Search results for: G. Barucca

Items from 1 to 20 out of 46 results

article

Precision resonance energy scans with the PANDA experiment at FAIR

The PANDA Collaboration, G. Barucca, F. Davı, G. Lancioni, more

The European Physical Journal A > 2019 > 55 > 3 > 1-18

. This paper summarises a comprehensive Monte Carlo simulation study for precision resonance energy scan measurements. Apart from the proof of principle for natural width and line shape measurements of very narrow resonances with PANDA, the achievable sensitivities are quantified for the concrete example of the charmonium-like X(3872) state discussed to be exotic, and for a larger parameter space...

article

Zn nanoparticle formation in FIB irradiated single crystal ZnO

M. Pea, G. Barucca, A. Notargiacomo, L. Di Gaspare, more

Applied Surface Science > 2018 > 433 > C > 899-903

We report on the formation of Zn nanoparticles induced by Ga⁺ focused ion beam on single crystal ZnO. The irradiated materials have been studied as a function of the ion dose by means of atomic force microscopy, scanning electron microscopy, Raman spectroscopy and transmission electron microscopy, evidencing the presence of Zn nanoparticles with size of the order of 5–30nm. The nanoparticles are found...

article

Effects of build orientation and element partitioning on microstructure and mechanical properties of biomedical Ti-6Al-4V alloy produced by laser sintering

P. Mengucci, A. Gatto, E. Bassoli, L. Denti, more

Journal of the Mechanical Behavior of Biomedical Materials > 2017 > 71 > C > 1-9

Direct Metal Laser Sintering (DMLS) technology was used to produce tensile and flexural samples based on the Ti-6Al-4V biomedical composition. Tensile samples were produced in three different orientations in order to investigate the effect of building direction on the mechanical behavior. On the other hand, flexural samples were submitted to thermal treatments to simulate the firing cycle commonly...

article

Magnetic anisotropy phase-graded A1/L10-FePt films on amorphous glass substrates

G. Barucca, Th. Speliotis, G. Giannopoulos, D. Niarchos, more

Materials & Design > 2017 > 123 > C > 147-153

Magnetic anisotropy phase-graded A1/L1₀-FePt films deposited on amorphous glass substrates were investigated combining ultra-high resolution electron microscopy and angular-dependent magnetic measurements. A highly textured (001) L1₀ FePt film was first deposited at the relative low temperature of 625K using an MgO/Cr underlayer stack, hence a second layer was grown while continuously decreasing the...

article

Focused ion beam surface treatments of single crystal zinc oxide for device fabrication

M. Pea, V. Mussi, G. Barucca, E. Giovine, more

Materials & Design > 2016 > 112 > C > 530-538

We investigated 30kVGa⁺ ions treatments on (0001) single crystal ZnO in order to assess the potentiality of ion beam based device fabrication on such material. A multi-technique approach combining atomic force microscopy, Raman and energy dispersive X-Ray spectroscopies, and transmission electron microscopy was used to study morphological and structural properties of ZnO upon varying the ion dose...

article

Effects of thermal treatments on microstructure and mechanical properties of a Co–Cr–Mo–W biomedical alloy produced by laser sintering

P. Mengucci, G. Barucca, A. Gatto, E. Bassoli, more

Journal of the Mechanical Behavior of Biomedical Materials > 2016 > 60 > C > 106-117

Direct Metal Laser Sintering (DMLS) technology based on a layer by layer production process was used to produce a Co–Cr–Mo–W alloy specifically developed for biomedical applications. The alloy mechanical response and microstructure were investigated in the as-sintered state and after post-production thermal treatments. Roughness and hardness measurements, and tensile and flexural tests were performed...

article

Exchange bias properties of 140nm-sized dipolarly interacting circular dots with ultrafine IrMn and NiFe layers

F. Spizzo, M. Tamisari, F. Chinni, E. Bonfiglioli, more

Journal of Magnetism and Magnetic Materials > 2016 > 400 > C > 242-247

We studied the exchange bias effect in an array of IrMn(3nm)/NiFe(3nm) circular dots (size ~140nm and center-to-center distance ~200nm, as revealed by microscopy analyses), prepared on a large area (3×3mm²) by electron beam lithography and lift-off, using dc sputtering deposition. Hysteresis loops were measured by SQUID magnetometer at increasing values of temperature T (in the 5–300K range) after...

article

Biomedical Co-Cr-Mo Components Produced by Direct Metal Laser Sintering1

E. Girardin, G. Barucca, P. Mengucci, F. Fiori, more

Materials Today: Proceedings > 2016 > 3 > 3 > 889-897

Direct Metal Laser Sintering (DMLS) is an additive manufacturing technique based on a laser power source that sinters powdered materials using a 3D CAD model. The mechanical components produced by this procedure typically show higher residual porosity and poorer mechanical properties than those obtained by traditional manufacturing techniques. In this study, samples were produced by DMLS starting...

chapter

Structural and electrical characterizations of polymer-supported graphene fabricated by graphite nanoplatelets

U. Coscia, M. Palomba, G. Ambrosone, G. Barucca, more

18th Italian National Conference on Photonic Technologies (Fotonica 2016) > 1 - 4

18th Italian National Conference on Photonic Technologies (Fotonica 2016)

An effective micromechanical technique to prepare graphene multilayers on low density polyethylene (LDPE) substrates was carried out. This fabrication method, based on the spreading of graphite nanoplatelets (GNP) onto a LDPE film surface by using shear stress and friction force, allows to obtain large area specimens. The morphological and structural properties of the GNP precursor and graphene multilayers...

