Article
Chemistry, Physical
Jing Shi, Rizhuang Dong, Jiayi He, Daowei Wu, Wenchao Tian, Xiao Liu
Summary: This study investigated the structural, dielectric, and ferroelectric properties of lead-free ceramics based on the ternary system of BaTiO3 (BT). It was observed that the dopant concentration influenced the structural evolution from tetragonal to pseudocubic phase. The dielectric response showed diffusive peaks and relaxor behavior, indicating a transition from ferroelectric to relaxor state. The ceramics exhibited slim polarization hysteresis loops and electrical inhomogeneities caused by excessive dopant addition, leading to degraded electric breakdown strength. The oxygen vacancy hopping mechanism was proposed to explain the diffuse dielectric response at high dopant concentrations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Metallurgy & Metallurgical Engineering
Jesse Nii Okai Amu-Darko, Chen Zhang, Shahid Hussain, Samuel Leumas Otoo, Michael Freduah Agyemang
Summary: The environmentally-friendly relaxor ferroelectric ceramics were prepared and sintered, with Ba(Mg1/3Ta2/3)O-3 content affecting grain size and dielectric properties. Increasing BMT content led to improved dielectric performance and transition from ferroelectric to paraelectric phase.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Materials Science, Ceramics
Eva Kroell, Astita Dubey, Vladimir V. Shvartsman, Doru C. Lupascu
Summary: Lead-free relaxor compounds, BTZ-BZNb and BTZBZTa, were prepared by the solid-state method. Moderate doping enhances the relaxor behavior of BTZ while maintaining a large polarizability. The substitution with niobates seems to affect the lattice distortion more than tantalates.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Ye Zhao, Qian Wang, Jun-Hu Lv, Xian Zhao, Chun-Ming Wang
Summary: In this study, Y-modified BaTiO3 ceramics with different yttrium doping levels were prepared, and BT-2.5Y showed the highest electrocaloric effect performance. This indicates that BT-100xY ceramics have great potential for applications.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Z. Raddaoui, R. Brahem, A. Bajahzar, H. M. Albetran, J. Dhahri, H. Belmabrouk
Summary: The new perovskite BSTZO ceramic exhibits a tetragonal structure with conductivity spectra following the double Jonscher law. The conduction behavior is described by the Correlated Barrier Hopping model at low temperatures and the Non-overlapping Small Polaron Tunneling mechanism at high temperatures.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Ceramics
Fan Yang, Ying Chen, Xin Li, Wei Huang, Genshui Wang, Xianlin Dong
Summary: The study introduces a lead-free bulk ceramic with the addition of BNT, achieving higher polarization and relaxor behavior, thus improving energy storage properties and thermal stability.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Chen Zhang, Zixin Zhou, Zhuming Tang, Didier Ballo, Chun Wang, Gang Jian
Summary: The Sc2O3 doped Ba(Zr0.1Ti0.9)O-3 ferroelectric ceramics were investigated for their microstructure, domain structure, dielectric and ferroelectric properties. It was found that Sc2O3 doping decreased the grain size, while both 90 degrees and 180 degrees ferroelectric domains coexisted in the ceramics. The phase transition temperature and dielectric permittivity maximum decreased with increasing Sc2O3 content, but the relative dielectric constant temperature stability was improved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Amir Mahdi Molavi, Parvin Alizadeh
Summary: Multiferroic composite materials with one-dimensional core-shell structure were successfully synthesized by electrospinning for the first time, and the influence of different synthesis routes on the properties of the composite fibers was investigated, with the second method showing higher saturation magnetization and dielectric constant.
