Article
Chemistry, Inorganic & Nuclear
M. Haydoura, F. Marlec, C. Le Paven, R. Benzerga, L. Le Gendre, F. Chevire, F. Tessier, R. Seveno, A. Sharaiha
Summary: The structural and dielectric properties of thin films produced by reactive radiofrequency sputtering of a (Sr2Ta2O7)(100-x) (La2Ti2O7)(x) target with x = 1.65 were studied. It was found that the highest permittivities and tunabilities are associated with the pure and fully textured films. This was achieved for a 900 nm thick film deposited at T-s = 850 degrees C.
SOLID STATE SCIENCES
(2021)
Article
Crystallography
Hicham Es-soufi, M. I. Sayyed, Aljawhara H. Almuqrin, Raman Rajesh, Alan Rogerio Ferreira Lima, Hssain Bih, Lahcen Bih
Summary: Dielectric ceramics have attracted much attention due to their low dielectric loss and high permittivity values, making them suitable for downsizing and use in various electronic circuits. This study focuses on the substitution of W6+ with Mo6+ in the Ba0.54Na0.46Nb1.29W(0.37-x)MoxO5 system and its impact on the structural and dielectric features of the crystalline phases. The crystalline phases were prepared using solid-state reaction method and analyzed through XRD, Raman, and dielectric techniques.
Article
Chemistry, Physical
V Paul-Boncour, K. Provost, T. Mazet, A. N'Diaye, E. Alleno, F. Couturas
Summary: At different temperatures, the structures and magnetic properties of Y0.9Gd0.1Fe2Hx hydrides change sequentially. Above 300K, they undergo a first-order transition and exhibit negative and positive magnetic entropy variations. The proposed structural and magnetic phase diagram provides a better understanding of the properties of these hydrides.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Karolina Milewska, Michal Maciejewski, Marcin Lapinski, Anna Synak, Miroslaw Behrendt, Wojciech Sadowski, Barbara Koscielska
Summary: The B2O3-Bi2O3-AlF3 glass system doped with Eu3+, Tb3+, Tm3+ and triply doped with Eu3+/Tm3+/Tb3+ ions in different molar ratios were successfully synthesized. The glass matrix consists of [BO3] and [BO4] structural units, and AlF3 was also present. The luminescence spectra intensity increased with the presence of 10 mol% of AlF3, and the emitted color can be tunable by varying the excitation wavelength and sample composition. The proposed glass system shows potential as color-tunable phosphors in LEDs.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Applied
Yongjie Yin, Fei Liu, Xiangyu Mao, Wei Wang
Summary: An improved technique was used to prepare ceramic samples of Bi5.75R0.25Fe1.4Ni0.6Ti3O18 with a five-layer Aurivillius phase, exhibiting both ferroelectric and magnetic properties. With an increase in the radius of the A-site ions, the ferroelectric phase transition temperature decreases, while the magnetic phase transition temperature fluctuates.
JOURNAL OF RARE EARTHS
(2022)
Article
Chemistry, Physical
Payel Aich, Shreya Das, Shuvajit Halder, Carlo Meneghini, Desheng Fu, Vasudeva Siruguri, Som Datta Kaushik, Mitsuru Itoh, Tanusri Saha-Dasgupta, Sugata Ray
Summary: We propose a novel approach to achieve multiferroicity in a single phase by engineering the anionic network and creating local geometric distortions in fluorinated, vacancy-ordered brownmillerite Ca2Mn2O5-xFy. The system exhibits both ferroelectricity and an antiferromagnetic order above room temperature, pointing toward a new route to multiferroicity through anion mixing.
