Journal of The European Ceramic Society最新文献

{"title":"Sintering of lunar regolith simulants using a domestic microwave: A rapid and energy-efficient strategy for construction material fabrication","authors":"","doi":"10.1016/j.jeurceramsoc.2024.117047","DOIUrl":"10.1016/j.jeurceramsoc.2024.117047","url":null,"abstract":"<div><div>Utilization of lunar regolith as building material to construct future lunar bases is receiving increasing attention. The sintering method does not need additional additives, but still has some restrictions. This study presents a rapid and energy-efficient strategy for sintering lunar regolith simulants (i.e., mare (CLRS-1) and highlands (SC-080)), where a domestic microwave and ceramic fiber microwave kiln performed hybrid heating for 11 and 14 minutes, respectively. The corresponding energy consumption is just 69 and 98 MJ/kg, respectively. The low melting point minerals in the simulants melt at high temperatures, causing the grains to bond to each other. The density of sintered samples reached 2.34 and 2.23 g/cm³, respectively. The mechanical and thermal properties of both samples are comparable to those of Earth-based concrete and brick, and show excellent durability in a simulated lunar surface environment, revealing a promising processing route for early lunar surface construction.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":null,"pages":null},"PeriodicalIF":5.8,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578411","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}

{"title":"Crystallization and phase transition boosted optical linear& nonlinear and magnetic properties in transparent xCu: BaSnO3 NCs/glass-ceramic","authors":"","doi":"10.1016/j.jeurceramsoc.2024.117034","DOIUrl":"10.1016/j.jeurceramsoc.2024.117034","url":null,"abstract":"<div><div>In this study, cubic xCu: BaSnO₃ (x = 0, 1, 3, and 5 mol%) perovskite nanocrystals were synthesized using a hydrothermal method. The influence of Cu doping levels on the crystal structure, morphology, size, and properties was analyzed using X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Raman, Ultraviolet-Visible Spectroscopy (UV–vis), Vibrating Sample Magnetometry (VSM), and X-ray Photoelectron Spectroscopy (XPS) techniques. Across the 1–5 % doping range, the cubic BaSnO₃ structure was maintained with Cu²⁺ in CuO₆ replacing Sn⁴⁺ in the B-site. XPS analysis confirmed the formation of oxygen vacancies due to charge imbalance, leading to a decrease in optical bandgap and an increase in ferromagnetic moment. When various contents of xCu: BaSnO₃ were doped into borosilicate glass, significant impacts on the glass network, crystallization, and properties were observed. Nanocrystals (∼50 nm) transitioned from cubic to orthorhombic phase beyond 3 mol% doping, modifying the glass network by converting BO₃ to BO₄, AlO₄ to AlO₆, and CuO₆ to CuO₄. This phase change endowed the glass's strong ferromagnetic moment and absorption due to the t_2 g→e_g transitions of Cu²⁺ in CuO₆, and reduced the optical bandgap from 3.16 to 2.2 eV. The glass also exhibited improved Vickers hardness (475 HV) and a high Verdet constant of 0.174 min/G·cm due to network modifications. Glass also shows a distinct red emission at 596 nm with a 160 µs lifetime and good thermal stability, while doping levels above 3 % resulted in emission quenching. The optical nonlinear absorption coefficient and nonlinear susceptibility increased with higher doping levels, reaching huge values of α₃: 5.12×10⁻¹⁰ m/W and χ⁽³⁾: 7.52×10⁻¹⁰ esu, indicating potential for self-focusing applications. The increased polarizability also resulted in a high dielectric constant (18) and a large P-E loop of glasses which are promising for advanced photonics devices.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":null,"pages":null},"PeriodicalIF":5.8,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593772","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}

