Article
Materials Science, Ceramics
Peide Luo, Xiang Wu, Wenhui Xiao, Fan Zhang, Yao Wang, Dandan Huang, Yong Du
Summary: The phase relations in the ZrO2-Ta2O5-Nb2O5 system were experimentally investigated and thermodynamically modeled. It was found that Ta2O5 and Nb2O5 phases substantially extend into the ternary system, forming a continuous solid solution. Despite initial difficulties in reproducing experimental results, the introduction of ternary mixing parameters allowed for improved thermodynamic descriptions and successful validation of the data.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Mechanics
Matthew R. Walker, Marija Vucelja
Summary: The study considers the thermal relaxation of a particle in a piecewise-constant potential landscape and the connection between the Mpemba effect, metastable states, and phase transitions. The Mpemba effect is found to exist even in cases without metastable states and the borders of the areas where the effect happens correspond to either eigenvector changes of direction or to phase transitions. Discussions on the topological aspects of the strong Mpemba effect and proposing the use of topology to search for the Mpemba effect in a physical system are also presented.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Multidisciplinary Sciences
Domagoj Fijan, Mark Wilson
Summary: This article examines the appearance and evolution of thermodynamic anomalies and their related properties in two classes of systems. By manipulating model parameters, researchers can track the emergence and evolution of these anomalies in the phase space. The interactions between these anomalies can often be explained by thermodynamic rules. The emergence of these anomalies may also be correlated with the existence of multiple amorphous states.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Chemistry, Physical
Micaela Ponce Ponte, Martina Bianco, Marcela Longhi, Carolina Aloisio
Summary: The purpose of this study was to improve the permeability of acyclovir by developing a water-in-oil microemulsion. Pseudoternary phase diagrams were constructed to identify the regions for obtaining microemulsions. The results showed that microemulsions can enhance the permeability of acyclovir, indicating their potential to improve the efficacy of oral pharmaceutical formulations.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Physics, Multidisciplinary
Massimo Tomellini
Summary: The Fokker-Planck (FP) equation is used to describe the temporal evolution of the particle size probability density function (PDF) for KJMA transformations. In this study, the FP equation is derived for the classical case of transformations with constant rates of nucleation and growth in 3D space. The integration of the equation shows that the PDF can be represented by the superposition of gamma distributions with time-dependent mean size given by the KJMA theory. Computer simulations confirm the agreement between the temporal evolution of the PDF and the Johnson-Mehl PDF for transformations with constant nucleation and growth rates. The FP equation provides a particle size PDF that exhibits the observed behavior.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Christopher A. Hareland, Gildas Guillemot, Charles-Andre Gandin, Peter W. Voorhees
Summary: A unified thermodynamic description is proposed for moving non-equilibrium interfaces in solid-solid and solid-liquid transformations. The theory applies to concentrated multicomponent alloys with diffusion in both phases or only in the parent phase, and considers energy dissipation due to solute drag. The study reveals that solute drag affects both the velocity of the interface and the distribution coefficients for the compositions of the two phases at the interface.
Review
Materials Science, Multidisciplinary
Kai Xu, Chengcheng Zhan, Ming Lou, Xuelian Xiao, Ruonan Zhou, Fangming Wang, Xiaofei Hu, Yuan Yuan, Keke Chang
Summary: Rare-earth elements, also known as industrial vitamins, are widely used in modern lives, especially in high-tech applications. Despite their close chemical similarities, these elements have different characteristics. The microalloying effect of rare-earth elements is crucial for improving the properties of materials, and the study of phase diagrams related to rare-earth elements is essential for the design and optimization of materials. However, the knowledge in this area is relatively scarce compared to commonly-used elements.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Crystallography
Boris B. Straumal, Roman Kulagin, Brigitte Baretzky, Natalia Yu. Anisimova, Mikhail V. Kiselevskiy, Leonid Klinger, Petr B. Straumal, Olga A. Kogtenkova, Ruslan Z. Valiev
Summary: This review discusses the intersection of phase transformations, severe plastic deformation (SPD), and high-entropy alloys (HEA) in materials science. The use of SPD techniques enables the determination of single-phase regions and the formation of nanoparticles in HEAs, influencing their composition, structure, and properties.
