Article
Engineering, Electrical & Electronic
Sapna Kumari, Amit Kumar, V. Kumar, S. K. Dubey, P. K. Goyal, Suresh Kumar, A. L. Sharma, Anil Arya
Summary: In this study, perovskite-type lead-free ceramics were synthesized via solid-state reaction method with different doping elements. The effects of CuO and Bi2O3/CuO doping on structural, dielectric, and ferroelectric properties were investigated systematically. Doping was found to increase the activation energy and shift the phase transition temperatures in the ceramics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Ceramics
Chen Liu, Ji Zou, Xinwei Wang, Jon Binner, Tailin Zhang, Guoyang Ye, Tim Button
Summary: An optimized processing route was developed to fabricate dense and flat BCZT-L ceramics with 0-10 mol% of Li2CO3, using sintering at 1300°C-1400°C. The distribution of Li in the BCZT matrix was observed through TOF-SIMS, and the chemical and structural evolution of BCZT-L ceramics during sintering were comprehensively documented. It was found that the initial increase in d33 and kp of BCZT-L with Li content was followed by a decrease with excess Li, which was associated with Li aggregation in the BCZT matrix.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Fangbin Wei, Leiyang Zhang, Ruiyi Jing, Qingyuan Hu, D. O. Alikin, Y. Ya Shur, Jie Zhang, Xu Lu, Yangxi Yan, Hongliang Du, Xiaoyong Wei, Li Jin
Summary: In this study, environmentally friendly Bi-substituted BCZT ferroelectric ceramics were prepared and their dielectric, electrostrictive, and electrocaloric properties were investigated. The results showed that increasing the Bi3+ content resulted in changes in the ceramics' dielectric properties, as well as their electrostrictive and electrocaloric performance.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Wen Wang, Yangbin Ma, Ruiyi Jing, Wenjing Shi, Vladimir Shur, Xiaoyong Wei, Li Jin
Summary: This study investigates the defect dipole-assisted pinning effect in Mn-substituted BCZT ceramics. The results show that Mn dopants combined with oxygen vacancies form defect dipoles, enabling a precise establishment of the pinning effect. This study provides valuable insights into doping effects in other lead-free ferroelectrics.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
H. N. Li, J. H. Li, Y. C. Shi, B. H. Zhang, L. Lin, R. Liu, S. J. Wu, X. F. Li, J. Shang, Y. C. Hu, X. W. Wang
Summary: A series of BCZT-xNi ceramics were prepared by the sol-gel method. The doping of Ni resulted in a decrease in average grain size and changes in dielectric and ferroelectric properties. The sample with x = 0.01 showed high dielectric constant and good frequency stability, while the sample with x = 0.02 exhibited high energy density and energy efficiency. Cation replacement was found to be an effective way to adjust the properties of BCZT ceramics.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Physics, Condensed Matter
U. Ravikiran, P. Sarah, A. R. James, Elizabeth Zacharias
Summary: The manuscript presents a systematic study on the ferroelectric, piezoelectric, and conduction behavior of Sr, Na substituted Strontium Bismuth Titanate ceramics. The results showed improved ferroelectric properties, high piezoelectric constant, and a mechanism of conduction through short-range oxygen vacancies hopping. These ceramics have potential applications in a wide range of sensor, actuator, and transducer applications.
SOLID STATE COMMUNICATIONS
(2021)
Article
Materials Science, Ceramics
Sun Wenjing, Junzhan Zhang, Siyu Ge, Peng Shi, Leilei Li, Ying Zhang, Hudie Yuan, Dongyun Gui, Zongmo Shi
Summary: The influence of solid content on the pore morphology and mechanical and piezoelectric properties of porous BCZT ceramics was systematically investigated. The results showed that an increase in solid content led to a decrease in porosity and pore size, an increase in ceramic connectivity, and an increase in compressive strength. The best ferroelectric performance was achieved at a solid content of 30%, while the relative dielectric constant and piezoelectric constant increased with an increase in solid content. At a solid content of 20%, the maximum values of g33 and FOM33 were obtained.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Xinjian Wang, Yu Huan, Yixuan Zhu, Peng Zhang, Wenlong Yang, Peng Li, Tao Wei, Longtu Li, Xiaohui Wang
Summary: In this study, the intrinsic conduction mechanism and optimal sintering atmosphere of (Ba0.85Ca0.15)(Zr0.1Ti0.9)O-3 (BCZT) ceramics were regulated by Mn-doping element. The undoped ceramics exhibited best electrical properties in O-2, while the Mn-doped ceramics sintered in N2 showed the highest insulation resistance and best piezoelectric properties.
