Article
Chemistry, Physical
Danjiang Deng, Muhammad Sultan Irshad, Xi Kong, Peter Panfilov, Letao Yang, Jinming Guo
Summary: Lead-free potassium sodium niobate (KNN)-based transparent ceramics were successfully fabricated by a conventional solid-state reaction method, showing high light transmission and excellent piezoelectric properties. By adjusting the phase structure and grain size, the ceramics maintained their good transparency and piezoelectricity. Particularly, KNLNST-based transparent ceramic with 0.07CZ modifications exhibited higher light transmittance (73.5% at 1800 nm) and exceptional piezoelectric constants (d33 = 130 pC/N), making it more efficient than reported KNN-based transparent ceramics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Changxiao Li, Yu Huan, Xiaozhi Wang, Xinjian Wang, Ting Wang, Tao Wei
Summary: This study successfully optimized the optical transmittance and energy storage characteristics of ceramics by modifying them with Bi(Li0.5Nb0.5)O-3 (BLN) known for its excellent optical transparency and energy storage properties. The newly synthesized 0.95KNN-0.05BLN ceramic exhibited excellent energy storage efficiency and transparency.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Hao-Cheng Thong, Alexis Payne, Jia-Wang Li, Yue-Yu-Shan Cheng, Jacob L. Jones, Ke Wang
Summary: The excellent piezoelectric properties of lead-free potassium sodium niobate (KNN) ceramics have been reported in the past 15 years, but the poor reproducibility of these properties has hindered industrial development due to a lack of understanding of processing aspects. Chemical inhomogeneity during processing is a critical challenge for KNN-based ceramics, as their properties are strongly dependent on composition. In this study, in-situ temperature-dependent X-ray diffraction and thermogravimetric analysis were used to investigate chemical reactions during solid-state synthesis, revealing that chemical homogeneity is sensitive to reactant competition, explaining the chemical inhomogeneity in KNN and other lead-free piezoelectric ceramic systems prepared via solid-state synthesis.
Article
Materials Science, Ceramics
Cerem Piskin, Levent Karacasulu, Gloria Ischia, Mauro Bortolotti, Cekdar Vakifahmetoglu
Summary: Single-phase KNN can be achieved through hydrothermal synthesis, and further incorporation of sodium ions into the crystal can be obtained by post-annealing, approaching the morphotropic phase boundary.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Kosuke Tsuji, Zhongming Fan, Sun Hwi Bang, Sinan Dursun, Susan Trolier-McKinstry, Clive A. Randall
Summary: In this study, Cold Sintering was applied to densify a Potassium-Sodium Niobate solid solution composition, resulting in ceramics with comparable dielectric and electrical properties as conventionally sintered KNN. TEM analysis revealed high density of line defects in grains and crystalline grain boundaries with faceted kinks, which limit the piezoelectric properties and hysteresis of the ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Ye Zhao, Jinhua Du, Junlin Yang, Lipeng Zhu, Yanyu Wang, Yong Li, Xihong Hao
Summary: In this study, a large room-temperature electrocaloric response is achieved through the relaxor enhancement effect and multilayer ceramic construct. The addition of CaZrO3 breaks the long-range order, enhancing the temperature change (△T) and widening the temperature span (T-span) at room temperature. The multilayer ceramic construct improves the breakdown electric field (E-b) by reducing defects and leads to a higher △T.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Ceramics
Min Li, Jin Luo, Tao Zhang, Yunfei Liu, Yinong Lyu
Summary: In this study, (0.95-x)K0.48Na0.52NbO3-0.05SrTiO(3)-xCaZrO(3) piezoelectric ceramics were prepared and their microstructures, phase structures, and ferroelectric, dielectric, and strain properties were investigated. The crystal structure of the ceramics changed from orthogonal-tetragonal coexistence to tetragonal-orthogonal coexistence by improving the transition temperature with increasing CaZrO3 doping. These materials exhibited a high electric field-induced strain and excellent ferroelectric and dielectric properties, making them promising candidates for lead-free ceramics in the future.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Patricia Pop-Ghe, Monika Amundsen, Christiane Zamponi, Anette Gunnaes, Eckhard Quandt