Article
Materials Science, Multidisciplinary
Paulina Lagodzinska, Beata Dejak, Bartlomiej Konieczny
Summary: The study assessed the effect of airborne-particle abrasion with alumina particles of various sizes on the surface properties of 3Y-TZP. The results showed that airborne-particle abrasion with 50 μm alumina significantly increased the hardness of 3Y-TZP, while 110 μm and 250 μm alumina particles had no such effect. The size of the alumina particles played a role in the air abrasion of zirconia-based dental ceramics, affecting their morphology and properties.
Article
Materials Science, Multidisciplinary
Isabel R. Crystal, Christopher A. Schuh
Summary: Bulk polycrystalline zirconia-based ceramics often crack during martensitic transformations due to transformation mismatch stresses. Smaller grain sizes require more cycles to disaggregate due to larger grain boundary area that must crack. The energy relieved through cracking decreases with increasing grain size, suggesting the need for alternate accommodation mechanisms at larger grain sizes to relieve transformation mismatch stresses.
Review
Materials Science, Multidisciplinary
Michael Musi, Gloria Graf, Helmut Clemens, Petra Spoerk-Erdely
Summary: This review provides a detailed survey of the research work on the influence of technically important alloying elements on the Ti-Al phase diagram in γ-TiAl based alloys. After introducing the fundamentals of phase transformations, the alloying elements are discussed and their particularities are highlighted.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Ping Ma, Wuhui Li, Erdong Wu
Summary: Minor addition of Sc significantly improves hydrogen activation and storage properties in Ti1-xScxMn1.6-V-0.4 alloys, with the activation properties strongly depending on particle sizes. Samples with smaller particle sizes are difficult to activate.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Ceramics
Yeqing Ling, Xiandong Hao, Sirui Zhang, Jin Chen, Lei Gao, Mamdouh Omran, Guo Chen
Summary: In this study, zirconia ceramics were prepared by sintering nano-CeO2 (Ce = 7 mol%) doped zirconia powder under high-frequency microwave irradiation. The different effects of temperature environment on the phase structure transformation, surface functional groups, microstructure, growth process, and density of doped zirconia were analyzed, and the optimized microwave sintering process for zirconia was determined. The experimental results show that the tetragonal phase of zirconia is positively correlated with temperature, and the density and growth activation energy of zirconia are also related. Furthermore, the efficient heating of microwave and the incorporation of nano-ceria stabilizer affect the particle growth and phase transition temperature of zirconia.
CERAMICS INTERNATIONAL
(2022)
Article
Optics
Z. U. Rehman, S. Ullah, H. Qayyum, M. Irfan, K. A. Tran, H. Suk, A. Qayyum, K. A. Janulewicz
Summary: Optical breakdown inside a transparent dielectric induced by a tightly focused laser beam leads to extreme thermodynamic conditions and major structural transformations. High-resolution electron microscopy revealed the formation of nano-crystals in the transition area between amorphous and crystalline phases, mainly located near the geometrical focus. Spectral analysis showed material densification through redistribution, spatial segregation, and glass network reorganization pathways.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Julian Gebauer, Peter Franke, Hans Juergen Seifert