{"title":"Significantly enhanced microwave-millimeterwave properties of cordierite ceramics: Roundness regulation of Si-Al hexagonal ring, analysis of far-infrared reflectance and terahertz time-domain spectroscopy","authors":"","doi":"10.1016/j.jeurceramsoc.2024.117045","DOIUrl":"10.1016/j.jeurceramsoc.2024.117045","url":null,"abstract":"<div><div>Ultra-low permittivity (<em>ε</em>_<em>r</em>：4–5) Mg₂Al_{4–<em>x</em>}(Ge_0.5Mg_0.5)_<em>x</em>Si₅O₁₈ (0.12 ≤ <em>x</em> ≤ 0.28) and Mg₂Al_{4–<em>y</em>}(Mn_0.5Mg_0.5)_<em>y</em>Si₅O₁₈ (0.1 ≤ <em>y</em> ≤ 0.3) cordierite ceramics were fabricated by solid-state reaction method. The improvement in [(Si₄Al₂)O₁₈] hexahedral ring roundness significantly enhances the quality factor through the substitution of complex ionic pairs of Ge_0.5Mg_0.5/Mn_0.5Mg_0.5 for Al lattice sites in the [(Si₄Al₂)O₁₈] hexahedral ring of these cordierite ceramics. Excellent microwave dielectric performances of Mg₂Al_3.8(Ge_0.5Mg_0.5)_0.2Si₅O₁₈ and Mg₂Al_3.8(Mn_0.5Mg_0.5)_0.2Si₅O₁₈ ceramics sintered at 1400 °C were demonstrated using the Hakki-Coleman resonant method with <em>ε</em>_<em>r</em> = 4.676, <em>Q×f</em> = 186, 503 [email protected] GHz and 199,476 GHz @ 27.434 GHz, <em>τ</em>_<em>f</em> = −20.02 ppm/°C and <em>ε</em>_<em>r</em> = 4.807, <em>Q×f</em> = 101,420 [email protected] GHz and 143,005 GHz @ 27.366 GHz, <em>τ</em>_<em>f</em> = −26.44 ppm/°C, respectively. These results present the potential application of high-quality cordierite in future B5G/6 G millimeter and terahertz communication frequency bands.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":null,"pages":null},"PeriodicalIF":5.8,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578409","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}

{"title":"Effect of MnO2 content on the growth and electric properties of <110>c-oriented 0.85(Bi0.5Na0.5)TiO3-0.15BaTiO3 single crystals fabricated by solid-state crystal growth method","authors":"","doi":"10.1016/j.jeurceramsoc.2024.117043","DOIUrl":"10.1016/j.jeurceramsoc.2024.117043","url":null,"abstract":"<div><div>&lt;110&gt;_c-oriented 0.85(Bi_0.5Na_0.5)TiO₃-0.15BaTiO₃ + x wt%MnO₂ (x = 0 – 0.5) single crystals were fabricated by a solid-state crystal growth method, and the effect of the MnO₂ content on crystal growth and electric properties were investigated. Single crystals with a size of about 2 mm×3 mm×0.4 mm were obtained at x = 0 – 0.1. The temperature dependence of the dielectric properties of the single crystals at x = 0 – 0.1 revealed depolarization temperatures of 218 – 220 ˚C and the temperatures of the maximum dielectric constant of 254 – 261 ˚C. At x = 0.1, a ferroelectric polarization – electric field loop and a strain – electric field curve were observed, and the piezoelectric constant d₃₃ was 118 pC/N. The d₃₃ value was larger than to that of reported &lt;110&gt;_c-oriented ceramics but smaller than &lt;001&gt;_c-oriented ceramics, which suggested that 0.85(Bi_0.5Na_0.5)TiO₃-0.15BaTiO₃ was an extender ferroelectric material.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":null,"pages":null},"PeriodicalIF":5.8,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586438","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}