Summary: Temperature-dependent X-ray diffraction and transmission electron microscopy were used in this study to investigate the first-order phase transitions of ferroelectric K0.5Na0.5NbO3. The results revealed that the phase transitions in this ceramic are multi-step processes, featuring an intermediate twinning stage. Perovskite-type ceramics can be considered as model systems for displacive transformations, and the experiments presented here provide insight into nucleation, propagation path, and twinning mechanisms in ceramic materials.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Yue-Yu-Shan Cheng, Lisha Liu, Yu Huang, Liang Shu, Yi-Xuan Liu, Liyu Wei, Jing-Feng Li
Summary: Flexible lead-free (K, Na)NbO3 (KNN)-based piezoelectric thin films were directly fabricated on commercially available metallic foils through sol-gel processing, showing good flexibility and high breakdown electric fields. The flexible thin films on platinum exhibited slightly decreased effective piezoelectric coefficient after bending, but still maintained high overall performance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Inorganic & Nuclear
Lucile Vaschalde, Encarnacion G. Villora, Kiyoshi Shimamura
Summary: This study successfully prepared high-density and stable undoped KNN ceramics using an optimized low-temperature sintering process. It was found that the best performance can be achieved in K >= 40% compositions, contrary to previous assumptions. The results of this study demonstrate that the preparation process is the main factor for achieving high-performance undoped KNN ceramics.
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Ceramics
Ronglian Li, Guoxiang Zhang, Yuesong Li, Ping Zhao, Qi Sun, Yuanyu Wang
Summary: In this study, CuO, Fe2O3, ZnO, and Al2O3 were doped into potassium-sodium niobate (KNN) to investigate their effects on the breakdown strength (EB). The results showed that the addition of oxides increased the EB to some extent, with ZnO having the most significant improvement. Experimental and analytical findings indicated that doping Fe2O3, ZnO, and Al2O3 could enhance the relative density, dielectric constant, and activation energy of the ceramics.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Vajihe Amoozegar, Zahra Sherafat, Elham Bagherzadeh
Summary: The research focused on fabricating ternary composites of PVDF/KNN/SiC and studying the effects of additives on the electrical properties. SiC addition altered the primary crystalline structure of PVDF, significantly enhancing the piezoelectric properties. However, excessive SiC content could reduce the material's performance.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Ziyu Ma, Huijing Zheng, Lin Zhao, Bo Wu, Hong Tao, Min Chen, Jian Ma
Summary: This study compares the influence of different additives on phase transition temperatures in potassium sodium niobate ceramics, revealing the intrinsic essence of structure evolution and its impact on electrical properties. The study also determines the order of influence on phase boundary formation by additives and finds that BAZ and BZ additives are more effective compared to Sb5+.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Zhenyong Cen, Fuzhi Cao, Meiyi Feng, Ziting Li, Ze Xu, Gengguang Luo, Nengneng Luo, Kaizhong Xie, Longtu Li, Xiaohui Wang
Summary: Piezoelectric strain and temperature stability of KNN-based ceramics sintered in reducing atmosphere are simultaneously improved through defects design of Mn doping. MnO and MnO2 impact the defects in KNN-based ceramics. Switchable defect dipoles in the ceramics enhance the reversibility of the non-180° domains switching and significantly improve the piezoelectric strain. The stable defect dipoles preserve the reversibility of the non-180° domains switching at high temperature, achieving large piezoelectric strain and excellent temperature stability.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Yining Xie, Jie Xing, Zhi Tan, Lixu Xie, Yuan Cheng, Xiaojun Wu, Ruilin Han, Qiang Chen, Jianguo Zhu
Summary: Research has been conducted to enhance the piezoelectricity of KNN ceramics as a more eco-friendly alternative to PZT. However, high-performance KNN ceramics often suffer from low mechanical quality factors, leading to excessive dielectric loss. This study successfully improves the mechanical quality factor of KNN ceramics by constructing phase boundaries and inducing oxygen vacancies, resulting in ceramics with high Qm, high piezoelectric performance, and outstanding temperature stability.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Licheng Zheng, Kai Jiang, Jiaren Du, Yike Li, Zhongjun Li, Hengwei Lin
Summary: A facile strategy was developed to prepare color-controllable room-temperature phosphorescence (RTP) materials through the pyrolysis of a mixture containing 1-(2-hydroxyethyl)urea and boric acid. By controlling the pyrolysis temperatures, the resulting materials exhibited ultralong RTP with tunable emission colors. The study also revealed the formation of multiple luminescent centers, in-situ embedded in the B2O3 matrix, by the pyrolysis process, allowing for color-tunable RTP.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Tengyue Wang, Jiaren Du, Xiaomeng Wang, Kai Jiang, Panqin Wang, Shaoxing Lyu, Hengwei Lin
