greater the shear thinning. Although visual inspections and very high viscosity of suspensions indicated strong flocculation, in situ x-ray imaging pinpointed the field time window during which strong flocculation occurred. With increasing field duration, freeze-cast microstructure became increasingly dendritic; however, it was absent at higher field durations. For a short field duration, weak flocculation did not affect viscosity but enhanced the propensity for particle entrapment within ice crystals, resulting in a dendritic freeze-cast morphology. Longer field durations resulted in a strongly flocculated state with a strong network of particles, preventing freeze-cast microstructure formation.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ceramics.onlinelibrary.wiley.com/doi/epdf/10.1111/jace.70216","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197171","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":"Colors on Bizen stoneware fired in a firewood kiln: Reaction between the clay and potassium","authors":"Ryosuke Maki,&nbsp;Rieko Oketani,&nbsp;Shinzaburo Naka,&nbsp;Ai Shiroma,&nbsp;Minoru Fukuhara,&nbsp;Yoshihiro Kusano","doi":"10.1111/jace.70219","DOIUrl":"https://doi.org/10.1111/jace.70219","url":null,"abstract":"<p>Reddish, purplish red, brownish, and lustrous gold colors can appear on the surfaces of Bizen stoneware after firing in a firewood kiln. The reddish color results from the formation of an Fe-substituted spinel [(Mg,Al,Fe)₃O₄] and from composite particles consisting of corundum (α-Al₂O₃) and hematite (α-Fe₂O₃). The brownish and lustrous gold colors were found to be caused by the generation of dendritic luogufengite (<i>ɛ</i>-Fe₂O₃) and 100-nm-thick hematite particles, respectively. These oxides are formed by reactions between the Bizen clay and K supplied by the firewood used as fuel. The present study reproduced these colors by heating Bizen clay pellets with K₂CO₃ instead of firewood in an electric furnace. Specifically, a reddish sample was obtained by heating at 1230°C for 5 h in air. A brownish color appeared after annealing pellets at 1200°C for 2 h in air after heating at 1230°C with K₂CO₃ under an Ar:CO (90:10, v:v) mixture for 5 h. A lustrous gold color was produced by annealing at 900°C for 2 h in air after heating in the same Ar:CO mixture. The color and chemical composition of the stoneware surfaces were found to be largely determined by the temperature at which the specimen was heated in air.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197172","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":"CdCu3Ti3MnO12−δ quadruple perovskites: High-pressure synthesis, structural, magnetic, and dielectric properties","authors":"Jie Ding,&nbsp;Xinhua Zhu","doi":"10.1111/jace.70201","DOIUrl":"https://doi.org/10.1111/jace.70201","url":null,"abstract":"&lt;p&gt;The incorporation of magnetic transition metal ions at the B-site, or substitution-induced distortions even by non-magnetic cations, can introduce concurrent structural and exchange-interaction complexities. The present work reports on the structural, dielectric, and magnetic properties of CdCu&lt;sub&gt;3&lt;/sub&gt;Ti&lt;sub&gt;3&lt;/sub&gt;MnO&lt;sub&gt;12−&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;δ&lt;/sub&gt;&lt;/i&gt; (CCTMO) quadruple perovskite oxide ceramics synthesized under high-pressure and high-temperature (HP–HT) conditions (6 GPa, 1173 K, 1273 K, and 1373 K). X-ray diffraction data and their Rietveld refinements reveal that the CCTMO oxides crystallize in a cubic CdCu&lt;sub&gt;3&lt;/sub&gt;Ti&lt;sub&gt;4&lt;/sub&gt;O&lt;sub&gt;12&lt;/sub&gt;-type quadruple perovskite structure with space group of &lt;i&gt;Im&lt;/i&gt; &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mover&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;mo&gt;¯&lt;/mo&gt;\u0000 &lt;/mover&gt;\u0000 &lt;annotation&gt;$bar{3}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;. X-ray photoelectron spectroscopy spectra verify that the valence states can be represented as Cd&lt;sup&gt;2+&lt;/sup&gt; &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;Cu&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;mo&gt;+&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;Ti&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;4&lt;/mn&gt;\u0000 &lt;mo&gt;+&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;${mathrm{Cu}}_3^{2 + }{mathrm{Ti}}_3^{4 + }$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; Mn&lt;sup&gt;3+&lt;/sup&gt;O&lt;sub&gt;12−&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;δ&lt;/sub&gt;&lt;/i&gt; in