Article
Materials Science, Multidisciplinary
Zheyi An, Shanshan Xie, Petr Ondrejkovic, Pavel Marton, Esther de Prado, Hiroko Yokota, Wei Ren, Zuo-Guang Ye, A. M. Glazer, Marek Pasciak, Nan Zhang
Summary: This study systematically investigates the structural properties of PbZr1-xTixO3 and reveals a complex phase coexistence near the antiferroelectric-ferroelectric phase boundary. It confirms a delicate balance between two crystal structures at the boundary, which can be disrupted by slight changes in concentration or external stimuli. These findings provide valuable insights into the antiferroelectric-ferroelectric competition and the design of alternative materials for energy storage and conversion.
Article
Chemistry, Physical
Rebecca Cervasio, Yoann Peperstraete, Thomas Maroutian, Raphael Haumont, Marine Verseils, Jean-Blaise Brubach, Robert Tetot, Jerome Creuze, Pascale Roy, Emilie Amzallag
Summary: Perovskites lead zirconium titanate (PZT) is a solid solution with strong piezoelectric properties. This study combines infrared absorption spectroscopy and density functional theory to investigate PZT films. The results provide insights into the polar modes and temperature phase transition of PZT films, as well as the potential for studying other solid solution materials.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
M. Sepliarsky, R. Machado, S. Tinte, M. G. Stachiotti
Summary: Recently, there have been discussions about the possibility of a low-temperature noncubic phase in BaZrO3 and its impact on physical properties. In this study, we investigated the behavior of the cubic phase of BaZrO3 using a shell model developed from ab initio calculations and molecular dynamics simulations. Our analysis reveals that the oxygen octahedra in the cubic phase have minimal distortion, exhibit rotation angles with significant amplitudes, are correlated with their closest neighbors in an antiferrodistortive manner, and form unstable domains over time. These findings support the existence of nanoregions with short-range ordering in cubic BaZrO3 and suggest that they can exist regardless of structural phase transitions at lower temperatures.
Article
Materials Science, Ceramics
Nikolay S. Yuritsyn, Vladimir M. Fokin, Juern W. P. Schmelzer, Alexander S. Abyzov, Alisson M. Rodrigues
Summary: This paper investigates the effect of temperature change rates on the glass transition temperature and the width of the glass transition interval through extensive experimental and theoretical studies. The results show that increasing the initial glass density leads to an increase in the transition temperature and a decrease in the transition interval width. A theoretical model is developed that successfully describes the variations in density and transition temperature and interval width during annealing and subsequent heating.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Valeri Petkov, Yang Ren
Summary: The study reveals that the reversible transition between the polar 1T' and nonpolar T-d phases of MoTe2 at 240K is macroscopically first order but locally not. The gradual evolution of the intermixing ratio for the two sequences near the transition temperature may be one of the reasons behind the unusual electronic properties of MoTe2.
Article
Multidisciplinary Sciences
Xinhui Li, Shan He, Yanda Jiang, Jian Wang, Yi Yu, Xiaofei Liu, Feng Zhu, Yimei Xie, Youyong Li, Cheng Ma, Zhonghui Shen, Baowen Li, Yang Shen, Xin Zhang, Shujun Zhang, Ce-Wen Nan
Summary: Polymer nanocomposites with optimized interfacial structures between nanoparticles and polymers can greatly enhance the material properties. In polar polymers, two interfacial layers, namely an inner bound polar layer and an outer polar layer, are observed around nanoparticles. This bilayer structure can significantly enhance the polarity-related properties of polymer nanocomposites.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Ebube E. Oyeka, Michal J. Winiarski, Maurice Sorolla, Keith M. Taddei, Allen Scheie, Thao T. Tran
Summary: Magnetic polar materials exhibit a wide range of physical properties due to their lack of space inversion symmetry and presence of unpaired electrons, enabling asymmetric DM exchange interactions supported by spin-orbital and electron-lattice coupling. By studying two magnetic polar materials, it was found that they have different crystal structures but crystallize in the same polar and chiral space group, showing different electric polarization directions. The observed phase transition in one material but not the other suggests the important role of spin-orbit coupling in influencing the magnetic interactions.
INORGANIC CHEMISTRY
(2021)
Article
Engineering, Chemical
Shotaro Nishitsuji, Toshiki Sato, Masaru Ishikawa, Takashi Inoue, Hiroshi Ito
Summary: The effects of annealing conditions and molecular weight on the energies required for cracking and plastic deformation were investigated. It was found that annealing reduced the energy required for plastic deformation, while the energy required for cracking remained the same. Additionally, increasing the molecular weight increased both the energy required for plastic deformation and cracking.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Polymer Science
Hyeonji Lee, Seongin Hong, Hocheon Yoo
Summary: The study found that the fluoropolymer Cytop has p-doping effects on tungsten diselenides (WSe2), boosting hole current in Cytop-WSe2 field-effect transistors (FETs). Analysis using atomic force microscopy and Raman spectroscopy revealed the doping mechanism. Cytop also reduces electrical instability by preventing adsorption of ambient molecules on the WSe2 surface.