JOURNAL OF ADVANCED CERAMICS
(2022)
Review
Materials Science, Multidisciplinary
Ritesh Verma, Ankush Chauhan, Khalid Mujasam Batoo, Rohit Jasrotia, Anand Sharma, Rajesh Kumar, Muhammad Hadi, Emad H. Raslan, Joselito Puzon Labis, Ahamad Imran
Summary: BCZT is a promising lead-free ceramic material with superior electrical properties, exhibiting morphotropic and polymorphic phase transitions that contribute to its exceptional piezoelectric and ferroelectric properties. It has a high piezoelectric constant and large remnant polarization, along with a high Curie temperature, making it fascinating for use in the electrical world. The study examines the effect of doping on the modification of electrical properties through changes in phase transition temperature, structural modification, and bulk formation.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Shengfang Shi, Hideki Hashimoto, Tohru Sekino
Summary: Lead-free BCZT ceramics were greatly optimized in piezoelectric properties by doping Co ions, with Co2+ and Co3+ playing different roles in enhancing the properties. The content ratio Co3+/Co2+ was found to be correlated with piezoelectric performance, with ceramics containing 0.10 wt% of Co ion showing the best performance.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Daniel Drdlik, Dominik Zeman, Pavel Tofel, Zdenek Chlup, Hynek Hadraba, Katarina Drdlikova
Summary: The study investigates the correlation of different piezoelectric measurement methods on various material states, finding that ceramic powder treatment by ball milling and EPD technique can lead to thick and dense deposits. The results show that after sintering, BCZT ceramics can achieve high relative density, hardness, and piezoelectric coefficients.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Chuang Zhou, Wei Cai, Xue Yang, Qianwei Zhang, Dakai Chen, Yaohan Wang, Rui Huang, Mingchao Du, Rongli Gao, Gang Chen, Xiaoling Deng, Zhenhua Wang, Xiang Lei, Chunlin Fu
Summary: Submicron grain-sized (K,Na)NbO3 - x at.% Tm2O3 (KNNTx) piezoelectric ceramics were successfully prepared by solid-state method combined with microwave sintering. The introduction of Tm3+ doping results in the transformation of KNNTx ceramics from orthorhombic phase to the coexistence of orthorhombic and tetragonal phases, leading to the deterioration of ferroelectricity and enhancement of piezoelectricity due to the refined grain structure.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Wenchuan Li, Heng Wu, Hong Ao, Zhixin Zeng, Rongli Gao, Wei Cai, Chunlin Fu, Xiaoling Deng, Gang Chen, Zhenhua Wang, Xiang Lei
Summary: The microstructure, dielectric, ferroelectric, magnetic, and multiferroic properties of multiferroic composite ceramics were investigated. Different samples with different x values showed varying properties, with potential applications in the field.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Ceramics
Shengfang Shi, Hideki Hashimoto, Tohru Sekino
Summary: The two-step sintering method was investigated to enhance the piezoelectric properties of lead-free BCZT ceramics. The effect of calcination and sintering conditions on grain size and performance was discussed. Results showed that increasing calcination and first-step sintering temperatures led to larger grain size, which improved piezoelectric properties through lattice distortion, larger domains, and easy domain wall motion. Optimal performance was achieved with BCZT ceramics calcined at 1200°C, sintered at 1540°C (without holding), cooled to 1400°C, and held at 1400°C for 4 h, exhibiting the highest remnant polarization (Pr), largest piezoelectric constant (d33), and highest Curie temperature (Tc).