CHEMISTRY OF MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Sonia Rani, Ompal Singh, Shalu Kaushik, Pooja Sharma, Ashish Agarwal, Sujata Sanghi
Summary: The effect of Dy3+ ion substitution on the structural, dielectric, and magnetic behavior of BiFeO3 ceramics prepared via the solid-state route has been investigated. The substitution of Dy3+ ion with Bi3+ results in a phase transformation and a reduction in crystallite size. High-temperature transient interaction between oxygen vacancies and Fe3+/Fe2+ ions was observed. The addition of Dy improves the magnetic and dielectric properties, making BiFeO3 a suitable choice for data storage media.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Wen-Guang Li, Yun-Dan Gan, Zhi-Xin Bai, Xing-Han Li, Fu-Sheng Liu, Zheng-Tang Liu, Qi-Jun Liu, Dan Hong, Xiang-Hui Chang
Summary: This study investigated the structural, electronic, and vibrational properties of solid carbon dioxide at high pressure using first-principles calculations. The results show good agreement with experimental values, including phase diagrams and vibrational spectra.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Anita D. Souza, Jayaprakash Sahoo, Megha Vagadia, Sudhindra Rayaprol, Lozil Denzil Mendonca, Mamatha D. Daivajna
Summary: This study investigates the effects of particle size reduction on the structural and magnetic properties of Pr0.6-xBixSr0.4MnO3 (x = 0.10 and 0.25) nanoparticles prepared using a high-energy planetary ball mill. The results show that reducing particle size can effectively decrease the transition temperature and net magnetization.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Stamatios Strikos, Boby Joseph, Frederico G. Alabarse, George Valadares, Deyse G. Costa, Rodrigo B. Capaz, Mohammed ElMassalami
Summary: This study investigates phase transitions in SrAl2Si2 crystal under different pressure and temperature conditions, establishing a preliminary P-T diagram through theoretical and empirical analyses. The results show a relatively low critical pressure for the α-to-β transition, but a high activation barrier between the α phase and metastable β phase.
INORGANIC CHEMISTRY
(2021)
Article
Polymer Science
Konstantin V. Pochivalov, Andrey V. Basko, Anna N. Ilyasova, Tatyana N. Lebedeva, Mikhail Y. Yurov, Sergei V. Bronnikov
Summary: In this study, a new method for plotting ternary phase diagrams of a semicrystalline polymer-solvent-nonsolvent mixture was proposed. The complete ternary phase diagram of PVDF-DMAc-water was plotted for the first time. The analysis of NIPS mechanism was confirmed through direct microscopic observation and SEM analysis of the membranes obtained.
Article
Chemistry, Physical
Diwen Liu, Huihui Zeng, Huan Peng, Rongjian Sa
Summary: In this research, comprehensive theoretical calculations were conducted to investigate the structural features, stability, mechanical behavior, optoelectronic properties, and photovoltaic performance of inorganic Au-based halide perovskites. The study revealed that certain compounds exhibit high efficiency and suitable band gaps for single-junction solar cells, as well as high absorption coefficients in the visible region.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
R. Selmi, W. Cherif, A. R. Sarabando, N. M. Ferreira, L. Ktari
Summary: Polycrystalline compounds were synthesized using the ceramic method and shown to have magnetic field tunability. The samples undergo a paramagnetic-ferromagnetic phase transition within a certain temperature range, and the transition temperature increases with the increase of La doping concentration.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Ceramics
Feng Li, Mingsheng Long, Chunchang Wang, Jiwei Zhai
Summary: In this study, relationships between phase structure, dielectric, and ferroelectric performances in the (Pb, Ba)ZrO3 system were meticulously explored to clarify its complex characteristics. The observed ferroelectric behaviors were found to be substantially influenced by domain switching, and a phase diagram was constructed to guide compositional design in this system.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Sushrisangita Sahoo, Abhinav Yadav, K. P. Andryushin, P. K. Mahapatra, R. N. P. Choudhary
Summary: The (Gd1-xBax)(Fe1-xTix)O-3 ceramics with different compositions (x = 0.0-0.4) were systematically investigated for their structural transformation, ferro-paraelectric and magnetic ordering induced dielectric phase transitions, multiferroic properties, relaxation and conduction mechanisms. The chemical route was used for material synthesis. Rietveld refinement revealed a structural transformation from orthorhombic to mixed phase for x > 0.2. The analysis of FESEM micrographs indicated a decrease in grain size with the increase in BT in the composition. Dielectric anomalies were explained based on ferroelectric-paraelectric phase transition, polarization induced by a spin reorientation, and antiferromagnetic ordering. The multiferroic properties were studied through various plots. The compositions x = 0.1-0.3 showed improved magnetic properties, making them suitable for spintronic devices. The composition x = 0.3 exhibited a maximum magneto-electric coupling coefficient of 4.77 mV/cm.Oe, making it suitable for magnetoelectric coupling devices.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Greta Cavazzini, Francesco Cugini, Davide Delmonte, Giovanna Trevisi, Lucia Nasi, Semih Ener, David Koch, Lara Righi, Massimo Solzi, Oliver Gutfleisch, Franca Albertini