MATERIALS CHARACTERIZATION
(2021)
Article
Engineering, Electrical & Electronic
S. Nagamani, J. Nitchal Kiran, B. Siva Basivi Reddy, B. Nageswara Rao, J. Anindhya Kiran, K. Sambasiva Rao
Summary: The gadolinium-doped SrBi2Nb2O9 ceramics were prepared and their structural and dielectric properties were studied. The results showed that the addition of gadolinium altered the structure and electrical properties of SrBi2Nb2O9, leading to a transition from ferroelectric to paraelectric behavior.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Environmental
Yang Li, Yi Liu, Mingyang Tang, Jingwen Lv, Fukang Chen, Quan Li, Yan Yan, Fei Wu, Li Jin, Gang Liu
Summary: A two-step strategy has been proposed in this study to enhance the energy storing performance of lead-free ferroelectric ceramics, which includes adjusting the ratio of chemical elements and optimizing the preparation process, and has been proven to significantly improve the energy storage performance, especially achieving superhigh energy storage density for a new ceramic material under high electric field.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Ceramics
Bo Yan, Kepi Chen, Linan An
Summary: Lead-free relaxor ferroelectric ceramics have been prepared and characterized. The ceramic with the composition of 0.85BNKT-0.15SMN shows the best overall performance with high energy storage density and efficiency, as well as excellent temperature and frequency stability.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Marzia Mureddu, Jose F. Bartolome, Sonia Lopez-Esteban, Maria Dore, Stefano Enzo, Alvaro Garcia, Sebastiano Garroni, Lorena Pardo
Summary: Lead-free (Ba0.92Ca0.08)(Ti-0.95 Zr-0.05) O-3 (BCZT) ceramics were successfully prepared using solid-state route and low-temperature synthesis. The activation and homogenization process significantly decreased the perovskite formation temperature. The elimination of secondary phases was achieved through a two-step sintering treatment, resulting in a pure phase BCZT ceramic with excellent electromechanical properties.
Article
Materials Science, Ceramics
S. A. N. Franca Junior, W. Acchar, S. L. A. Dantas, P. H. Chiberio, H. P. A. Alves, M. R. D. Bomio, F. V. Motta, F. Bohn, A. Ferreira, F. Vaz, M. A. Correa
Summary: We conducted a comprehensive investigation on the high-frequency dielectric properties of (ZrO2)100-x(BaTiO3)x heterostructures. By adjusting the content of BaTiO3, we could modify the dielectric constant of the resulting ceramic sheets. Our results demonstrated successful fabrication of heterostructured ceramic sheets and the ability to tailor the electric, structural, and dielectric properties of both ZrO2 and BaTiO3 materials. Furthermore, the evolution of the dielectric constant could be manipulated according to specific technological applications.
CERAMICS INTERNATIONAL
(2023)
Article
Energy & Fuels
Huayang Zhu, Sandrine Ricote, Robert J. Kee
Summary: This study develops a model that predicts the behavior of faradaic efficiency as a function of operating conditions for proton-conducting ceramic cells. The study focuses on a cell based on a BCZYYb membrane and predicts the effects of temperature, pressure, and gas compositions on the efficiency.
JOURNAL OF PHYSICS-ENERGY
(2022)
Article
Materials Science, Ceramics
Kiryl Zakharchuk, Aleksey Yaremchenko, Andrei Kovalevsky
Summary: Efficient use of barium-containing electrocatalysts for NOx decomposition in electrochemical solid oxide cells requires good chemical compatibility and porous electrolytes. This study focuses on processing guidelines for BaZr0.85Y0.15O3 ceramics with cellular porosity using emulsification. The results show that the porosity and permeability of the ceramics depend on the surfactant and paraffin content.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Blessing N. Ezealigo, Roberto Orru, Catherine Elissalde, Helene Debeda, U-Chan Chung, Mario Maglione, Giacomo Cao
Summary: The structural and dielectric properties of BTZ ceramics prepared using SPS from powders obtained via SHS are strongly influenced by the sintering temperature, with post-annealing leading to phase transitions. SPS ceramics with compositions 0.05 < x < 0.20 sintered at 1200 degrees C exhibit standard ferroelectric behavior. The BTZ ceramic with 5% Zr shows the best dielectric permittivity and piezoelectric properties among the compositions studied.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Maria Letizia De Marco, Taizhi Jiang, Jie Fang, Sabrina Lacomme, Yuebing Zheng, Alexandre Baron, Brian A. Korgel, Philippe Barois, Glenna L. Drisko, Cyril Aymonier
