A5088958723- Advanced Thermoelectric Materials and Devices
- Chalcogenide Semiconductor Thin Films
- Superconductivity in MgB2 and Alloys
- Physics of Superconductivity and Magnetism
- Iron-based superconductors research
- Heusler alloys: electronic and magnetic properties
- Quantum Dots Synthesis And Properties
- Thermal properties of materials
- Thermodynamic and Structural Properties of Metals and Alloys
- Rare-earth and actinide compounds
- Intermetallics and Advanced Alloy Properties
- Thermal Radiation and Cooling Technologies
- Thermal Expansion and Ionic Conductivity
- Corporate Taxation and Avoidance
- Magnetic and transport properties of perovskites and related materials
- Shape Memory Alloy Transformations
- Advanced Thermodynamics and Statistical Mechanics
- Gas Sensing Nanomaterials and Sensors
- Phase-change materials and chalcogenides
- Advanced Battery Technologies Research
- Magnetic Properties of Alloys
- Chemical and Physical Properties of Materials
- Intellectual Capital and Performance Analysis
- Electronic Packaging and Soldering Technologies
- Advanced Condensed Matter Physics
Institute of Condensed Matter Chemistry and Technologies for Energy
2017-2025
National Research Council
2012-2025
Consorzio Roma Ricerche
2025
Sapienza University of Rome
2017
Institute for Energetics and Interphases
2014-2015
National Academies of Sciences, Engineering, and Medicine
2013
Istituto Nazionale di Fisica Nucleare, Sezione di Genova
2005-2009
University of Genoa
2009
Istituto Nazionale di Fisica Nucleare
2004
This article describes the design and characterization of a wearable, shape memory alloy (SMA)‐based soft actuator that provides touch‐like, directional forces to enhance motor training through proprioceptive signals. The actuator's considers functional requirements like weight, actuation speed, stroke length, as well human skin mechanics. It is fabricated by embedding SMA spring in silicone rubber matrix using 3D‐printed moulds. impact on cooling during repeated actuations was assessed...
We measure magnetotransport of F-doped SmFeAsO samples up to 28 T and we extract the upper critical fields, using different criteria. In order circumvent problem criterion-dependent ${H}_{c2}$ values, suggest a thermodynamic estimation field slope $d{H}_{c2}/dT$ based on analysis conductivity fluctuations in regime. A high as large $\ensuremath{-}12\text{ }\text{T}/\text{K}$ is thus extracted for optimally doped sample. find evidence two-dimensional lowest Landau level (LLL) scaling applied...
The order–disorder transition of kesterite (CZTS, Cu2ZnSnS4) from I4̅ to I4̅2m crystal structures has a marked effect on Seebeck coefficient, which displays sharp enhancement at the temperature, around 533 K. Considered be detrimental for performance photovoltaic kesterite, appears beneficial thermopower. Experimental data and ab initio calculations explain origin this enhancement: increase symmetry in disordered polymorph leads favorable electronic band structure characterized by flat...
The present work aims to investigate the effect of Ag doping on thermoelectric properties Cu2SnS3 (CTS). Various Cu2Ag(x)Sn(1–x)S3 (0.05 ≤ x 0.25) samples were synthesized by mechanical alloying followed spark plasma sintering, and their structural transport systematically investigated. = 0.15 sample presented a ∼10-fold higher power factor than undoped CTS. Although, 0.125 had lower sample, owing its thermal conductivity, both showed highest zT ∼ 0.8 at 723 K. This value is comparable best...
We study the effect of neutron irradiation on critical current density ${J}_{c}$ isotopically pure polycrystalline $\mathrm{Mg}\phantom{\rule{0.2em}{0ex}}^{11}\mathrm{B}_{2}$ samples. For fluences in range ${10}^{17}--{10}^{18}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}2}$, is enhanced and its dependence magnetic field significantly improved: we demonstrate that, this regime, pointlike pinning centers are effectively introduced system proportionally to fluence. Instead, for...
Ex situ powder-in-tube MgB2 tapes prepared with ball-milled, undoped powders showed a strong enhancement of the irreversibility field H∗, upper critical Hc2, and current density Jc(H) together suppression anisotropy all these quantities. Jc reached 104 A/cm2 at 4.2 K 10 T, an about 14 T K, Hc2 9 25 high values for not-doped MgB2. The enhanced H∗ are associated significant grain refinement produced by milling powder, which enhances boundary pinning, even if same time also reducing...