Summary: This study presents a top-down method using ball-milling techniques to prepare micro-meter and sub-micro-meter sized particles of Ni50Mn30Ga20 and Ni50Mn18.5Cu6.5Ga25. The research shows that lattice defects and atomic disorder induced during milling have a detrimental effect on magnetic properties and magneto-structural phase transitions, but can be recovered by subsequent annealing. Furthermore, tuning the particle size can improve magnetic properties, such as phase homogeneity, thermal hysteresis reduction, and saturation magnetization increase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
A. Diaz-Garcia, L. M. Moreno-Ramirez, J. Y. Law, F. Albertini, S. Frabbrici, V Franco
Summary: The TFORC technique was used to study the thermal hysteresis of two magnetocaloric Heusler alloys with similar compositions but different martensitic transition temperatures, leading to varying TFORC distributions. The asymmetry of the martensitic transformation upon cooling and heating has significant effects on the TFORC distributions. Experimental results were compared to a transformation model to separate contributions from magneto-structural and thermomagnetic behaviors, revealing the origins of different distribution features.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
Giulia Spaggiari, Francesco Pattini, Danilo Bersani, Davide Calestani, Andrea De Iacovo, Edmondo Gilioli, Francesco Mezzadri, Andrea Sala, Giovanna Trevisi, Stefano Rampino
Summary: Sb2Se3, (ASe) thin-films were successfully deposited in photovoltaic solar cells using radio frequency magnetron sputtering deposition technique, achieving high quality crystallization and vertical alignment without the need for additional selenization process. The orientation of ribbons on the substrate was found to strongly affect the performance of Sb2Se3 solar cells, particularly the short circuit current density (J (sc)). By depositing ASe on Mo, a photovoltaic efficiency of 0.24% and a J (sc) of 5 mA cm(-2) were obtained, while a J (sc) of 27 mA cm(-2) and an efficiency of 2.36% were achieved in superstrate configuration.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Maria J. Pereira, Tiago Santos, Rafael Correia, Joao S. Amaral, Vitor S. Amaral, Simone Fabbrici, Franca Albertini
Summary: The study investigated the MCE of a bulk Ni44Co6Mn30Ga20 sample at the microscale using infrared thermography. It found that around the reverse martensitic transformation, an inverse MCE was observed with strong spatial inhomogeneity, while this behavior was not observed during the direct martensitic transformation on cooling. This reveals significant novelty in the manifestation of MCE at the microscopic scale associated with phase dynamics.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Physics, Condensed Matter
Linda Sederholm, Steven D. Conradson, Theodore H. Geballe, Chang-Qing Jin, Andrea Gauzzi, Edmondo Gilioli, Maarit Karppinen, Gianguido Baldinozzi
Summary: Traditional understanding suggests that superconductivity in cuprate materials would disappear with excess doping, but experimental results show otherwise. Experiments with cuprates prepared by high-pressure oxygenation indicate that the superconducting transition temperature Tc continues to increase beyond the critical doping level of 0.3 to over 0.6, pointing towards a need for revision of the theoretical basis for high-temperature superconductivity.
Article
Chemistry, Physical
Simone Fabbrici, Francesco Cugini, Fabio Orlandi, Nicola Sarzi Amade, Francesca Casoli, Davide Calestani, Riccardo Cabassi, Greta Cavazzini, Lara Righi, Massimo Solzi, Franca Albertini
Summary: This study investigates the Curie transition of austenitic Ni-Mn-In full Heusler compounds by replacing Mn atoms with Fe or Cu. It is found that Fe and Cu modify the magnetic moments and interactions, resulting in changes in the Curie temperature and saturation magnetization of the compound. The study successfully synthesizes quinary compounds with tunable Curie temperature and high saturation magnetization, highlighting a promising strategy for designing regenerators for room temperature magnetocaloric applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Greta Cavazzini, Francesco Cugini, Francesco Puglielli, Simone Fabbrici, Davide Delmonte, Giovanna Trevisi, Lucia Nasi, Lara Righi, Semih Ener, Lukas Pfeuffer, David Koch, Oliver Gutfleisch, Franca Albertini, Massimo Solzi