an ionic model. Dielectric spectroscopy unveiled relaxor-like dielectric behaviors for all the samples (sintered at 1173, 1273, and 1373 K) with thermal activation energies of 0.39, 0.42, and 0.45 eV, respectively. The movements of the singly ionized oxygen vacancies (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;V&lt;/mi&gt;\u0000 &lt;mi&gt;O&lt;/mi&gt;\u0000 &lt;mo&gt;·&lt;/mo&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;annotation&gt;$V_{mathrm{O}}^ cdot $&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;) are responsible for the temperature-dependent relaxor-like dielectric behaviors observed between 173 and 500 K. At 10&lt;sup&gt;5&lt;/sup&gt; Hz, the CCTMO samples sintered at 1173 K had the dielectric constant (&lt;i&gt;ε&lt;/i&gt;&lt;sub&gt;r&lt;/sub&gt;) value of ∼119 and dielectric loss (tan &lt;i&gt;δ&lt;/i&gt;) value of 0.82, whereas the &lt;i&gt;ε&lt;/i&gt;&lt;sub&gt;r&lt;/sub&gt; = 81 and tan &lt;i&gt;δ&lt;/i&gt; = 0.72 for the CCTMO samples sintered at 1373 K. Ferromagnetic (FM) behavior was observed at 2 K in these CCTMO samples with saturation magnetizations of 2.90–3.14 μ&lt;sub&gt;B&lt;/sub&gt;/f.u., whereas paramagnetic behavior appeared at 300 K. The Curie–Weiss fittings of the inverse magnetic s","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197120","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":"Impact of oxygen vacancies on the thermophysical properties of the phase-pure Mg2TiO4 ceramics","authors":"Ajit Bhalchandra Payer,&nbsp;Annu Kumar Lakshya,&nbsp;Anirban Chowdhury","doi":"10.1111/jace.70206","DOIUrl":"https://doi.org/10.1111/jace.70206","url":null,"abstract":"&lt;p&gt;Phase-pure, highly dense (∼97%) magnesium orthotitanate (Mg&lt;sub&gt;2&lt;/sub&gt;TiO&lt;sub&gt;4&lt;/sub&gt;) ceramics were processed via two distinct pressureless sintering techniques, e.g., conventional sintering in air and vacuum sintering in a hot press unit. The conventionally sintered Mg&lt;sub&gt;2&lt;/sub&gt;TiO&lt;sub&gt;4&lt;/sub&gt; ceramic (CS) exhibited the highest thermal conductivity value of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;10.2&lt;/mn&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mspace&gt;&lt;/mspace&gt;\u0000 &lt;mi&gt;W&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;mi&gt;m&lt;/mi&gt;\u0000 &lt;mo&gt;·&lt;/mo&gt;\u0000 &lt;mi&gt;K&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$10.2{mathrm{ W}}/{mathrm{m}}cdot{mathrm{K}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, reported to date. In contrast, vacuum sintered Mg&lt;sub&gt;2&lt;/sub&gt;TiO&lt;sub&gt;4&lt;/sub&gt; ceramic (VS) demonstrated a comparatively lower thermal conductivity value of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;∼&lt;/mo&gt;\u0000 &lt;mn&gt;5&lt;/mn&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mspace&gt;&lt;/mspace&gt;\u0000 &lt;mi&gt;W&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;mi&gt;m&lt;/mi&gt;\u0000 &lt;mo&gt;·&lt;/mo&gt;\u0000 &lt;mi&gt;K&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$sim 5{mathrm{ W}}/{mathrm{m}}cdot{mathrm{K}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;. The measured coefficient of thermal expansion (CTE) for CS and VS at 1683 K was &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;10.302&lt;/mn&gt;\u0000 &lt;mo&gt;×&lt;/mo&gt;\u0000 &lt;msup&gt;\u0000 &lt;mn&gt;10&lt;/mn&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;6&lt;/mn&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mspace&gt;&lt;/mspace&gt;\u0000 &lt;mspace&gt;&lt;/mspace&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$10.302 times {{10}^{ - 6{mathrm{ }}}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; and &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;8.567&lt;/mn&gt;\u0000 &lt;mo&gt;×&lt;/mo&gt;\u0000 &lt;msup&gt;\u0000 &lt;mn&gt;10&lt;/mn&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;6&lt;/mn&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mspace&gt;&lt;/mspace&gt;\u0000 &lt;mspace&gt;&lt;/mspace&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msup&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;K&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$8.567 times {{10}^{ - 6{math","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197137","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":"Design and simulation of [001]-textured PMN-PZT/epoxy 1-3 piezoelectric composites for acoustic transducer","authors":"Liqing Hu,&nbsp;Chenyu Qiu,&nbsp;Mingyang Tang,&nbsp;Ruoqi Jin,&nbsp;Shuguang Zheng,&nbsp;Zhuo Xu,&nbsp;Yongke