{"title":"Temperature stable (1-x)BaAl2Si2O8-xBa3V2O8 (0.2 ≤ x ≤ 0.5) microwave dielectric composite ceramics for LTCC applications","authors":"","doi":"10.1016/j.jeurceramsoc.2024.117042","DOIUrl":"10.1016/j.jeurceramsoc.2024.117042","url":null,"abstract":"<div><div>BaAl₂Si₂O₈ microwave dielectric ceramics possess dielectric properties of low permittivity (<em>ε</em>_r) and low loss, coupled with low synthesis cost, making them promising for commercialization. However, the hexagonal structure undergoes high-temperature phase transitions that deteriorate thermal shock resistance and durability, hindering its practical use. In this work, we report temperature-stable BaAl₂Si₂O₈-Ba₃V₂O₈ low temperature co-fired ceramics (LTCC). The combination of Ba₃V₂O₈ and G9 glass achieved a near-zero <em>τ</em>_<em>f</em> and a thermal expansion coefficient of ∼ 8.5 ppm/℃, significantly enhancing the temperature stability of BaAl₂Si₂O₈ ceramics. By employing ion substitution and enhancing lattice disorder, the components of G9 glass were strategically designed to successfully induce hexagonal-to-monoclinic transformation of BaAl₂Si₂O₈ phase. The dielectric properties of 0.5BaAl₂Si₂O₈-0.5Ba₃V₂O₈-9 wt% G9 sintered at 900 ℃ were <em>ε</em>_r ∼9, <em>Q</em>×<em>f</em> ∼22,000 GHz and <em>τ</em>_<em>f</em> ∼ +1.9 ppm/℃. Good chemical compatibility with silver powders was confirmed by further investigation of the co-firing behavior. This work provides attractive candidate for BaAl₂Si₂O₈-based LTCCs and an available approach for modifying BaAl₂Si₂O₈ ceramics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":null,"pages":null},"PeriodicalIF":5.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561491","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}

{"title":"The ultra-low glasslike thermal conductivities of Y3+- and Ce4+- codoped lanthanum zirconate pyrochlores for potential thermal barrier coating applications","authors":"","doi":"10.1016/j.jeurceramsoc.2024.117038","DOIUrl":"10.1016/j.jeurceramsoc.2024.117038","url":null,"abstract":"<div><div>It is urgent to develop thermal barrier coating (TBC) topcoat materials with ultra-low thermal conductivities for next-generation gas turbine engines. A novel pyrochlore-based single-phased ceramic, tuned by codoping of lanthanum zirconate, (La_1-xY_x)₂(Zr_1-yCe_y)₂O₇, has been synthesized from the solid state reaction method. The thermal conductivity of (La_1-xY_x)₂(Zr_1-yCe_y)₂O₇ not only exhibits a temperature-independent trend but also reaches as low as 0.93 W·m⁻¹·K⁻¹, a value that is lowest of fully dense crystalline solids in open literature, attributing to the following two combined effects. The first is the strong scattering of phonons by small-sized Y³⁺ cations occupying the oversized atomic cages formed by the distinctive pyrochlore structure. The second is the lattice softening effects arising from larger-sized Ce⁴⁺ substituting Zr⁴⁺ cations. The above two effects act in concert and thus form a glasslike and ultra-low thermal conductivity of (La_1-xY_x)₂(Zr_1-yCe_y)₂O₇ solid solutions, which is ideal for next-generation TBC topcoat applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":null,"pages":null},"PeriodicalIF":5.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593280","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}

{"title":"Development of electrical discharge machinable SiC-ZrN composites: Unveiling high temperature sliding wear resistance","authors":"","doi":"10.1016/j.jeurceramsoc.2024.117040","DOIUrl":"10.1016/j.jeurceramsoc.2024.117040","url":null,"abstract":"<div><div>Dense SiC-(10-30 vol%) ZrN composites were developed using spark plasma sintering with AlN-Y₂O₃ additives at 1800 °C for 5 min in nitrogen atmosphere. The nascent oxide present on ZrN surface reduces liquid phase formation temperature, facilitating improved densification of SiC ceramics. Mechanical properties were retained, and electrical conductivity increased with ZrN addition. To demonstrate a rapid and low-cost machining alternative for SiC ceramics, SiC-ZrN composites were successfully cut using wire-EDM. The tribological potential of novel electrical discharge machinable SiC-ZrN composite disk against SiC ball at various conditions of reciprocating sliding contacts was investigated. Friction is less affected by reinforcement content at room temperature (25 ℃) but significant change is observed at high temperature (600 ℃). Minimum one order of lower wear rate is reported with an increase in temperature from 25 ℃ to 600 ℃. The major wear mechanism changed from abrasion to tribo oxidation with increase in temperature.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":null,"pages":null},"PeriodicalIF":5.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578410","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}