Article
Materials Science, Multidisciplinary
Tianyu Li, Wenjun Cao, Pengfei Chen, Jinsong Wang, Chunchang Wang
Summary: The study shows that the two-step sintering method for preparing pure AgNbO3 lead-free antiferroelectric ceramics results in smaller grain size, dense and homogeneous microstructure. Additionally, it significantly enhances the breakdown electric field strength and energy storage performance of the ceramics.
JOURNAL OF MATERIALS SCIENCE
(2021)
Review
Nutrition & Dietetics
Hitoshi Ozawa, Taiki Miyazawa, Teruo Miyazawa
Summary: Population aging is a pressing issue globally due to increasing numbers of elderly individuals and rising social security costs. Cognitive decline in the elderly is a serious problem that requires attention in future care. Dietary patterns may play a role in improving age-related cognitive decline.
Review
Materials Science, Multidisciplinary
Raksan Ko, Dong Hyun Lee, Hocheon Yoo
Summary: This study investigates the annealing effects of various dopants, time, and ambient conditions on the material properties of TMDCs, including crystal quality, defect density, carrier mobility, electronic properties, and energy levels within the bandgap.
Article
Materials Science, Ceramics
Yi Xue, Guo Pu, Mingming Yu, Sheng Chen, Lin Gan, Liwei Lin, Chi Yang, Zhijun Wang, Haomin Wang, Zhangyi Huang, Yihan Wang, Kun Zhang
Summary: This study investigates the effects of air annealing on the microstructure, components, and mechanical properties of ceramic composite coatings. The results show that annealing below 600 degrees C does not visibly alter the phase-structure and superficial characteristics of the coatings, while the mechanical properties improve due to the growth of oxide grains. Annealing at 750 degrees C leads to the formation of uniform and refined nanoparticles on the coating surface, which effectively enhances the mechanical properties. Annealing at 850 degrees C, however, causes the enlargement of precipitated nanoparticles and the generation of micro-defects, resulting in a drastic morphological evolution, an increase in surface roughness, and a significant decrease in mechanical properties.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Geul Han Kim, Yoo Sei Park, Juchan Yang, Myeong Je Jang, Jaehoon Jeong, Ji-Hoon Lee, Han-Saem Park, Yong Ho Park, Sung Mook Choi, Jooyoung Lee
Summary: A copper-cobalt oxide nanosheet electrode was synthesized by electrodeposition and annealing, showing higher OER activity and stability compared to other materials.
Article
Materials Science, Multidisciplinary
G. Subias, J. Blasco, V. Cuartero, S. Lafuerza, L. Simonelli, G. Gorni, M. Castro, J. Garcia
Summary: We investigated the temperature dependence of Mn local structure in A-site ordered RBaMn2O6 perovskites and their disordered counterparts R0.5Ba0.5MnO3 using XES and XAS. The results show that the MnO6 octahedron in LaBaMn2O6 remains regular at all temperatures, while a local distortion develops with decreasing R ionic radius in the ordered samples NdBaMn2O6, SmBaMn2O6, and YBaMn2O6. Charge segregation between nonequivalent Mn sites is confirmed in the polar phase of Sm and Y ordered samples. The study suggests a displacive mechanism for the charge-localization and polar transitions in Nd and Sm ordered samples, while a combination of displacive and order-disorder contributions is revealed for YBaMn2O6.
Review
Acoustics
Elisa Mercadelli, Carmen Galassi
Summary: Ferroelectric ceramics are technologically important materials used in various devices, and introducing porosity can tune their functional properties. The most widely used processing techniques include replica technique, direct foaming, sacrificial template method, and additive manufacturing, providing effective and practical production strategies for the development of porous PZT-based materials for specific applications.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2021)
Article
Materials Science, Ceramics
Marco Mariani, Ruben Beltrami, Paolo Brusa, Carmen Galassi, Raffaele Ardito, Nora Lecis
Summary: Additive manufacturing of ceramics is still in its early stages, but the development of various techniques for custom production has led to the creation of high-performance devices. Components made from alumina using binder jetting 3D printing have shown high green relative density values and excellent mechanical properties, with a final density of up to 75.4% achieved through extended sintering.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Francesco Cordero, Floriana Craciun, Anna Maria Paoletti, Gloria Zanotti
Summary: The study analyzed the influence of water on the structural stability and transformations of MAPI and FAPI through spectroscopic techniques, revealing that interstitial water can affect the phase transitions in the perovskite materials.
Article
Chemistry, Physical
M. Vijatovic Petrovic, F. Cordero, E. Mercadelli, E. Brunengo, N. Ilic, C. Galassi, Z. Despotovic, J. Bobic, A. Dzunuzovic, P. Stagnaro, G. Canu, F. Craciun
Summary: The flexible lead-free piezoelectric composite films prepared by hot pressing showed promising performance in efficiently and safely powering small-scale electronic devices using mechanical energy. With increasing active phase content, the permittivity and elastic modulus increased, demonstrating excellent properties for energy storage and energy harvesting applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Joaquin Yus, Juan Antonio Escribano, Antonio Javier Sanchez-Herencia, Carmen Galassi, Begona Ferrari
Summary: In this study, we successfully prepared TiN suspensions for inkjet printing and evaluated the ink properties and jetting process. After sintering, the hardness analysis of the coated discs showed values ranging from 4 to 7 GPa, depending on the grid design.