Yan","doi":"10.1111/jace.70215","DOIUrl":"https://doi.org/10.1111/jace.70215","url":null,"abstract":"<p>Textured piezoelectric materials have become the key materials for the next generation of high-performance acoustic transducers because of their high piezoelectric constants and large electromechanical coupling coefficients. This paper presents the modeling and fabrication of the [001]-textured 0.4 Pb(Mg_1/3Nb_2/3)O₃‒0.25PbZrO₃‒0.35PbTiO₃‒0.5% MnO₂ ceramics/epoxy 1-3 piezoelectric composite (T-Mn-PMN-PZT/epoxy 1-3 composite). The composite was analyzed using finite element method simulations, and prepared by dice and fill method for experimental investigation. The simulation results demonstrate that the composite design achieves optimal performance when the piezoelectric phase volume fraction is approximately 60 vol.% and the aspect ratio is around 0.6. The fabricated T-Mn-PMN-PZT/epoxy composite exhibits excellent electromechanical coupling properties (0.76‒0.80) yielding a significantly enhanced piezoelectric figure of merit (70893 × 10^‒15 m²/N), and maintains stable performance across a wide temperature range from ‒20°C to 80°C. The T-Mn-PMN-PZT/epoxy composite-based transducer demonstrated superior performance, achieving a 45% higher <i>V</i>_pp (6.75 V) and nearly double the bandwidth (31.1%) at ‒6 dB compared to T-Mn-PMN-PZT monolithic ceramic-based transducers. This composite demonstrates exceptional suitability for high-performance transducer applications.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197143","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":"Vaporization and thermodynamic properties of ceramics based on the SrO–Al2O3–SiO2 system","authors":"E. A. Balabanova,&nbsp;N. G. Tyurnina,&nbsp;S. I. Lopatin,&nbsp;Z. G. Tyurnina,&nbsp;S. M. Shugurov,&nbsp;N. M. Barabanov","doi":"10.1111/jace.70197","DOIUrl":"https://doi.org/10.1111/jace.70197","url":null,"abstract":"<p>The vaporization behavior and thermodynamic properties of the SrO–Al₂O₃–SiO₂ system were investigated by Knudsen effusion mass spectrometry (KEMS) across a composition range of 10–90 mol.% SrO and Al₂O₃/SiO₂ molar ratios of 0.5, 1.0, and 1.5. Experiments were conducted at the temperature 2000 K using a tungsten twin effusion cell to measure partial pressures of gaseous species (Sr, SiO, O₂) and derive component activities, Gibbs energies, and excess Gibbs energies. The system exhibited slight negative deviations from ideality, indicative of synergistic interactions among SrO, Al₂O₃, and SiO₂. Compositions with 50–60 mol.% SrO demonstrated minimized evaporation rates and enhanced thermodynamic stability, attributed to the formation of stable Sr–Al–Si–O phases. These findings provide critical insights for designing high-temperature ceramics for aerospace applications, where thermal resilience and low volatility under extreme conditions are paramount.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197144","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":"Cold sintering of α-alumina using functionalized boehmite: A cost-effective approach to reduce sintering temperature","authors":"Christopher Grimes,&nbsp;Chloe A. Button,&nbsp;Ao Zhao,&nbsp;Latham Haigh,&nbsp;Beatriz Almeida,&nbsp;Ines Vilarinho,&nbsp;M. Elisabete V. Costa,&nbsp;Eduardo Mantheakis,&nbsp;Ian M. Reaney","doi":"10.1111/jace.70208","DOIUrl":"https://doi.org/10.1111/jace.70208","url":null,"abstract":"<p>A novel cold-assisted sintering process using a combination of functionalized boehmite and α-alumina particles is demonstrated. Functionalized boehmite and α-alumina composites were initially densified using a cold sintering process at &lt;300°C followed by heat treatment at 1400°C‒1450°C (∼200°C‒300°C lower than conventionally sintered α-alumina). Highest relative densities (99%) were achieved using meso-scale α-alumina (<i>D</i>₅₀ = 720 nm) in a 50:50 wt% mixture with boehmite, functionalized in 2 M acetic acid. The high densities at low temperature were attributed to easy propagation of the transformation to α phase within the dense boehmite matrix, accompanied by enhanced nucleation on the surface of the alumina particles. Critical aspects of the transformation sequence from functionalized boehmite to α-alumina were characterized using Raman and Fourier transform infrared spectroscopy. Preliminary hardness measurements were comparable with conventional alumina sintered at ∼1650°C and initial microwave measurements showed promise for the fabrication of high-temperature co-fired ceramic substrates in electronics.