Summary: Rare earth-doped luminescent materials have wide applications in scientific research and practical use. The design of a single matrix containing multiple emitting centers is a trend in the development of luminescent materials. This study reports the design of a smart platform combining trivalent bismuth and lanthanides ions in a LuNbO4 matrix, which demonstrates multiple stimuli-responsiveness and color-tunability. The possible application of color-changeable indicators for information readouts is demonstrated, showing promise in various fields.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Materials Science, Multidisciplinary
Zetian Yang, Jonas J. Joos, Jieqi Hu, David van der Heggen, Tim Pier, Maxime Delaey, Henk Vrielinck, Thomas Justel, Philippe F. Smet, Dirk Poelman
Summary: This study demonstrates a design approach for wavelength-specific light dosimeters based on photo-induced redox processes of certain lanthanides in phosphate compounds, enabling selective monitoring of UV and visible light doses. The reduction process is induced through ligand-to-metal charge transfer excitation, while the oxidation process is achieved through excitation of the involved hole traps or 4f(N)-4f(N-1)5d(1) transitions of the created divalent dopants. The dose and wavelength-dependent redox processes allow for tailored spectral sensitivity of the dosimeter, making it suitable for personal solar UV radiation monitoring.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yifan Song, Jiaren Du, Rujun Yang, Cunjian Lin, Wenjing Chen, Zishuang Wu, Hengwei Lin, Xi Chen, Yixi Zhuang, Rong-Jun Xie
Summary: Time-temperature indicator (TTI) technologies provide nondestructive and real-time quality management for perishable products, ensuring product safety. However, current TTI technologies have limitations in recyclability, sensitivity, and environmental tolerance. This study proposes a new TTI route based on the light storage effect in persistent luminescent (PersL) materials, showing excellent recyclability, reliability, and environmental stability. It highlights the potential of PersL phosphors in advanced TTI applications and next-generation biological detection technology.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jiaren Du, Shaoxing Lyu, Panqin Wang, Tengyue Wang, Hengwei Lin
Summary: This study reports a single-rare-earth-doped phosphor, Sr2YGaO5:Sm3+, with multi-responsive luminescence, which exhibits unique luminescent features under different excitation conditions. The multimode-responsive luminescence of Sr2YGaO5:Sm3+ is attributed to the superior optical integration of the host (Sr2YGaO5) and dopant (Sm3+) emissions under specific stimulation conditions. This study provides a novel concept for designing inorganic phosphor-based multifunctional optical materials and contributes to the development of smart platforms.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Nithin Poonkottil, Hannes Rijckaert, Khannan Rajendran, Robin R. Petit, Lisa I. D. J. Martin, Dries Van Thourhout, Isabel Van Driessche, Christophe Detavernier, Jolien Dendooven
Summary: This article explores the method of area selective atomic layer deposition (AS-ALD) using methanol and RuO4 as reactants to achieve continuous deposition of RuO2 on SiO2 while no deposition occurs on PMMA. The process demonstrates excellent selectivity at deposition temperatures as low as 60 degrees C. The study also reveals the relationship between polymer structure and the applicability of different polymer thin films as mask layers. Finally, the method is demonstrated by selectively depositing RuO2 on patterned SiO2/PMMA samples, resulting in RuO2 nanopatterns after PMMA removal.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Hooman Pazhand, Ali Asghar Sabbagh Alvani, Hassan Sameie, Reza Salimi, Dirk Poelman
Summary: In this research, the controllable synthesis of Metal-organic frameworks (MOFs) with well-defined morphology, composition, and size was studied for understanding their structure-property relationship in various applications. The effect of photocatalyst morphology on optical behavior and photocatalytic efficiency was investigated using physical synthetic parameters for methylene blue removal. The empirical data showed that the particles synthesized at 120 degrees C using iron chloride exhibited the highest efficiency, which can be considered for future research in wastewater treatment.
