Article
Materials Science, Multidisciplinary
Vojtech Necina, Sebastian E. Gass, Tereza Uhlirova, Mariano H. Talou, M. Andrea Camerucci, Analia G. Tomba Martinez
Summary: The high-temperature mechanical behavior of partially sintered alumina and zirconia ceramics with different porosities and degrees of sintering was evaluated. Load-deflection curves were obtained from three-point bending tests at 1100 degrees C, and the obtained elastic modulus was compared to Young's modulus. The effects of progressive sintering and weak bonds between particles affected the static elastic modulus, resulting in lower values compared to the impulse excitation technique. A good correlation was found between the dynamic and static modulus for both ceramics.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Ceramics
Ding Zhou, Huabei Qi, Bing Zhou, Yue Wang, Zili Zhou, Lianbo Wang, Jiayue Xu, Ying Shi
Summary: LuAG nanocrystalline powders were synthesized using ammonium hydroxide and ammonium hydrogen carbonate as mixed precipitant. The obtained LuAG powders showed good sinterability and high optical quality when sintered at low temperature in H-2 atmosphere by PLSH technology. Transparent ceramics doped with various rare earth ions could be prepared without sintering aids and HIP post-treatment.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Lin-Lin Zhu, Hong-Lan Liu, Hua-Tay Lin, Xing-Hao Tan, Jia-Hao Chen, Xin Xu, Guang-Xiang Zhang, Yu-Jian Jian, Min-Min Dai, Cheng-Cai Zhao
Summary: Erbium oxide transparent ceramics were successfully fabricated with different contents of zirconia additive, and the effects of zirconia concentration on the microstructure, optical, mechanical, and thermal properties were investigated. Increasing the zirconia concentration resulted in smaller grain size and increased hardness and fracture toughness, but slightly decreased thermal diffusion coefficient and thermal conductivity. The doped ceramics showed absorption peaks and achieved high in-line transmittance in the visible range.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Y. Wade-Zhu, J. Wade-Zhu, H. Wu, J. Binner, B. Vaidhyanathan
Summary: The ballistic impact performance of nanocrystalline zirconia-toughened alumina (nZTA) ceramics was compared to monolithic alumina, showing no significant advantage in penetration resistance. Deformation analysis of fragments indicated that both nZTA and alumina experienced similar levels of plastic deformation, with finer fragments exhibiting more plastic deformation. These results were further confirmed through fracture surface observations and subsurface dislocation analysis using SEM and TEM.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Reza Ghayoor, Mohammad Hassan Yousefi
Summary: Monitoring and controlling the oxygen concentration in the fume is an efficient way to regulate combustion efficiency. This study successfully achieved a pure cubic phase in zirconia by adding yttria as a stabilizer. The nanosized zirconia powders were transformed into dense and high-quality pellets using a spark plasma sintering process. The results showed that the pellets obtained from this process have a pure phase structure and uniform morphology, and exhibit higher electrical conductivity compared to conventionally sintered pellets.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Crystallography
Ling Gao, Ruidong Guan, Shengnan Zhang, Hao Zhi, Changqing Jin, Lihua Jin, Yongxing Wei, Jianping Wang
Summary: This study synthesized Mn-stabilized ZrO2 ceramics through solid state sintering and evaluated their microstructures and electrical properties. The results showed that Mn doping significantly increased the conductivity of the electrolyte, with the highest conductivity obtained from Zr0.75Mn0.25O2-delta samples.