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197138","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":"A-site engineered NaNbO3 lead-free antiferroelectrics toward well-defined double hysteresis loop","authors":"Guiqi Lei,&nbsp;Li Ma,&nbsp;Fanfei Xu,&nbsp;Zhenyong Cen,&nbsp;Nengneng Luo","doi":"10.1111/jace.70207","DOIUrl":"https://doi.org/10.1111/jace.70207","url":null,"abstract":"<p>NaNbO₃-based lead-free antiferroelectric (AFE) ceramics have long exhibited ferroelectric (FE)-like polarization–electric field (<i>P</i>–<i>E</i>) hysteresis loops resulting from the irreversible transition of the AFEP-phase to the FE Q-phase. In this study, we demonstrated that the reversibility of the AFE–FE phase transition can be significantly enhanced via A-site chemical substitution. Notably, the (Na_0.48Ca_0.06Ag_0.4)NbO₃ ceramic exhibited well-defined double <i>P</i>–<i>E</i> loops characterized by reduced hysteresis, low remnant polarization, and high electric field for the AFE–FE phase transition. The Ca²⁺ and Ag⁺ co-modification was beneficial for stabilizing the AFE P-phase, owing to the decrease in both the tolerance factor and the average electronegativity difference. Structural analysis revealed that A-site cation displacement was substantially reduced via the A-site ion modification. This study presents a new strategy for achieving reversible AFE-to-FE phase transitions with well-defined double <i>P</i>–<i>E</i> loops in NaNbO₃-based AFE materials, which can also be extended to discover a range of novel lead-free AFEs.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197096","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":"Self-healing processing in SiO2-AlB2 and SiO2-SiB4 glass composites for high-temperature applications","authors":"François O. Méar,&nbsp;Sandra Castanié,&nbsp;Renaud Podor","doi":"10.1111/jace.70200","DOIUrl":"https://doi.org/10.1111/jace.70200","url":null,"abstract":"<p>AlB₂ and SiB₄ are used as active particles to design model SiO₂-20 vol.% active particles composites for high-temperature applications. The oxidation of AlB₂ and SiB₄ particles in air at <i>T</i> = 1000°C–1050°C rapidly leads to the formation of an important quantity of liquid that can heal cracks. Model composites have been used to determine liquid flowing speed into the cracks and to discuss the effect of liquid properties, such as viscosity and wettability, on healing efficiency. The main role of the secondary reaction of the liquid with the matrix to form a dense solid-state compound, from which crack healing stabilization is expected, is underlined.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ceramics.onlinelibrary.wiley.com/doi/epdf/10.1111/jace.70200","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197094","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":"PZT-PMS-PIN high-power piezoelectric ceramics exhibiting elevated vibration velocities under low electric fields","authors":"Xinghua Xu,&nbsp;Wenbin Tang,&nbsp;Huihui Liu,&nbsp;Zhiqin Zen,&nbsp;Shicheng Ding,&nbsp;Yiping Wang,&nbsp;Ying Yang,&nbsp;Yaojin Wang,&nbsp;Guoliang Yuan","doi":"10.1111/jace.70205","DOIUrl":"https://doi.org/10.1111/jace.70205","url":null,"abstract":"<p>High-power piezoelectric ceramics typically require sustained vibration under strong AC electric fields. Therefore, multiple parameters such as piezoelectric coefficient <i>d</i>₃₃, mechanical quality factor <i>Q</i>_m, and Curie temperature <i>T</i>_c should be optimized concurrently to enhance their vibrational speed and durability. Here (0.95-<i>x</i>)Pb(Zr_0.48Ti_0.52)O₃-0.05 Pb(Mn_1/3Sb_2/3)O₃-<i>x</i>Pb(In_1/2Nb_1/2)O₃ ceramics were developed. As the value of <i>x</i> increased from 0 to 0.06, the piezoelectric coefficient <i>d</i>₃₃ improved from 275 pC/N to 440 pC/N, the electromechanical coupling coefficient <i>k</i>_p increased from 0.53 to 0.64. Conversely, the quasi-static <i>Q</i>_m decreased from 2397 to 1754 and the <i>T</i>_c shifted from 326°C and 317°C. The ceramic with an optimal composition at <i>x</i> = 0.06 demonstrated well-coordinated high values for <i>d</i>₃₃, <i>Q</i>_m, <i>k</i>_p, and <i>T</i>_c values. Under an AC electric field of 25 V/mm, it exhibited a high-filed <i>Q</i>_m of 1226, an impressive vibration speed <i>v</i>₀ of 0.99 m/s at 25°C and 0.89 m/s at 120°C. These results indicate excellent vibration durability and temperature stability. This advancement could significantly contribute to the development of high-performance ultrasonic motors, sonar systems, among other applications.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197095","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}