Bulk samples of kesterite (Cu2ZnSnS4, CZTS) were produced by cold-pressing and sintering CZTS powders obtained via reactive ball-milling. An increase in the Seebeck coefficient more than 100 μV/K, almost doubling expected value, is noticed around a temperature 260 °C. As pointed out thermal analyses, this due to second order transition from an ordered I-4 disordered I-42m crystal structure. Conversely what happens for solar cell materials, where considered be detrimental performance, it...
Graphene was encapsulated within the crystal lattice of Cu via chemical route to molecularly doped metals affording an excellent electrical conductor dubbed herein “CuproGraf”. Metal bars in CuproGraf embedding less than 0.5 wt% graphene obtained by heating followed hot rolling have conductivity as high 7% made from pure copper. Considering ease preparation, and that substantial room for improvement exists adopting a different powder agglomeration route, method is promising towards...
A structural study of the filled skutterudite Smy(FexNi1-x)4Sb12 was performed by means X-ray powder diffraction and μ-Raman spectroscopy with aim to unveil correlations between electronic properties this material favor improvement its thermoelectric performance. Samples were prepared direct reaction elements at 1223 K, followed quenching subsequent sintering 873 K; microstructure composition obtained products determined SEM-EDS. The position boundary separating regions that obey hole-...
Cu2SnS3 (CTS) is a medium-temperature, ecofriendly, p-type thermoelectric material known for phonon-glass-electron-crystal characteristic. In the present work, ordered and disordered CTS samples were prepared from elemental powders, their electronic vibrational properties systematically investigated by experimental methods ab initio calculations. The polymorph presents higher power factor, PF ∼ 1.5 μW/K2 cm, than stable phase, 0.5 above 700 K, as an effect of smaller band gap carrier...
The parameters governing the thermoelectric efficiency of a material, Seebeck coefficient, electrical, and thermal conductivities, are correlated their reciprocal interdependence typically prevents simultaneous optimization. Here, we present case disordered cubic kesterite ${\mathrm{Cu}}_{2}{\mathrm{ZnSnS}}_{4}$, phase stabilized by structural disorder at low temperature. With respect to ordered form, introduction improves three same time. origin this peculiar behavior lies in localization...
In extreme temperature environments, a newly emerging engineering application involves both the active and passive control of structures using cryogenic shape memory alloys, which are smart materials able to recover high deformation below freezing point. With objective carrying out new advances in this area, present work aims investigate Cu-7.5Al-13.5Mn (wt.%) alloy. Thermal, microstructural, thermomechanical analyses as-cast hot-rolled specimens were performed, taking into account effects...
MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> tapes have been synthesized through the ex-situ powder-in-tube (PIT) method. This technique involves cold working of tubes various metals-in this case Ni-previously filled by suitably reacted powders, followed proper heat treatments. In particular, it allows use different starting powders and control over their properties. We studied influence on superconducting properties final...
We report measurements of resistivity, magnetoresistivity, Hall effect, Seebeck coefficient and infrared reflectivity undoped SmFeAsO lightly doped SmFeAs(O0.93F0.07) oxypnictides. All the properties measured on are characterized by clear signatures magnetic instability. A self-consistent picture emerges in which carrier condensation occurs below transition, due to opening a spin density wave (SDW) gap. This is accompanied mobility increase not-gapped carriers suppression electron–electron...
The enhanced Jc and Birr of in situ MgB2
The grain size and the boundaries play an important role in determining pinning properties current carrying capability of MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> . Here we present experimental study on effect oxidation superconducting <i xmlns:xlink="http://www.w3.org/1999/xlink">ex-situ</i> Powder-in-Tube (PIT) tapes. We fabricated Fe-sheathed monofilamentary tapes using a variety powders synthesized inert (IA) or oxidizing...
MgB2 monofilamentary nickel-sheated tapes and wires were fabricated by means of the ex-situ powder-in-tube method using either high-energy ball milled low temperature synthesized powders. All sample sintered at 920 C in Ar flow. The milling time revolution speed tuned order to maximize critical current density field (Jc): maximum Jc value 6 x 10e4 A/cm2 5 K 4 T was obtained corresponding tape prepared with powders for 144h 180rpm. Vorious synthesis also investigated (730-900 C) finding a...
We present a study concerning the partial substitution of yttrium at lanthanum site undoped LaFeAsO and superconducting ${\text{LaFeAsO}}_{0.85}{\text{F}}_{0.15}$ compounds. prepared samples with nominal content up to 70% producing simultaneous shrinkage both $a$- $c$-lattice parameters by 1.8% 1.7%, respectively. The chemical pressure provided this smaller ion size causes lowering spin density wave temperature in compounds, as well an increase transition temperatures doped ones. 15%...