Summary: The binary tantalum-oxygen system was evaluated using experimental data and the CALPHAD method, investigating the solubility of oxygen in the tantalum solid-solution phase and describing different forms of tantalum oxide compounds. Additionally, the dataset was extended into the ternary Al-Ta-O system by incorporating binary datasets for aluminum-oxygen and aluminum-tantalum systems, and a mixed-oxide AlTaO4 was added. The ternary Al-Nb-O system dataset was also created by combining binary datasets from the literature and assessing the quasibinary section Al2O3-Nb2O5, with phase equilibria between refractory metals and alumina at high temperature being discussed.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Ceramics
Langston Tillman, Albert Voskanyan, Alexandra Navrotsky
Summary: This study successfully synthesized mesoporous silica with an average pore size of 10 nm using forsterite as a silica source, providing a potentially cheaper and more environmentally friendly route to making technologically important porous silica materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Gerson J. Leonel, Manuel Scharrer, Gurpreet Singh, Alexandra Navrotsky
Summary: This study systematically investigates the thermodynamic stability of SiaOb(M)(c)C-d structures derived from polymeric precursors incorporating metal fillers: Ta, Nb, and Hf, at 1200 and 1500°C. The results show that overall incorporation of Hf results in the most thermodynamically stable structures at all synthesis temperatures. SiaOb(M)(c)C-d specimens employing Nb fillers undergo the most stable structural evolution in this temperature range. The choice of metal filler influences composition, structural evolution, and thermodynamic stability in PDCs.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Chemistry, Physical
K. Jayanthi, Shubham Lochab, Prabeer Barpanda, Alexandra Navrotsky
Summary: Mixed phosphates have been studied as cathode materials for sodium-ion batteries. High-temperature oxide melt solution calorimetry was used to establish the relationship between thermodynamic phase stability and capacity. The order of thermodynamic phase stability is Na4Mn3(PO4)(2)P2O7 > Na4Fe3(PO4)(2)P2O7 > Na4Co3(PO4)(2)P2O7 > Na4Ni3(PO4)(2)P2O7. Thermodynamic studies provide guidelines for selecting potential cathode materials.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
K. Jayanthi, Grace Neilsen, Alexis Gibson, Alexandra Navrotsky, Brian F. Woodfield
Summary: Room-temperature acid solution calorimetry, high-temperature oxide melt solution calorimetry, and low-temperature heat capacity measurements were used to calculate the thermodynamic stabilities of different anions in [Zn-Al-X] layered double hydroxides (LDH). Cryogenic heat capacity measurements showed a Schottky-type anomaly below 11 K, attributed to proton tunneling between adjacent oxygen atoms in the LDH interlayer. The order of stability was determined based on enthalpies and entropies of formation, with [Zn-Al-SO4] being the most stable.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Ceramics
Gerson J. J. Leonel, Xin Guo, Gurpreet Singh, Christel Gervais, Alexandra Navrotsky
Summary: This study investigates the thermodynamic stability of SiC(O) and SCN(O) ceramics derived from different polymeric precursors. The results show that the microstructure of the polymer-derived ceramics (PDCs) differs depending on the precursor used. The addition of nitrogen contributes to the thermodynamic stabilization of PDCs, particularly in the case of SiCN(O) structures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Biochemistry & Molecular Biology
Alexandra Navrotsky, Anastasia Koryttseva
Summary: The paper analyzes the acid-base interactions and thermodynamics in different oxide systems. It systematizes and analyzes extensive data on enthalpies of solution of binary oxides in oxide melts. The ionic model combined with the Lux-Flood description provides a consistent and useful interpretation of the data and their application for understanding the thermodynamic stability of oxide systems.