Article
Materials Science, Multidisciplinary
Yudong Sui, Yanru Yuan, Pan Tan, Yehua Jiang, Lina Han
Summary: This paper investigates the effect of Nb2O5 content on the composition, microstructure, and physical and mechanical properties of ZTA ceramics. It is found that trace amounts of Nb2O5 dissolve in ZrO2 grains and result in grain refinement and increased density. However, excessive Nb2O5 leads to grain growth and decreased relative density. The addition of Nb2O5 also promotes microstructural uniformity. The composite with 0.25 wt.% Nb2O5 exhibits the highest Vickers hardness and indentation fracture toughness.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Ceramics
Vladimir Prajzler, Karel Maca, Premysl St'astny, Richard Todd
Summary: The study found that in flash sintered 3YSZ ceramics, the microstructural homogeneity decreased with increasing direct current density and dwell time in a flash state, eventually leading to abnormal grain growth.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Engineering, Manufacturing
Jinyang Xu, Linfeng Li, Ming Chen, J. Paulo Davim
Summary: This study investigated the milling characteristics of fully-sintered zirconia ceramics using PCD tools under different cutting conditions, revealing that increasing the feed per tooth raises milling forces and temperatures, while increasing cutting speed increases temperatures but decreases forces. The feed per tooth significantly affects the surface topographies of cut zirconia surfaces. The PCD tool demonstrates the feasibility of hard milling fully-sintered zirconia ceramics with minimal wear along its cutting edge.
MATERIALS AND MANUFACTURING PROCESSES
(2022)
Article
Nanoscience & Nanotechnology
Mianyi Yao, Yujin Wang, Lei Chen, Jiahu Ouyang, Haixia Li, Hui Gu, Yu Zhou
Summary: In this study, a series of TiB2-TiC composites were successfully fabricated using powders obtained by high-energy ball-milling, and the effects of different preparation conditions on powder crystal structure and composite material properties were investigated. It was found that two-step pressureless sintering is beneficial for improving the densification and mechanical properties of the materials, as well as forming core-rim structures. Additionally, the selective solution of WC into TiC grains was experimentally verified, resulting in composites with excellent comprehensive performance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Multidisciplinary Sciences
Rakia Daly, Nawel Khitouni, Maria Luisa Escoda, Nuria LIorca Isern, Sunol Martinez Juan Jose, Jean Marc Greneche, Mohamed Khitouni
Summary: The study focuses on the structural and magnetic properties evolution of Fe50Co25Ni25 nanocrystalline powder mixture processed by high-energy planetary ball milling under argon atmosphere. After 100 hours of milling, two nanocrystalline phases were identified, which exhibit soft ferromagnetic behavior and are related to dislocation density and stacking faults.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2021)
Article
Materials Science, Ceramics
Shiva Bejugama, Shibu Chameettachal, Falguni Pati, Ajoy Kumar Pandey
Summary: The study synthesized Niobia doped Ceria Stabilized Zirconia powders using a co-precipitation method, achieving fine grain size, high hardness, and optimal fracture toughness through two-step sintering. Accelerated hydrothermal aging test showed the samples' high resistance to Low Temperature Degradation without phase change. Cell compatibility test indicated the high biocompatibility of the samples.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Hsing-I. Hsiang, Yu-Hsuan Yang, Chi-Yuen Huang, Keshin Yang
Summary: This study investigates the effects of calcination treatment on the properties of Ba0.95Ca0.05TiO3 (BCT) ceramic. Calcination promotes sintering densification and enables densification at lower temperatures. Calcined samples show higher dielectric constant, lower losses, and higher resistivity. The increased conduction activation energies in calcined samples are attributed to lower concentrations of certain elements. Calcination improves dielectric properties and insulation resistance of BCT.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Chemistry, Physical
Zhi-Gang Wang, Yun-Zhuo Zhang, Jia-Hu Ouyang, Xi-Wen Song, Min Xie, Ya-Ming Wang, Yu-Jin Wang
Summary: This paper provides a comprehensive review on the basic principles, advanced solidification processes, microstructure, and mechanical properties of nanocrystalline alumina-zirconia-based eutectic ceramics. It discusses the coupling growth principle, solidification techniques, and control strategy of solidification behavior. The microstructural formation of nanoeutectic structure and the mechanical properties, such as hardness, flexural and tensile strength, fracture toughness, and wear resistance, are also emphasized. Nanocrystalline alumina-zirconia-based eutectic ceramics with unique microstructural and compositional characteristics have shown promising improvements in mechanical performance compared to conventional eutectic ceramics.