Summary: Microparticles of Ni45.7Mn36.6In13.5Co4.2 were prepared using different grinding methods and annealing treatments were applied to recover the original martensitic transition and magnetic properties. The particle size was significantly reduced after milling and the morphology, crystal structure, and magnetic properties were strongly influenced by milling temperature, time, and medium. High-temperature annealing treatments could recover both magnetic and magneto-structural phase transitions. The study highlights the importance of microstructural features, atomic order, and chemical homogeneity in determining the magneto-structural properties of the NiMnInCo compound.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Danilo Marchetti, Francesca Portone, Francesco Mezzadri, Enrico Dalcanale, Mauro Gemmi, Alessandro Pedrini, Chiara Massera
Summary: The dynamic behavior of supramolecular organic frameworks (SOFs) based on TPM organic tecton has been studied. The SOF undergoes a reversible single-crystal-to-single-crystal transformation when exposed to organic solvents, resulting in changes in structure and fluorescence. The selectivity of the transformation is dictated by the fitting of the guest in the expanded SOF.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Multidisciplinary Sciences
Fabio Orlandi, Davide Delmonte, Gianluca Calestani, Enrico Cavalli, Edmondo Gilioli, Vladimir V. Shvartsman, Patrizio Graziosi, Stefano Rampino, Giulia Spaggiari, Chao Liu, Wei Ren, Silvia Picozzi, Massimo Solzi, Michele Casappa, Francesco Mezzadri
Summary: This study reports a previously unrecognized room temperature multiferroic material, BaFe2O4. Experimental results demonstrate its polar crystal structure and antiferromagnetic behavior, and the polarization is switchable as observed through piezo force microscopy and electrical measurements. The findings are of great significance for the discovery and application of new multiferroic materials.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Elena Del Canale, Lorenzo Fornari, Chiara Coppi, Giulia Spaggiari, Francesco Mezzadri, Giovanna Trevisi, Patrizia Ferro, Edmondo Gilioli, Massimo Mazzer, Davide Delmonte
Summary: We have developed a new method to synthesize bulk indium nitride and bulk gallium nitride using a solid-state chemical reaction under high-pressure/high-temperature conditions. The reactions involve binary oxides and highly reactive nitrogen sources without the use of gases or solvents. The obtained materials are pure and can be produced in significant quantities for electronic and energy technologies.
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
F. Telesio, F. Mezzadri, M. Serrano-Ruiz, M. Peruzzini, F. Bisio, S. Heun, F. Fabbri
Summary: This study demonstrated the transportation of visible light in nanometric niobium stripes coupled with a dielectric polymeric layer and utilizing the remotely-excited/detected Raman signal of black phosphorus as a probe. The light transport mechanism is attributed to the generation of surface plasmon polaritons at the Nb/polymer interface.
MATERIALS FOR QUANTUM TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
F. Cugini, S. Chicco, F. Orlandi, G. Allodi, P. Bonfa, V. Vezzoni, O. N. Miroshkina, M. E. Gruner, L. Righi, S. Fabbrici, F. Albertini, R. De Renzi, M. Solzi
Summary: This research demonstrates that a highly frustrated ferromagnetic phase can be achieved in a multisublattices cubic structure by fine-tuning the magnetic interactions, showcasing the engineering potential of magnetic interactions in metallic systems.
Article
Materials Science, Multidisciplinary
Fabio Orlandi, Arianna Lanza, Riccardo Cabassi, Dmitry D. Khalyavin, Pascal Manuel, Massimo Solzi, Mauro Gemmi, Lara Righi
Summary: The low-temperature structure of Bi0.68Ca0.32MnO3 shows an ordering of Mn cations in a stripe/chess-like pattern, along with the development of complex extended orbital molecules. This ordering results in the formation of short Mn-Mn distances and rearrangement of Mn-O bonds, leading to the generation of a spontaneous electrical polarization. Neutron data reveal a coexistence of a pseudo-CE long-range-ordered structure with reduced moment and short-range ferromagnetic correlations, indicating competition between charge, orbital, and magnetic degrees of freedom in this manganite system.
Article
Chemistry, Multidisciplinary
A. Portone, L. Bellucci, D. Convertino, F. Mezzadri, G. Piccinini, M. A. Giambra, V. Miseikis, F. Rossi, C. Coletti, F. Fabbri
Summary: By employing single crystalline graphene to modify the sulfurization dynamics of copper foil, large-area Cu9S5 crystals could be deterministically synthesized, enabling the epitaxial growth of layered materials with different crystalline symmetries and the synthesis of heterostructures with a large lattice constant mismatch.
NANOSCALE ADVANCES
(2021)