Article
Chemistry, Physical
Gerson J. Leonel, Cameron B. Lennox, Joseph M. Marrett, Tomislav Friscic, Alexandra Navrotsky
Summary: This study investigates the effect of changes to the divalent metal node on the thermodynamic stability of zeolitic imidazolate frameworks. The use of nodes with larger ionic radius metals stabilizes the porous sodalite topology. Contrary to popular belief, the 2D frameworks are energetically stable, shedding light on the energetic landscape of these materials.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
K. Jayanthi, Stacey. I. Zones, Alexandra Navrotsky
Summary: The transfer of partially hydrophobic organo-cations from high ionic strength media may not play a nucleation role in zeolite synthesis, as suggested by the thermodynamics of partitioning of an organic structure-directing agent. The Gibbs free energies of transfer were close to zero, indicating a balance between exothermic enthalpies and negative entropies. There is no correlation between the thermodynamics of transfer and the efficacy of the organic structure-directing agents in zeolite synthesis, suggesting that the critical factors in zeolite synthesis are controlled kinetically rather than thermodynamically.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Physical
Gerson J. Leonel, Cameron B. Lenox, Yizhi Xu, Mihails Arhangelskis, Tomislav Friscic, Alexandra Navrotsky
Summary: We present the first experimental and theoretical study on the thermodynamic driving force for the reaction between metal-organic framework (MOF) materials and carbon dioxide, resulting in the formation of metal-organic carbonate phase. The carbonation of MOFs upon exposure to CO2 is a crucial aspect in the development of carbon storage technologies, and our research demonstrates that the formation of carbonate material from the widely used SOD-topology framework material ZIF-8, as well as its dense-packed dia-topology polymorph, is highly exothermic. Moreover, through analyzing the crystal structure of the starting and final phases in the carbonation reaction, we have identified periodic density functional theory approaches that can accurately reproduce the measured reaction enthalpies, allowing for more precise calculations of the driving forces behind the carbonation of zeolitic imidazolate frameworks.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Gerson J. Leonel, Tamilarasan Subramani, Alexandra Navrotsky
Summary: This study explores the system dependence of CO2 confinement in metal-organic frameworks using different metals and ligands. The results show that the choice of metal and linker significantly affects the energetic drive for CO2 confinement, with larger linkers providing the greatest enhancement of CO2 adsorption energetics.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Gerson J. Leonel, Cameron B. Lennox, Manuel Scharrer, K. Jayanthi, Tomislav Friscic, Alexandra Navrotsky
Summary: This study investigates the energetics of boron-imidazolate frameworks (BIFs) synthesized by mechanochemistry. The stabilizing effect of metal nodes in sodalite (SOD) and diamondoid (dia) topologies is assessed using the same tetratopic linker based on tetrakis-(imidazolyl)boric acid but with different monovalent cation metal nodes. The thermodynamic stability of the frameworks is determined by the enthalpy of formation from endmembers, showing that heavier metal nodes promote greater energy stabilization in denser structures. The results suggest a unified aspect of thermodynamic stabilization across MOF systems.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Megan A. Householder, Tamilarasan Subramani, Kristina Lilova, James R. Lyons, Rhonda M. Stroud, Alexandra Navrotsky
Summary: The surface thermodynamics of minerals play an important role in their properties and occurrence. This study presents the first direct measurement of the surface energy of enstatite using high-temperature oxide melt solution calorimetry. The results show that the surface energy of enstatite is comparable to that of forsterite and larger than many nonsilicate oxide materials. The interfacial energy of enstatite appears to be close to zero.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Benjamin L. Brugman, Manuel Scharrer, Tullio S. Geraci, Alexandra Navrotsky
Summary: The demand for cobalt has significantly increased due to its widespread use in technology, particularly in the battery industry. However, cobalt is relatively scarce in the Earth's crust, with Central Africa dominating its ore supply. Political instability and unethical mining practices pose risks to the global supply. Therefore, alternative sources and new production and processing methods are needed. However, the thermodynamic stability of cobalt-bearing compounds is not well understood due to incomplete and scattered data in literature. This review aims to provide a comprehensive overview of the available thermodynamic data for cobalt minerals and ores, as well as inorganic synthetic compounds, and identify gaps and future research directions.
MATERIALS TODAY ENERGY
(2023)
Article
Materials Science, Ceramics
Gerson J. Leonel, Xin Guo, Gurpreet Singh, Alexandra Navrotsky
Summary: This study examines the energetics and structure of polymer derived ceramics (PDCs) obtained from the pyrolysis of different preceramic polymers. The results indicate that PDCs derived from different polymers have differences in composition and microstructure. PDCs derived from low-cost commercial precursors show higher thermodynamic stability compared to those derived from an industrial preceramic polymer. The thermodynamic stability of SiOCs increases with the pyrolysis temperature.
