A5067967187- Glass properties and applications
- Luminescence Properties of Advanced Materials
- Magnetic Properties and Synthesis of Ferrites
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Magnetism in coordination complexes
- Iron oxide chemistry and applications
- Multiferroics and related materials
- Magnetic properties of thin films
- Magnetic and transport properties of perovskites and related materials
- Perovskite Materials and Applications
- Advanced Condensed Matter Physics
- Organic and Molecular Conductors Research
- Metallic Glasses and Amorphous Alloys
- Magnetic Properties and Applications
- Magnetic Properties of Alloys
- Lanthanide and Transition Metal Complexes
- Physics of Superconductivity and Magnetism
- Metal complexes synthesis and properties
- Solid-state spectroscopy and crystallography
- Nuclear materials and radiation effects
- Superconductivity in MgB2 and Alloys
- Characterization and Applications of Magnetic Nanoparticles
- Iron-based superconductors research
- Spectroscopy and Laser Applications
University of Cagliari
2012-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari
2004-2024
Northwestern University
2023
Beijing Obstetrics and Gynecology Hospital
2017
Istituto Nazionale per la Fisica della Materia
1996-2004
Academy of Sciences of Moldova
1993
Institute for Microstructural Sciences
1993
University of Ottawa
1993
The aim of the present work is to highlight unique role anilato-ligands, derivatives 2,5-dioxy-1,4-benzoquinone framework containing various substituents at 3 and 6 positions (X = H, Cl, Br, I, CN, etc.), in engineering a great variety new materials showing peculiar magnetic and/or conducting properties. Homoleptic anilato-based molecular building blocks related will be discussed. Selected examples such materials, spanning from graphene-related layered intercalated supramolecular arrays,...
Magnetic double perovskite oxides have steadily emerged as an important class of functional materials. A clear understanding the complex interactions that govern magnetic behavior, and thereby, functionality in these mixed valence compounds, however, remains elusive. In this study, we show nanostructure forms compounds is at root their behavior. Using complementary experimental micromagnetic simulation results, uncovered polycrystalline Sm2CoMnO6, a typical oxide, established how drives its...
We report the detailed structural characterization and magnetic investigation of nanocrystalline zinc ferrite nanoparticles supported on a silica aerogel porous matrix which differ in size (in range 4-11 nm) inversion degree (from 0.4 to 0.2) as compared bulk has normal spinel structure. The samples were investigated by zero-field-cooling-field-cooling, thermo-remnant DC magnetization measurements, AC Mössbauer spectroscopy. nanocomposites are superparamagnetic at room temperature;...
Abstract Metal halide perovskites are maturing as materials for efficient, yet low cost solar cells and light‐emitting diodes, with improving operational stability reliability. To date however, most perovskite‐based devices contain Pb, which poses environmental concerns due to its toxicity; lead‐free alternatives of importance facilitate the development devices. Here, germanium‐based Ruddledsen–Popper series (CH 3 2 ) NH n −1 Ge Br +1 is investigated, derived from parent 3D ( = ∞) CH GeBr...
Photoluminescence (PL) of type III (high-purity wet synthetic) silica excited by a XeCl excimer laser (hν=4 eV) is reported. Time-resolved spectra show that PL band peaked at 1.9 eV can be induced the irradiation. This exhibits fast rise time (<20 ns) but decay several microseconds. The possible mechanisms photogeneration and photoexcitation defects related to this emission are discussed.
A new family of heterolepticanilate-based lanthanide MOFs (Ln III = Tb, Dy, Ho) has been obtained via the ancillary ligand synthetic strategy. Although three species are structurally isomorphous, only Dy-MOF exhibits SMM behaviour.
This work investigates nanostructured Ho0.5Ca0.5MnO3, considered a model system of the Ln0.5Ca0.5MnO3 series manganites with perovskite structures featuring small lanthanide (Ln) ions half-substituted by Ca ions. Here, we propose modified hybrid sol–gel–solid-state approach to produce multiple samples single batch, obtaining very high crystalline quality and ensuring same chemical composition, an average particle size in range 39–135 nm modulated on-demand controlled calcination process. Our...
Abstract Anomalous thermal transport of Cs 2 NaYbCl 6 double‐halide perovskite above room temperature is reported and rationalized. Calculations phonon dispersion relations scattering rates up to the fourth order in lattice anharmonicity have been conducted determine their effective dependence on temperature. These findings show that specific group velocities lifetimes increase if raised 500 K. This, combination with anharmonicity, provides microscopic mechanism responsible for conductivity...
We studied the temperature dependence of magnetization in an ensemble monodomain nanoparticles both with dc magnetometry and Mössbauer spectroscopy. The analytical form is given by complementary cumulative distribution function. This allows to determine blocking temperatures sample a fitting procedure. It possible calculate single spectrum two points thermoremanent curve, thus large reduction experimental work. method may be used for particles not too strong interactions, such happens Fe28...
FeCo-Al2O3 nanocomposite aerogels were studied by high-resolution electron microscopy, energy filtered transmission Mössbauer spectroscopy, and measurements of static magnetizations hysteretic behavior. The combined use such techniques provided insights on the formation bcc FeCo nanocrystalline particles inside alumina matrix, which is promoted thermal treatment under hydrogen flow parent aerogel. Sample characteristics as alloy composition crystallinity, influence matrix structural...
Accumulation of CH<sub>3</sub>NH<sub>3</sub><sup>+</sup> and Br<sup>−</sup> ionic species at the ferroelastic domain boundaries creates a polar electret state in hybrid perovskite CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> that mimics ferroelectric <italic>P</italic>(<italic>E</italic>) hysteresis loop.
Abstract A preparation method to simultaneously synthesize and consolidate bulk MgB 2 superconductors from Mg B commercial elemental powders by means of the spark plasma sintering technique is reported. The influence process parameters on dynamics as well product characteristics, determined transport magnetic measurements, investigated. superconducting properties obtained samples, particularly critical current density, are comparable or better than those corresponding other techniques. Thus,...
In order to analyse the effect of strain on magnetic properties narrow-band manganites, temperature and field dependent susceptibilities about 8.5 nm thick epitaxial Pr0.7Ca0.3MnO3 films, respectively grown (001) (110) SrTiO3 substrates, have been compared. For ultrathin samples SrTiO3, a bulk-like cluster-glass behaviour is found, indicative possible coexistence antiferromagnetic ferromagnetic phases. On contrary, films substrates show robust ferromagnetism, with strong spontaneous...
The synthesis, X-ray structure and magnetic properties of polynuclear Cr(III) complexes with the croconate ligand (C5O5(2-)) are reported: [Cr(mu-C5O5)(micro-OH)(OH2)2]2 x 6H2O (, orthorombic, space group Cmca, a = 6.741(7) A, b 18.841(9) c 16.886(9) V 2145(3) A3) shows dinuclear two mu-OH hydroxo molecules that bridging metal centers vicinal C[double bond, length as m-dash]O groups (micro-kappa2O,O coordination mode), octahedral geometry Cr atoms being completed by O atom water molecule...
The shape of the \ensuremath{\gamma} resonance absorption peak ${\mathrm{Eu}}^{3+}$ ion in a disordered structure was investigated some phosphate, borate, and silicate glasses by using $^{151}\mathrm{Eu}$ M\"ossbauer spectroscopy. quality fits tested Durbin-Watson d statistics. observed full width at half maximum resolved contribution broadening quadrupole splitting, due to distortion Eu site compared cubic symmetry. Eu-O bond found have covalent admixture with 6s character. axial component...