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Harvey Amorin, Michel Venet, Eva Chinarro, Pablo Ramos, Miguel Alguero, Alicia Castro
Summary: This study focuses on the application of high-energy milling for the mechanosynthesis of nanocrystalline Ba0.85Ca0.15Zr0.1Ti0.9O3 powders and the control of grain growth during ceramic processing. It also investigates a new mechanism for very large strain under electric field in fine-grained ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Engineering, Electrical & Electronic
T. Durga Rao, Sudharshan Vadnala, Bhumireddi Sattibabu, Saket Asthana
Summary: The study found that the magnetic properties of Ho and Sc substituted BiFeO3 compounds exhibited significant changes, including normal and inverse magnetocaloric effects, with a second-order magnetic transition observed at low temperatures.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Energy & Fuels
Venkata Seshaiah Katta, Aparajita Das, Reshma K. Dileep, Goutham Cilaveni, Supriya Pulipaka, Ganapathy Veerappan, Easwaramoorthi Ramasamy, Praveen Meduri, Saket Asthana, Deepa Melepurath, Sai Santosh Kumar Raavi
Summary: This study presents a comprehensive investigation on composition-dependent Neodymium doped Titania as photoanodes for solar energy conversion devices, and finds that Nd (0.4 mol%)-TiO2 performs well across all types of devices. Enhanced photo-conversion efficiencies were achieved for QDSC and DSSC, as well as improved photocurrent densities for PEC water splitting, highlighting the universal applicability of 0.4% Nd-doped TiO2.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Materials Science, Multidisciplinary
Sushil Misra, Sergey I. Andronenko, Parth Padia, Sudharshan Vadnala, Saket Asthana
Summary: The study investigated the thermal stability and magnetic properties of different Eu-Sr manganites, revealing that they exhibit ferromagnetic behavior with decreasing transition temperature as the Eu content increases. The ferromagnetic resonance lines appeared above the respective T-C in these samples, while the Nd-doped sample exhibited a monotonically decreasing linewidth with temperature.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Abhinav Kumar, Saket Asthana
Summary: Recent research has shown that introducing rare earth holmium (Ho3+) substitution in sodium bismuth titanate (NBT) can enhance the relaxor properties of dielectric ceramics, providing them with stable dielectric values at high temperatures suitable for energy storage applications and high temperature device applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Cilaveni Goutham, Kinjarapu Venkata Ashok Kumar, Sai Santosh Kumar Raavi, Challapalli Subrahmanyam, Saket Asthana
Summary: This paper focuses on the analysis of the microstructure phase of titanium dioxide (TiO2) precursor in sodium bismuth titanate (Na0.5Bi0.5TiO3, NBT) ceramics and compares the effects of anatase and rutile TiO2 on the grain size, microstructure, crystal structure, and electrical properties of NBT ceramics. The results show that NBT ceramics prepared with anatase TiO2 exhibit superior dielectric and ferro/piezoelectric properties, as well as additional photocatalytic functionality.
JOURNAL OF MATERIOMICS
(2022)
Article
Chemistry, Physical
Krishnarjun Banerjee, Saket Asthana
Summary: This study investigates the dependence of the P-E loop area on the electric field amplitude in lead-free ferroelectric materials, and explores the variation of energy storage density with electric field amplitude. The results show that the shape of the P-E loop has an impact on the energy storage density, and different shapes exhibit different trends in variation.