Article
Chemistry, Physical
Jiawei Hu, Hilde Poelman, Stavros-Alexandros Theofanidis, Jonas J. Joos, Christophe Detavernier, Dirk Poelman, Wei Wei, Vladimir V. Galvita
Summary: CCLHGD is a new hot gas desulfurization method that utilizes alternating sulfuration and regeneration processes to remove H2S. Fe2O3 is gradually converted into iron sulfides by H2S, and it can be fully regenerated to iron oxides by CO2. This work provides an efficient chemical looping scheme for H2S removal and offers new opportunities for hot gas desulfurization.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Xiaomeng Wang, Panqin Wang, Jiaping Zhang, Qianqian Ma, Qingpo Liu, Rik Van Deun, Hengwei Lin, Jiaren Du
Summary: Persistent luminescence (PersL) materials, such as MgGa2O4: Mn2+, have been successfully synthesized via a facile microwave-assisted solid state (MASS) method. This method allows for the preparation of multi-aperture cluster-like samples with smaller particle sizes, resulting in the unlocked PersL feature. The phosphors show promise for night vision and information storage applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Jiaren Du, Jiaping Zhang, Tengyue Wang, Pengshang Zhou, Lejia Cao, Qingpo Liu, Hengwei Lin
Summary: A highly bright inorganic phosphor with high initial afterglow brightness has been reported. The aggregation of charge carriers at shallow-trap energy levels contributes to the enhanced brightness. The findings have the potential to advance the development of high-brightness persistent luminescent materials for glow-in-the-dark applications.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Chunhui Liu, Anna M. Kaczmarek, Himanshu Sekhar Jena, Zetian Yang, Dirk Poelman, Pascal van der Voort
Summary: Recent research in lanthanide materials has contributed to the development of chemical sensors, but the current sensors still have limited detection range. We developed lanthanide-based hollow spheres for luminescence turn-off sensing of Hg2+ with low detection limit and wide detection range. This hybrid material exhibited both downshifting and upconversion luminescence.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Xiaomeng Wang, Jiaren Du, Hengwei Lin
Summary: Near-infrared persistent luminescence (NIR PersL) materials have great potential in night vision, biological imaging, and information encryption. This study investigates a series of Gd3MgxGexGa5-2xO12:Cr3+ materials prepared by microwave-assisted solid-state approach and demonstrates the improvement of PersL performance through chemical composition co-substitution. The study also reveals the trap level distribution of Gd3Mg0.5Ge0.5Ga4O12:Cr3+ phosphor and suggests that bandgap reduction and trap distribution optimization facilitate NIR PersL in Cr3+-doped gadolinium gallium garnets.
Article
Chemistry, Multidisciplinary
Panqin Wang, Jiaren Du, Tengyue Wang, Shaoxing Lyu, Rik Van Deun, Dirk Poelman, Hengwei Lin
Summary: This research overcomes the limitations of traditional methods for evaluating the inhomogeneity of thermal fields by developing a thermochromic smart material, SrGa12-xAlxO19:Dy3+. It allows flexible visualization of temperature inhomogeneities and exhibits abundant colors and amazing color-changing features. This thermo-responsive smart material can achieve highly efficient and simple visualization of invisible thermal distribution in industry and beyond.