Article
Engineering, Electrical & Electronic
Quan Ding, Hua Hao, Fang Wang, Kangchuang Li, Zhonghua Yao, Minghe Cao, Hanxing Liu
Summary: Ba(0.5-1.5x)Sr0.5LaxTiO3(x = 0.005,0.01,0.015,0.02) ceramics were synthesized in N-2 atmosphere by solid state reaction method. All samples exhibited a cubic perovskite phase. The sample with x = 0.01 showed a relative dielectric constant of 115,648 at 1000 Hz and 25 °C, with a low dielectric loss of less than 0.04 and a relatively high dielectric temperature stability in the range of 25-250 °C. Annealing the same sample in air caused a decrease in dielectric constant and an increase in dielectric loss, accompanied by two sets of dielectric loss peaks. The relaxation behavior was attributed to the thermal motion of oxygen vacancy and its defective dipole, providing a reference for future studies on dielectric properties of modified materials.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Aygul A. Mukhametgalina, Mariya A. Murzinova, Ayrat A. Nazarov, Asiya A. Samigullina, Milos Janecek, Josef Strasky, Kristina Bartha, Jakub Cizek
Summary: The microstructure and room temperature mechanical properties of alpha-titanium alloy Ti-5Al-0.5 V subjected to equal channel angular pressing (ECAP) and subsequent ultrasonic treatment (UST) were studied. The results showed that UST had little impact on dislocation density and vacancy concentration, and did not significantly affect the mechanical properties of the ECAP-ed titanium alloys.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Artem Musiienko, Jakub Cizek, Hassan Elhadidy, Petr Praus, Kate Higgins, Bogdan Dryzhakov, Andrii Kanak, Franck Sureau, Jindrich Pipek, Eduard Belas, Marian Betusiak, Mykola Brynza, Eric Lukosi, Bin Hu, Mahshid Ahmadi
Summary: The study found that both hybrid and all-inorganic MHPs exhibit low concentrations of vacancies regardless of their synthesis method, with crystals grown from solution prone to solvent inclusion during synthesis.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Artem Shylo, Igor Danilenko, Oksana Gorban, Oleksandr Doroshkevich, Igor Nosolev, Tetyana Konstantinova, Andriy Lyubchyk
Summary: This study focuses on the development of energy storage media based on zirconia nanoparticles. It discovers the capability of compacted zirconia nanoparticles to accumulate electrical charge, which depends on the particle size and surface hydration. The study demonstrates that the formation of the dielectric constant of the entire structure in hydrated nanoparticle systems is influenced by the dielectric properties of the nanoparticle materials and water molecules on the surface. The disparity in dielectric properties between the filler (water) and the matrix (zirconia nanoparticle material) results in a significant increase in the dielectric constant of hydrated compacted nanoparticles through the Maxwell-Wagner effect, offering promising applications in energy storage media development.
JOURNAL OF NANOPARTICLE RESEARCH
(2022)
Review
Materials Science, Multidisciplinary
Kaveh Edalati, Andrea Bachmaier, Victor A. Beloshenko, Yan Beygelzimer, Vladimir D. Blank, Walter J. Botta, Krzysztof Bryla, Jakub Cizek, Sergiy Divinski, Nariman A. Enikeev, Yuri Estrin, Ghader Faraji, Roberto B. Figueiredo, Masayoshi Fuji, Tadahiko Furuta, Thierry Grosdidier, Jeno Gubicza, Anton Hohenwarter, Zenji Horita, Jacques Huot, Yoshifumi Ikoma, Milos Janecek, Megumi Kawasaki, Petr Kral, Shigeru Kuramoto, Terence G. Langdon, Daniel R. Leiva, Valery Levitas, Andrey Mazilkin, Masaki Mito, Hiroyuki Miyamoto, Terukazu Nishizaki, Reinhard Pippan, Vladimir V. Popov, Elena N. Popova, Gencaga Purcek, Oliver Renk, Adam Revesz, Xavier Sauvage, Vaclav Sklenicka, Werner Skrotzki, Boris B. Straumal, Satyam Suwas, Laszlo S. Toth, Nobuhiro Tsuji, Ruslan Z. Valiev, Gerhard Wilde, Michael J. Zehetbauer, Xinkun Zhu
Summary: This article comprehensively reviews recent advances in the development of ultrafine-grained and nanostructured materials through severe plastic deformation and provides a brief history of this field. Severe plastic deformation methods have been effective in producing materials with advanced mechanical and functional properties, and the field of NanoSPD has experienced significant progress in the past two decades.