Summary: This study demonstrates the synthesis of Mie-resonant core-shell particles with overlapping electric and magnetic dipole resonances in the visible spectrum, allowing for tuning of the relative position and intensity of these resonances. Coating high-index particles with low-index shells coalesces the dipoles while maintaining high scattering efficiency, leading to broadband forward scattering. This synthetic strategy opens up new possibilities for metamaterial fabrication with unprecedented control over visible light manipulation.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Ceramics
Thomas Herisson de Beauvoir, Zakaria Ghomari, Geoffroy Chevallier, Andreas Flaureau, Alicia Weibel, Catherine Elissalde, Fabrice Mauvy, Rachman Chaim, Claude Estournes
Summary: Yttria stabilized zirconia ceramics prepared by Flash-SPS exhibit rapid densification and high hardness, providing new opportunities for the fabrication of porous lightweight ceramics with good mechanical properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Christophe Daumont, Quentin Simon, Sandrine Payan, Pascal Gardes, Patrick Poveda, Mario Maglione, Beatrice Negulescu, Nazir Jaber, Jerome Wolfman
Summary: This study investigates the potential of BCTZ thin films for tunable ferroelectric capacitors, showing high performance achieved through the CPLD method. The results demonstrate that compounds close to (Ba0.84Ca0.16)(Ti0.8Zr0.2)O-3 exhibit the best performance, while a zone with compositions around (Ba0.91Ca0.09)(Ti0.81Zr0.19)O-3 show the best compromise between tuning ratio and figure of merit.
Article
Biochemical Research Methods
Gustavo Ochoa-Vazquez, Boris Kharisov, Ana Arizmendi-Morquecho, Anais Cario, Cyril Aymonier, Samuel Marre, Israel Lopez
Summary: A simple and low-cost continuous segmented-flow process for the synthesis of Ag and Au spherical-shaped nanoparticles is presented. The flow conditions have opposite effects on the synthesis of Ag and Au nanoparticles, with low residence times improving Ag nanoparticle production and high residence times improving Au nanoparticle synthesis yield and quality.
IEEE TRANSACTIONS ON NANOBIOSCIENCE
(2022)
Article
Chemistry, Physical
Anais Cario, Guillaume Aubert, Jean-Pierre Alcaraz, Jean-Pascal Borra, Nicolas Jidenko, Mathieu Barrault, Soleiman Bourrous, Victor Mocho, Francois Xavier Ouf, Samuel Marre, Philippe Cinquin, Cyril Aymonier
Summary: The study demonstrates that Supercritical Carbon Dioxide treatment meets the mandatory requirements for safe reuse of FFP2 respirators, effectively decontaminating spores and preserving filtration efficiency. This method is simple, cost-effective, and aligns with economic and sustainable development goals.
JOURNAL OF SUPERCRITICAL FLUIDS
(2022)
Article
Materials Science, Ceramics
Subhransu Subhasis Bhoi, Mathieu Duttine, U-Chan Chung, Michael Josse, Matthew R. Suchomel
Summary: The thermodynamic stability of Sn(II) under ambient conditions affects the densification of divalent tin based oxides. A low temperature electric field assisted processing route allows for densification up to 90% theoretical density for tin monoxide. The choice of starting precursor impacts processing parameters and resulting microstructure of the ceramic.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
M. I. Rua Taborda, E. Martin, U. C. Chung, S. Fourcade, C. Labrugere, D. Michau, G. Goglio, C. Elissalde
Summary: The recent development of low temperature sintering approaches has promising prospects for the global optimization of functional materials and multi-materials. These new processes utilize different densification mechanisms and have flexibility in terms of chemical reactivity. This study focuses on the densification of yttria stabilized zirconia (3Y-ZrO2) at a temperature below 900 degrees C by combining a transient chemical reactivity induced during the Cold Sintering Process with diffusion mechanisms activated during the Spark Plasma Sintering.