MATERIALS HORIZONS
(2023)
Article
Materials Science, Ceramics
Dan Zhao, Yi Feng, Zhipeng Pi, Fan Zhang
Summary: Phase equilibria in the ZrO2-GdO1.5-TaO2.5 (ZGTO) system were experimentally investigated, and the differences between ZGTO and the existing ZrO2-YO1.5-TaO2.5 (ZYTO) were discussed. The study is useful for thermodynamic assessment of ZGTO and can guide the design of novel thermal barrier coatings materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yutaka Ohya, Wingki Mey Hendra, Chika Takai-Yamashita, Takayuki Ban
Summary: Diffusion couples of rutile and corundum single crystals were prepared and examined to study the solid solution and precipitation of corundum in rutile during cooling. Different precipitation forms of corundum were observed under different cooling conditions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiaming Zhan, Yunfa Guo, Hao Wang
Summary: This study systematically investigates the mechanical behaviors of calcium fluoride in humid environments. The effects of water on the deformation and plastic enhancement of CaF2 under indentation are explored through microindentation experiments, atomic simulations, and Raman spectroscopy measurement.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hangfeng Zhang, Henry Giddens, Theo Graves Saunders, Matteo Palma, Isaac Abrahams, Haixue Yan, Yang Hao
Summary: The relationship between low and high frequency tunabilities in tin substituted barium titanate ceramics was investigated. It was found that there are differences in tunabilities at different frequencies due to the different activities of larger ferroelectric domains and polar nanoclusters.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Kaibiao Xi, Jiacheng Liu, Beibei Song, Huarong Cheng, Yihao Li, Xiaole Yu, Mupeng Zheng, Mankang Zhu, Yudong Hou
Summary: Composite modulation in the superparaelectric state of the BTBZ-CT system is proposed as an effective strategy to achieve both NTCC and excellent energy storage performance in dielectric ceramics. The addition of BZ and CT to BT ferroelectrics can move the SPE state to the normal use temperature zone, resulting in enhanced NTCC characteristics and energy storage performance. Furthermore, intentional precipitation of CT at grain boundaries can refine the grain size, increase the bandgap, and strengthen the local electric field distribution, thereby enhancing the breakdown electric field.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hamed Salimkhani, Lovro Fulanovic, Till Froemling
Summary: The demand for robust multilayer ceramic capacitors with high-temperature and high-power capabilities is increasing rapidly. However, cost-effective production is a challenge. This study investigates the use of Na0.5Bi0.5TiO3-based materials as promising lead-free options. By adding sintering aids, the sintering temperature of Na0.5Bi0.5TiO3-BaTiO3-CaZrO3-BiAlO3 solid solutions was successfully reduced to 975 degrees C, suitable for co-sintering with Cu electrodes without adverse effects on capacitor properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Mingxing Li, Ran Mo, Zeshui Xu, Jie Zhou, Conglin Zhang, Xuefeng Cui, Fang Ye, Laifei Cheng, Ralf Riedel
Summary: Polymer infiltration and pyrolysis is an effective method for preparing ceramic matrix composites. The transformation of polymer to ceramic during the process affects the residual stress and interface behavior in the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yan Kang, Lin Chen, Chang-Jiu Li, Guan-Jun Yang
Summary: A novel abradable seal coating with low hardness and high bonding strength was successfully designed and prepared. This coating has significantly higher abradability and erosion resistance compared to metal-based coatings, and can retain excellent abradability and have a long lifetime during service.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Qingzhong Song, Xiangdong Zha, Ming Gao, Yingche Ma