Article
Chemistry, Multidisciplinary
Maria Grazia Betti, Elena Blundo, Marta De Luca, Marco Felici, Riccardo Frisenda, Yoshikazu Ito, Samuel Jeong, Dario Marchiani, Carlo Mariani, Antonio Polimeni, Marco Sbroscia, Francesco Trequattrini, Rinaldo Trotta
Summary: The adsorption of deuterium on nanoporous graphene reveals a homogeneous distribution and the formation of hybrid bonds. This study provides an efficient strategy for obtaining high-quality semiconducting graphane.
Article
Engineering, Electrical & Electronic
Emanuele Migliori, Elisa Mercadelli, Ruben Beltrami, Marco Mariani, Carlo Baldisserri, Carmen Galassi, Nora Lecis
Summary: A new strategy is presented to produce lead-free KNN piezoceramics with reliable and improved piezoelectric performance. By altering the synthesis route and adding specific powders, the crystal phase, microstructure and piezoelectric properties of the sintered pellets can be influenced, resulting in high piezoelectric charge constant values.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Crystallography
Francesco Cordero, Floriana Craciun, Francesco Trequattrini, Simona Ionita, Daniel Lincu, Raul-Augustin Mitran, Victor Fruth, Simona Brajnicov, Antoniu Moldovan, Maria Dinescu
Summary: We investigated the dielectric and anelastic spectra of molecular piezoelectric materials TMCM-MnCl3 and TMCM-Mn0.95M0.05Cl3. The dielectric permittivity decreases at the structural transition temperature, indicating the formation of ferroelectric domains. Elastic anomalies also occur, showing the improper character of the ferroelectric transition. Thermally activated relaxation processes are observed below room temperature, attributed to point defects such as Cl vacancies and their complexes with TMCM vacancies. Cu and Fe substitutions enhance the losses attributed to domain wall relaxation. Water condensation in the powders compacted by cold pressing is observed. The piezoelectric activity of the films is assessed by PFM.
Article
Engineering, Multidisciplinary
Floriana Craciun, Francesco Cordero, Elisa Mercadelli, Nikola Ilic, Carmen Galassi, Carlo Baldisserri, Jelena Bobic, Paola Stagnaro, Giovanna Canu, Maria Teresa Buscaglia, Adis Dzunuzovic, Mirjana Vijatovic Petrovic
Summary: Ultrasound energy harvesting has emerged as a promising technique for wireless power supply of implanted medical devices. This study reports on bio-compatible NBT-BT/PVDF flexible composites with high piezoelectric response in the ultrasonic range. The results show that these composites have enhanced high frequency piezoelectric response and high energy density harvested from an ultrasound source.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Evgeniy Dul'kin, Michael Roth, Floriana Craciun, Carmen Galassi
Summary: 9/65/35 PLZT relaxor was investigated under a biased electric field using the acoustic emission method. It was observed that the temperature at which the dielectric constant reaches its maximum forms a V-shape and is completely within the ergodic phase. Additionally, the threshold electric field was found to be approximately the same as that in PMN-0.24PT and PFN-0.02PT relaxors. The possible explanation for these phenomena is discussed based on the properties of incorporated ions.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2023)
Correction
Materials Science, Multidisciplinary
F. Cordero, F. Trequattrini, F. Craciun, C. Galassi
Correction
Materials Science, Multidisciplinary
F. Cordero, F. Craciun, F. Trequattrini, C. Galassi, P. A. Thomas, D. S. Keeble, A. M. Glazer
Article
Physics, Multidisciplinary
Francesco Cordero, Francesco Trequattrini, Paulo Sergio da Silva Jr, Michel Venet, Oktay Aktas, Ekhard K. H. Salje
Summary: Elastic softening in Ba1-xSrxTiO3 paraelectric phases is most pronounced near the transition temperatures and gradually decreases during heating, extending to the highest measured temperature for Ba-rich compounds. The excess compliance of the precursor softening follows a power law relationship with temperature, with different characteristic exponents ranging from 1.5 in SrTiO3 to 0.2 in BaTiO3. The softening is described by extremely low Vogel-Fulcher energies, indicating a change from a displacive to a weakly order-disorder character of the elastic precursor. The high-temperature elastic properties of these materials are significantly affected by precursor softening, as the elastic softening remains at about 33% of the unsoftened Young's modulus even at temperatures as high as 750 K in BaTiO3.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Engineering, Chemical
Francesco Trequattrini, Oriele Palumbo, Silvano Tosti, Alessia Santucci, Annalisa Paolone
Summary: This study aims to investigate the isotope effect of deuterium on the commercial Pd77Ag23 alloy, showing a clear inverse isotope effect where the equilibrium pressure of the Pd-Ag-D system is higher than that of Pd-Ag-H by a factor of approximately 2, and the solubility of deuterium is about half that of hydrogen. The results provide practical insights for applications operating above 200 degrees C.