Article
Chemistry, Physical
Brian Dusolle, Veronique Jubera, Evgeniy S. Ilin, Patrick Martin, Gilles Philippot, Matthew R. . Suchomel, Bo B. Iversen, Samuel Marre, Cyril Aymonier
Summary: Extensive research on nanosized ZnO finds its optical properties challenging to control due to various possible defects producing emissions in the visible range. A low-temperature, supercritical-fluid-driven synthesis proposed by our group produces isotropic nanosized particles with a pure excitonic emission comparable to single crystals. This article reports the growth mechanism and optical properties of the excitonic emission, as well as its phonon coupling with the E2 high vibrational mode at liquid helium temperatures.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yazan Badour, Sylvain Danto, Mathieu Gonidec, Christine Labrugere, Matthew R. Suchomel, Gilles Philippot, Manuel Gaudon
Summary: By tuning the oxygen substoichiometry of WO3 nano-powders, the photochromic properties can be optimized. In addition, WO3-x thin films fabricated using the dip-coating method exhibit excellent UV photoresponse and photoelectric characteristics.
Article
Engineering, Chemical
Sandy Morais, Carole Lecoutre, Gilles Philippot, Guillaume Aubert, Olivier Nguyen, Anais Cario, Emeline Vidal, Zachary S. Campbell, Yves Garrabos, Mohamed Azaroual, Lukas Helfen, Dominique Bernard, Samuel Marre
Summary: In this study, X-ray laminography was used to monitor the evolution of a model 3D packed bed porous medium undergoing reactive flows. The obtained 3D images were utilized to compute fluid flow patterns and gain insights into dissolution mechanisms. This proof of concept study, conducted on controlled micromodels, has the potential to provide a deeper understanding of dissolution and precipitation processes in porous media at the microscale, which have implications for various industrial areas such as catalysis, geochemistry, energy, and waste storage in deep geological formations.
Article
Materials Science, Biomaterials
Vaishwik Patel, Linta Jose, Gilles Philippot, Cyril Aymonier, Talgat Inerbaev, Luke R. R. McCourt, Michael G. G. Ruppert, Dongchen Qi, Wei Li, Jiangtao Qu, Rongkun Zheng, Julie Cairney, Jiabao Yi, Ajayan Vinu, Ajay S. S. Karakoti
Summary: This study reveals the important role of the surface Ce4+/Ce3+ ratio in tuning the fluoride-assisted boost in the oxidase mimetic activity of nanoceria. Stoichiometric ceria shows higher activity compared to oxygen-deficient ceria, and fluoride ions significantly increase the oxidase mimetic activity. Based on these findings, the researchers successfully develop colorimetric assays for detecting fluoride ions and glutathione using nanoceria.
JOURNAL OF MATERIALS CHEMISTRY B
(2022)
Article
Materials Science, Multidisciplinary
Constance Toulouse, Danila Amoroso, Robert Oliva, Cong Xin, Pierre Bouvier, Pierre Fertey, Philippe Veber, Mario Maglione, Philippe Ghosez, Jens Kreisel, Mael Guennou
Summary: In this paper, the high pressure behavior of BaZrO3 is reexamined using first-principle calculations, Raman spectroscopy and x-ray diffraction. The cubic-to-tetragonal transition at 10 GPa is experimentally confirmed, while no evidence for other phase transitions is found up to 45 GPa, contradicting past reports. Density functional theory calculations show that the tetragonal phase becomes more stable with increasing pressure compared to phases with more complex tilt systems, ruling out the possibility of a second transition to another tilted phase at higher pressures, particularly the common orthorhombic Pnma structure.
Article
Chemistry, Inorganic & Nuclear
Marlene Palluel, Liza El Khoury, Nathalie Daro, Sonia Buffiere, Michael Josse, Mathieu Marchivie, Guillaume Chastanet
Summary: This study focuses on the polymorphism of the compound [Fe(Htrz)(2)trz](BF4) and the influence of synthetic parameters, presenting the crystal structure of polymorph II and discussing the differences between polymorphs. The resolution of the crystal structure of the [Fe(Htrz)(2)(trz)](PF6) analogue allows for the creation of a phase diagram and discussion on the effect of reaction conditions on particle size and properties.
INORGANIC CHEMISTRY FRONTIERS
(2021)