Summary: This study analyzes the influence of calcia refractory purity on the properties of calcia crucibles. Higher purity calcia results in well-developed grains and improved hydration resistance, leading to better high-temperature strength and thermal shock resistance. In contrast, lower purity calcia crucibles exhibit inferior properties. Therefore, high-purity calcia is considered a potential refractory for manufacturing oxide crucibles.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sehreish Abrar, Faisal Nazeer, Zhuang Ma, Ling Liu, Abdul Malik, Mustafa Kamal, Abdullah G. Al-Sehemi
Summary: To raise the operating temperature of Si-based ceramic matrix composites (CMCs), researchers have applied thermal/environmental barrier coating (T/EBCs) materials, typically rare earth silicates. However, the high thermal conductivity and the mismatch of thermal expansion have been major challenges in developing new materials that can offer thermal insulation and environmental protection to CMCs. In this study, entropy engineering was used to create a multicomponent equi-atomic single-phase pyro silicate with extremely low thermal conductivity and enhanced water vapor corrosion resistance. The research findings show the potential of high entropy disilicates in achieving ultra-low thermal conductivity and low weight loss in corrosive environments.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zi-bo Niu, Daxin Li, Dechang Jia, Zhihua Yang, Kunpeng Lin, Paolo Colombo, Ralf Riedel, Yu Zhou
Summary: In this study, SiBCN ceramics with a special structure were prepared to improve the oxidation resistance. The effect of the structure on oxidation behavior and kinetics was investigated, revealing that the special structure can effectively inhibit heterogeneous oxidation and enhance the oxide layer composition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Melike Donmez, Metehan Erdogan, Cihangir Duran
Summary: The limited densification of CeO2 ceramics was improved by using an anorthite-based glass, resulting in high dielectric constant and quality factor with minimum dielectric loss. The CeO2-(anorthite-based) glass ceramic showed promising results in terms of low temperature densification and microwave properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
S. Rahmati, R. G. A. Veiga, J. Mostaghimi, T. Coyle, A. Dolatabadi
Summary: This study provides an atomic-scale description of the high-velocity impact of alpha-Al2O3 particles onto an alpha-Al2O3 substrate during Aerosol Deposition (AD). The results suggest that the crystal orientation plays a crucial role in both plasticity and damage of the nanoparticles. Impact velocity has a direct correlation with plasticity and fragmentation, but adhesion efficiency has only a marginal increase. The crucial element lies in the substrate's surface alterations caused by the fragments left on the substrate after impact.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Bo-Wen Chen, Yan-Mei Kan, De-Wei Ni, Chun-Jing Liao, Hong-Da Wang, Yu-Sheng Ding, Shao-Ming Dong
Summary: This study characterized the long-term and repeated ablation properties of modified Cf/HfC-SiC composites with YB4-Al2O3-Si3N4 under an air plasma torch. The structural stability and viscosity of the oxide layer were found to affect the ablation resistance of the composites. By forming nano c-HfO2 grains and high-viscosity Al-Si-Y-O glassy phase, the structural stability of the oxide layer was improved, resulting in enhanced ablation resistance. However, the oxidation of Si3N4 led to the formation of NO, NO2, and excessive SiO2 glassy phase, which resulted in a porous structure and reduced the viscosity of the oxide layer. Therefore, the addition of Si3N4 decreased the ablation resistance of the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yongxing Wei, Huawei Zhang, Siyuan Dong, Changqing Jin, Chenxing Bai, Junle Dai, Zengzhe Xi, Zhonghua Dai, Zengyun Jian, Li Jin
Summary: In this study, solid solutions of xBi(Ni1/2Hf1/2)O-3-(1 - x)PbTiO3 (xBNH-PT) were synthesized to investigate their phase boundary behaviors and physical properties. The presence of a tetragonal-pseudocubic phase boundary and a spontaneous ferroelectric-relaxor transition at specific compositions were confirmed. The introduction of a tetragonal-pseudocubic phase boundary improved the piezoelectric properties and suppressed the spontaneous ferroelectric-relaxor transition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