MATERIALS RESEARCH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Michal Leibner, Martin Vlach, Veronika Kodetova, Hana Kudrnova, Jozef Vesely, Sebastien Zikmund, Jakub Cizek, Oksana Melikhova, Frantisek Lukac
Summary: The effect of cold-rolling and high-temperature aging on precipitation processes in an Al-Er-Zr alloy was investigated. Based on the results, the decomposition sequence of the supersaturated solid solution was proposed. Cold-rolling enhances the precipitation of Al3Er particles and accelerates the formation of the Zr-rich shell around the Er-rich core. The coherency strain-field around the precipitates is retained even after 4 hours of aging at 600℃.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Jakub Cizek, Tomas Vlasak, Oksana Melikhova
Summary: Lattice defects in refractory metal high-entropy alloy HfNbTaTiZr were investigated using positron lifetime spectroscopy and coincidence Doppler broadening spectroscopy. The results showed that annealing the alloy at 1000 degrees C resulted in the full recovery of defects and the formation of a single-phase random solid solution. Quenching the alloy from high temperature prevented the recovery of thermally equilibrium vacancies and maintained a high concentration of vacancies at ambient temperature. The study also revealed that vacancies in the alloy were preferentially coupled with Hf solutes.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Oksana Gorban, Igor Danilenko, Igor Nosolev, Emir Abdullayev, Akhmed Islamov, Konstantin Gavrilenko, Aleksandr Doroshkevich, Oleksiy Shvets, Sergey Kolotilov
Summary: In this study, pure ZrO2 and ZrO2 doped with Y2O3 were prepared and characterized at different temperatures. The results showed that the phase composition, particle size, surface defects, and acidity of the samples varied with the doping of Y2O3 and the calcination temperature. Furthermore, the Y-doped ZrO2 samples exhibited higher catalytic activity in the oxidation reaction compared to pure ZrO2.
JOURNAL OF NANOPARTICLE RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Igor Danilenko, Marharyta Lakusta, Larisa Loladze, Galina Volkova, Inna Popov, Valentina Glazunova, Leonid Akhkozov, Andrii Shut, Tetyana Konstantinova
Summary: The effect of particle size on the dominant densification mechanism at the initial stage of sintering of tetragonal zirconia nanoparticles was investigated. It was found that a decrease in particle size resulted in a change in the diffusion mechanism, with the volume diffusion mechanism dominant at larger particle sizes and the grain-boundary diffusion mechanism dominant at smaller particle sizes. The change in densification parameter n was attributed to the increase in the particle surface to volume ratio.
RESULTS IN PHYSICS
(2022)
Article
Chemistry, Physical
Lenka Volfova, Stefan Andrei Irimiciuc, Sergii Chertopalov, Petr Hruska, Jakub Cizek, Martin Vondracek, Michal Novotny, Maik Butterling, Maciej Oskar Liedke, Andreas Wagner, Jan Lancok
Summary: The influence of oxygen pressure on the structural and physical properties of various copper oxide phases grown by Pulsed Laser Deposition (PLD) on MgO (100) was investigated. Positron annihilation spectroscopy revealed the presence of positrons trapped at vacancies and large vacancy clusters with lifetimes ranging from 400 ps to 500 ps. Single copper vacancies were found in the CuO phase, while copper vacancy complexes coupled with oxygen vacancies were observed in the Cu2O phase. Suitable O-2 atmosphere conditions that induced a mixture of copper oxide phases were identified. In situ diagnostic techniques based on Optical Emission Spectroscopy and Langmuir Probe were used to monitor the deposition process and correlate with film properties.