{"title":"High thermal sensitivity and dielectric constants in CaCu3Ti4O12-LaMn1-xFexO3 composite ceramics by designing sandwich and core-shell structure","authors":"","doi":"10.1016/j.jeurceramsoc.2024.117041","DOIUrl":"10.1016/j.jeurceramsoc.2024.117041","url":null,"abstract":"<div><div>In this work, a series of CaCu₃Ti₄O₁₂-LaMn_1-<em>x</em>Fe_<em>x</em>O₃ sandwich and core-shell structured ceramics were prepared by using the conventional solid-state method. For these structures, LaMn_1-<em>x</em>Fe_<em>x</em>O₃ is encapsulated by the CaCu₃Ti₄O₁₂ (CCTO) layer as a core and interlayer. These ceramics demonstrate high sensitivity with material constants (<em>B</em>) ranging from 7391 to 9786 K and temperature coefficients up to −7.03 %. In addition, Fe³⁺ doping optimizes the electronic structure of LaMnO₃ (LMO) and enhances the Jahn-Taylor coupling and charge localization, thus leading to an increase in the material constant. Furthermore, the core-shell ceramics of CCTO-LMO (Co-LMO) have a high dielectric constant of 16731 at 1 kHz, which exceeds that of the CCTO samples. This enhancement can be attributed to the increase in potential differences caused by the additional carriers. The proposed schemes in this work have important implications for regulating the thermal sensitivity and permittivity of CCTO-based multifunctional coupled electronics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":null,"pages":null},"PeriodicalIF":5.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572810","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}

{"title":"Influence of solid loading on microstructure evolution and thermal conductivity of aluminum nitride ceramics fabricated by digital light processing 3D printing","authors":"","doi":"10.1016/j.jeurceramsoc.2024.117028","DOIUrl":"10.1016/j.jeurceramsoc.2024.117028","url":null,"abstract":"<div><div>Efficient thermal management is essential to reduce hot spot temperature of high-power opto-electronic components and improve their working efficiency. In this work, AlN ceramics with high density and thermal conductivity properties were fabricated using a joint process of digital light processing (DLP) 3D printing and micro-pressure-assisted sintering method. Effects of solid loading on microstructure evolution and thermal properties of the ceramics were systematically discussed. AlN ceramic mini-channel heat sinks were designed and fabricated using the optimized DLP 3D printing and sintering parameters. The thermal management performances of the ceramic heat sinks were evaluated by investigating the optoelectronic property of the encapsulated laser diode module. Results indicated that the laser diode module could be long-timely operated at full driven power. This study provided a new strategy for fabricating high performance AlN ceramics with complex configurations and highlighted the technical potential of AlN ceramic heat sink with compact coolant channels.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":null,"pages":null},"PeriodicalIF":5.8,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554143","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}

{"title":"Fabrication and characterization of LuAG: Er ceramics with high optical transmission","authors":"","doi":"10.1016/j.jeurceramsoc.2024.117033","DOIUrl":"10.1016/j.jeurceramsoc.2024.117033","url":null,"abstract":"<div><div>Highly transparent ceramics based on LuAG with erbium content ranging from 1 to 50 at% were synthesized from powders prepared via chemical precipitation in an aqueous solution. The impact of hot isostatic pressing on the optical properties of these ceramics was investigated. It was demonstrated that employing hot isostatic pressing enhances the optical transmittance of LuAG:Er ceramics. The influence of erbium concentration on the average grain size of the ceramics was also examined. Additionally, temperature-dependent thermal diffusivity profiles of LuAG:Er ceramics as a function of erbium content were analyzed. Erbium concentrations yielding the highest luminescence intensity in spectral ranges around ∼1.5–1.6 μm and ∼2.7 μm were determined.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":null,"pages":null},"PeriodicalIF":5.8,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561492","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}