Article
Chemistry, Physical
Aleksandra Mielewczyk-Gryn, Tamilarasan Subramani, Daniel Jaworski, Kristina Lilova, Wojciech Skubida, Alexandra Navrotsky, Maria Gazda
Summary: A series of multi-component oxides based on BaZrO3 were synthesized and their water uptake behavior and thermodynamics of formation were investigated. The proton defect concentrations varied depending on the type and amount of acceptor substitution, with a maximum concentration of 0.2 mol/mol observed in a compound containing 10 different elements in the B-sublattice, 50% of which act as acceptors. The enthalpies and entropies of hydration were calculated for the most promising materials using van't Hoff plots, revealing more negative values at lower temperatures, indicating a more exothermic process of proton incorporation.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Ceramics
Zilong Xiong, Wenzhuo Xue, Mujun Li, Feihu Tan, Yupeng Chen, Hongyu Yu
Summary: In this study, CBS glass/Al2O3 composites were developed for LTCC applications based on a CaO-B2O3-SiO2 (CBS) glass system with a high boron content. The study revealed that the softening of glass and interfacial reaction between the glass and Al2O3 were the two most important factors affecting LTCC's densification process. Real-time shrinkage rate of LTCC during sintering was successfully simulated, and it was proven that the formation of the CaAl2(BO3)O phase played a significant role in reducing glass viscosity and promoting dense structure formation. The resulting LTCC composite exhibited excellent performance for high-frequency applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Saurabh Kumar Sharma, Vinita Grover, Rakesh Shukla, Abid Hussain, Ambuj Mishra, Pawan Kumar Kulriya
Summary: In this study, the disordering caused by swift heavy ion irradiation in two different compositions of pyrochlore structures was investigated. X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy were used to analyze the samples before and after irradiation. It was found that both compositions underwent amorphization due to irradiation, with a slower rate observed in Nd1.8Zr2.2O7.1. The irradiation-induced modified track region in Nd1.8Zr2.2O7.1 consisted of defect-rich pyrochlore structure, anion-deficient fluorite structure, and amorphous domains.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiabei He, Mengshan Song, Ming Yang, Miaomiao Zhu
Summary: This study investigates the influence of ion irradiation on high-entropy ceramics and finds that irradiation-induced lattice rearrangement can improve the radiation resistance of these ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yajie Yu, Shi He, Zhengang Zhang, Haihua Chen, Peipeng Jin, Binnian Zhong, Linhui Zhang, Liping Wang, Cheng Lu
Summary: Silicide ceramics, including tantalum disilicide (TaSi2), are known for their exceptional physical properties but are limited in practical applications due to their inherent brittleness at room temperature. In this study, we successfully improved the mechanical properties of TaSi2 ceramics and increased their electrical conductivity by modifying the preparation methods and sintering conditions. These findings provide valuable insights for future applications of TaSi2 and the design of advanced ceramic materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jian Li, Jia Liu, Yongcui Zhang, Wei Sun, Yang Wang, Haitao Wu, Ling Li, Chuanbing Cheng, Yingying Wang, Ke Tan, Futian Liu
Summary: Microstructure design plays a crucial role in regulating the microwave dielectric properties of materials, however, the understanding of frequency temperature stability and related micromechanism remains limited. In this study, a combination of first-principles calculations and experimental observation was used to investigate the correlation among sintering behavior, crystal structure, bonding nature, and microwave dielectric properties of LnPO(4) (Ln = Eu, Pr) ceramics. The research findings systematically clarify the optimized effect and micromechanism of lanthanides on the dielectric properties of monazite ceramics, providing insights into the design and enhancement of microwave dielectric materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Wenqian Pan, Xizhen Xia, Wei Zhou, Yang Li
Summary: The study investigates the frictional and wear behaviors of carbon fiber-reinforced SiC ceramic matrix composites with different fiber orientations mating with ceramic balls. The results show that fiber orientation significantly affects the friction and wear properties of the composites. Pads with randomly arranged fibers demonstrate better friction stability and lower wear volume, potentially suitable for bearing material applications. The research also explores the factors influencing the formation of continuous tribo-film and identifies abrasive wear and oxidation wear as the dominant wear mechanisms for the friction pairs.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sergey Nikolaevich Perevislov, Ilya Evgenievich Arlashkin, Valentina Leonidovna Stolyarova