APPLIED SURFACE SCIENCE
(2023)
Article
Astronomy & Astrophysics
Jan Wild, Jakub Cizek, Libor Nouzak, Jiri Pavlu, Jana Safrankova, Zdenek Nemecek, Jakub Vaverka, Dalibor Nosek, Tomas Burian, Anna Wildova, Jan Broulim
Summary: We present the first laboratory experiment investigating the interaction between a cosmic dust simulant and positrons emitted from a Na-22 radioisotope. By accurately measuring the charge of micrometer-sized SiO2 dust grains, we observed +1 e steps, indicative of positron annihilation inside the grain. The rate of these charging events aligns well with predictions from a model based on the continuous slowing down approximation of energetic positrons within the grain. Additionally, we attributed less frequent charging steps larger than +1 e to the emission of secondary electrons during the positron slowing down process. The coefficient of secondary electron emission was found to be approximately inversely proportional to the grain radius. Based on our experimental findings, we propose a potential scenario for charging in interstellar dark clouds.
ASTROPHYSICAL JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
O. Zivotsky, Y. Jiraskova, J. Bursik, D. Janickovic, J. Cizek
Summary: The structure and magnetic properties of Mn2FeSi alloy, a potential Heusler material, were studied using rapid solidification technology. It was found that the as-prepared Mn2FeSi ribbon exhibited paramagnetism at room temperature and had a cubic structure with a lattice parameter of 0.567 nm. The presence of other phases at low temperatures affected the structural and physical properties of the sample after annealing.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jan Zich, Martin Misek, Vaclav Holy, Karel Carva, Jakub Cizek, Jiri Navratil, Patrik Cermak, Petr Knotek, Katerina Cermak Sraitrova, Stanislav Cichon, Jiri Hejtmanek, Zdenek Jirak, Cestmir Drasar
Summary: Fe-intercalated Bi2Se3 single crystals exhibit unique physical properties, including superconductivity, pronounced Shubnikov-de Haas oscillations, and high carrier mobility. These properties are correlated with the structural properties and point defects of the crystals. The study suggests that the inhomogeneous distribution of defects in the sample volume may be responsible for the interesting properties of Bi2Se3.
Article
Multidisciplinary Sciences
Anton Gorban, Artem Shylo, Viktoriia Dmitrenko, Sergii Tsololo, Leonid Akhkozov, Valery Burkhovetsky, Olesya Shapovalova, Oksana Gorban, Igor Danilenko
Summary: The engineering of doped zirconia nanoparticles for energy application is studied, focusing on the correlations between salt concentration-powder dispersity, calcined temperature-particle's sizes, and materials structure-materials functionality. The study also investigates the activation energies of oxygen diffusion in grains and grain boundaries, showing that the energy activation of bulk oxygen diffusion is independent of ceramic grain size. Additionally, the study reveals that the density of sintered ceramic has a greater impact on its electrophysical properties than grain size.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Marc Wenskat, Jakub Cizek, Maciej Oskar Liedke, Maik Butterling, Martin Stiehl, Guilherme Dalla Lana Semione, Constanze Backes, Christopher Bate, Oksana Melikhova, Eric Hirschmann, Andreas Wagner, Hans Weise, Andreas Stierle, Martin Aeschlimann, Wolfgang Hillert
Summary: Superconducting radio-frequency (SRF) cavities have shown potential as qubits for quantum computing and are crucial components in modern particle accelerators. Recent research has found that temperature treatment can improve their performance by reorganizing the niobium oxide and near-surface vacancy structure.