JOURNAL OF MATERIOMICS
(2022)
Article
Chemistry, Physical
Munendra Pal, Adiraj Srinivas, Saket Asthana
Summary: Lead-free magnetoelectric particulate composites were successfully synthesized using the solid-state sintering technique, and the coexistence of piezoelectric and ferromagnetic phases was confirmed. These composites showed excellent magnetoelectric coupling properties and dielectric characteristics, demonstrating potential for applications in magneto-dielectric devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Krishnarjun Banerjee, Nishant Singh, Saket Asthana
Summary: By completely replacing the Ti4+ of Na0.5Bi0.5TiO3 with (Mg1/3Nb2/3)4+, the dielectric breakdown strength of the lead-free Na0.5Bi0.5(Mg1/3Nb2/3)O-3 is enhanced and its electrocaloric effect can be observed. The material exhibits high EC strength and low leakage current at room temperature, making it suitable for solid-state refrigeration.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Physics, Condensed Matter
Abhinav Kumar, T. Durga Rao, Venkata Seshaiah Katta, Sai Santosh Kumar Raavi, Saket Asthana
Summary: This study investigates the complex impedance and photoluminescence properties of Sodium Bismuth Titanate (Na0.5 Bi(1-x) HoxTiO3, where x = 0, 0.5, 1, 2, and 3 mol %). The Nyquist plots show a semicircle in the higher temperature regime, confirming Debye type relaxation. The grain resistance decreases with temperature. In addition, a small concentration (0.5 mol %) of holmium substituted NBT exhibits improved insulating character, while photoluminescence emission peaks associated with Ho3+ ion transitions are observed in the visible range.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Chemistry, Physical
Abhinav Kumar, Saket Asthana
Summary: The Nb5+ substituted modification improved the relaxor characteristics and physical properties of lead-free sodium bismuth titanate. The modified material exhibited higher recoverable energy storage density at an electric field of 85 kV/cm. It demonstrated Debye-type behavior and negative temperature coefficient of resistance at higher temperatures, making it suitable for high-temperature dielectric applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Ranjan Kumar Sahu, Saket Asthana
Summary: Eco-friendly lead-free polycrystalline Na0.5-x KxBi0.5TiO3 (x = 0.30,0.35,0.40,0.45) series were synthesized by the solid-state reaction method with site-specific substitution of K-ion. The x = 0.30 composition exhibited enhanced relaxor nature, higher dielectric constant, increased Tm value, and improved breakdown strength with an increase in potassium concentration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Agricultural Engineering
M. Umamaheswara Rao, Divakar Singh, K. V. S. S. Bhargavi, Ranjan Kumar Sahu, Saket Asthana, Ch. Subrahmanyam
Summary: Biogas, a renewable energy produced from the anaerobic decomposition of plants and animals, contains methane, carbon dioxide, and trace amounts of hydrogen sulfide. This study focuses on the influence of hydrogen sulfide on the conversion of methane and carbon dioxide during syngas production. The effects of applied voltage and different dielectric materials on biogas reforming reaction were investigated using a dielectric barrier discharge non-thermal plasma reactor. It was observed that hydrogen sulfide significantly affects the conversion, with methane conversion dropping from 23% to 9% and carbon dioxide conversion dropping from 18% to 11% in the presence of hydrogen sulfide.
BIOMASS & BIOENERGY
(2023)
Article
Engineering, Electrical & Electronic
Ranjan Kumar Sahu, Krishnarjun Banerjee, Saket Asthana
Summary: The scaling behavior of room temperature ferroelectric hysteresis and switching current curves for lead-free and eco-friendly K+1 rich NBT (Na0.5Bi0.5TiO3) -based compositions was examined in this study. The logarithmic scaling behavior between the hysteresis area and the amplitude (E-0) of the field evolved in three regions for all compositions. The domain dynamic behavior in different regions was revealed using a power scaling law.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Proceedings Paper
Materials Science, Multidisciplinary
Abhinav Kumar, Saket Asthana
Summary: Substitution of a small amount (0.5 mol%) of holmium ion (Ho+3) in sodium bismuth titanate (NBT) has been shown to improve electrical properties and insulating nature, leading to lower leakage current density and higher electromechanical coupling coefficient.
MATERIALS TODAY-PROCEEDINGS
(2021)
Proceedings Paper
Materials Science, Multidisciplinary
T. Durga Rao, Arpita Mishra, Bhumireddi Sattibabu, K. Banerjee, Saket Asthana, V. Satya Narayana Murthy, J. Arout Chelvane
Summary: Ba and Sn element substitutions distorted the crystal structure as evidenced by X-ray diffraction and Fourier transform infrared spectra; the substituted compounds showed improved magnetic properties and higher breakdown voltages compared to the original BiFeO3 compound.
MATERIALS TODAY-PROCEEDINGS
(2021)
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)