Summary: This paper describes the synthesis and sintering of MAX phases in the Zr-Al-C system. Different mixtures of initial Zr/Al/C and Zr/Al/ZrC powders were used to synthesize Zr2AlC and Zr3AlC2 MAX phases. The highest content of Zr3AlC2 MAX phase was obtained using a component ratio of 1:1.5:2-51.1 vol.% of Zr/Al/ZrC powders.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Weijia Luo, Xubin Wang, Baiheng Bai, Jianli Qiao, Xingcong Chen, Yongzheng Wen, Jingbo Sun, Lingxia Li, Ji Zhou
Summary: This study successfully establishes the relationship between internal strain and dielectric loss by synthesizing and designing specific structure of tungsten bronze ceramics, and concludes that controlling internal strain can effectively reduce dielectric loss. This research is of great significance for the development of future all-ceramic non-Hermitian devices.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Santanu Mondal, Juan Diego Shiraishi Lombard, Sreenivasulu Gollapudi, Carolina Tallon, Jie-Fang Li, Dwight Viehland
Summary: Ultrafast high-temperature sintering (UHS) is an effective method for rapidly densifying ZrB2 powders. The final grain size increases with longer sintering duration. X-ray diffraction and energy-dispersive spectroscopy show crystalline phase and compositional uniformity in ZrB2 after UHS.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
JiaNan Wang, ZhiQiang Li, YongZheng Zhu, Yao Liang, Yan Cui, HuaLong Tao, Bo Song, Alexander Nikiforov, ZhiHua Zhang
Summary: First-principles calculations were performed to investigate the crystal structure, electronic structure, and ion diffusion of sulfur-doped Li2FeSiO4. The results showed that sulfur doping can improve the electronic conductivity and reduce the energy barrier for ion diffusion.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Xiaodi Dai, Serdar Aydin, Mert Yuecel Yardimci, Gunter Reekmans, Peter Adriaensens, Geert De Schutter
Summary: This study investigates the rheological behavior, solidification process, and nanostructure changes of sodium hydroxide-activated slag (NH-AAS) and sodium silicate-activated slag (SS-AAS) pastes over time. The results show that NH-AAS and SS-AAS release similar heat and reach a similar reaction degree at their initial setting times, but have different gel structures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yanliang Ji, Simon Becker, Zichen Lu, Alexander Mezhov, Regine von Klitzing, Schmidt Wolfram, Dietmar Stephan
Summary: This study reveals the significant influence of resting time on the rheological properties of cement suspensions, which is closely related to non-absorbed polycarboxylate superplasticizers (PCEs) size variation. Adsorbed PCE during resting tends to bridge particles instead of dispersing them, leading to an increased yield stress.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yifeng Huang, Xin Wang, Yinchang Ma, Xiang Lv, Jiagang Wu
Summary: This study investigates the effect of K/Na ratio on the phase structure, ferroelectric domains, and piezoelectric properties of potassium sodium niobate (KNN)-based ceramics. It reveals that high Na+ content leads to large ferroelectric domains, while high K+ content results in local polarity heterogeneity and distinct dielectric relaxational behavior. The balanced local polarity and stress heterogeneities contribute to improved piezoelectricity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zun Xia, Yedong Rong, Hao Li, Ye Dong, Hongbo Yu, Jie Xu, Xiuhui Wang, Jinlong Yang
Summary: This study presents the synthesis of hollow MgAl2O4 particles in situ within porous ceramics, resulting in volume expansion and the formation of a hierarchical pore structure, leading to a significant improvement in compressive strength.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Honglong Wang, Zhiguo Sun, Faming Xia, Chenguang Yang, Xiaoguang Wang, Jintang Li, Linxu Jiang
Summary: In this study, the micro-geometry morphology variation and microstructural transformation mechanism of muscovite crystals under electron beam irradiation were explored. The results revealed the instability of the muscovite lattice under irradiation, as well as the expansion and shrinkage of the lattice with increasing dose. The study also identified changes in chemical structure and other mechanisms involved. These findings are significant for the design of radiation-resistant silicate materials and the manufacturing of electronic components used in the aerospace industry.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)