article

Hydrogen storage properties of Pd-doped thermally oxidized single wall carbon nanohorns

D. Giasafaki, G. Charalambopoulou, Ch. Tampaxis, D. Mirabile Gattia, more

Journal of Alloys and Compounds > 2015 > 645 > S1 > S485-S489

Single wall carbon nanohorns as well as their thermally oxidized derivatives were decorated with Pd nanoparticles and their H₂ sorption performance was examined at 298K up to 20bar. The specific surface area of the nanohorns was increased through air oxidation, while both the thermal treatment and the metal doping led to the enhancement of the H₂ uptake. The higher uptake of the hybrid materials could...

article

Structural, mechanical and light yield characterisation of heat treated LYSO:Ce single crystals for medical imaging applications

P. Mengucci, G. André, E. Auffray, G. Barucca, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2015 > 785 > C > 110-116

Five single crystals of cerium-doped lutetium yttrium oxyorthosilicate (LYSO:Ce) grown by the Czochralski method were submitted to structural characterisation by X-ray (XRD) and neutron (ND) diffraction, scanning (SEM) and transmission (TEM) electron microscopy and energy dispersive microanalysis (EDS). The Ultimate Tensile Strength (UTS), the Young Modulus (YM) and the Light Yield (LY) of the samples...

article

Structural characterization of biomedical Co–Cr–Mo components produced by direct metal laser sintering

G. Barucca, E. Santecchia, G. Majni, E. Girardin, more

Materials Science and Engineering: C > 2015 > 48 > C > 263-269

Direct metal laser sintering (DMLS) is a technique to manufacture complex functional mechanical parts from a computer-aided design (CAD) model. Usually, the mechanical components produced by this procedure show higher residual porosity and poorer mechanical properties than those obtained by conventional manufacturing techniques.In this work, a Co–Cr–Mo alloy produced by DMLS with a composition suitable...

article

Magnesium growth in magnesium deuteride thin films during deuterium desorption

R. Checchetto, A. Miotello, P. Mengucci, G. Barucca

Journal of Alloys and Compounds > 2013 > 580 > Supplement 1 > S29-S32

Pd- capped nanocrystalline magnesium thin films having columnar structure were deposited on Si substrate by e-gun deposition and submitted to thermal annealing in D ₂ atmosphere to promote the metal to deuteride phase transformation. The kinetics of the reverse deuteride to metal transformation was studied by Thermal Desorption Spectroscopy (TDS) while the structure of the as deposited and...

article

Study of microstructure and magnetization reversal mechanism in granular CoCrPt:SiO2 films of variable thickness

G. Varvaro, A.M. Testa, E. Agostinelli, D. Fiorani, more

Materials Chemistry and Physics > 2013 > 141 > 2-3 > 790-796

The effect of the thickness and microstructural features on the switching behaviour of granular CoCrPt:SiO ₂ films with perpendicular magnetic anisotropy was investigated. TEM plane view and cross section analysis indicate that, while the very first layers grow as uniform nanograins in close contact, the growth proceeds by formation of well-defined CoCrPt columnar islands (7 nm average size)...

article

Structure modification of Mg–Nb films under hydrogen sorption cycles

P. Mengucci, G. Barucca, G. Majni, N. Bazzanella, more

Journal of Alloys and Compounds > 2011 > 509 > Supplement 2 > S572-S575

In the present work we focus our attention on the structural modifications induced by repeated absorption/desorption cycles on Mg–Nb layers. Samples consisting of a 30μm thick pure Mg or Mg–5at.% Nb doped films, coated with a 20nm thick Pd layer were submitted to repeated H ₂ sorption cycles in a volumetric apparatus.Isothermal desorption analysis at 350°C was performed to evaluate the amount...

article

Formation and evolution of the hardening precipitates in a Mg–Y–Nd alloy

G. Barucca, R. Ferragut, F. Fiori, D. Lussana, more

Acta Materialia > 2011 > 59 > 10 > 4151-4158

The formation and evolution of hardening precipitates in a Mg–Y–Nd (WE43) alloy during artificial ageing at 150 and 210°C is followed by small angle X-ray scattering (SAXS) measurements, Vickers microhardness tests and transmission electron microscopy (TEM) observations. A quantitative description of the alloy studied during the early and advanced stages of the precipitation sequence is presented...

article

Phase transformations in QE22 Mg alloy

G. Barucca, R. Ferragut, D. Lussana, P. Mengucci, more

Acta Materialia > 2009 > 57 > 15 > 4416-4425

The precipitation sequence in a QE22 Mg alloy is followed by differential scanning calorimetry, microhardness, electrical resistivity, positron annihilation spectroscopy and transmission electron microscopy (TEM) observations, after different thermal treatments. The decomposition of the supersaturated solid solution occurs via the formation of nanosized coherent structures (GP zones) followed by the...

article

A novel thermal treatment on a Mg–4.2Y–2.3Nd–0.6Zr (WE43) alloy

G. Riontino, M. Massazza, D. Lussana, P. Mengucci, more

Materials Science & Engineering A > 2008 > 494 > 1-2 > 445-448

A double-stage thermal treatment has been adopted on a Mg–Y–Nd–Zr (WE43) alloy, following suggestions of a previous calorimetric investigation. A secondary precipitation is claimed to occur at a temperature as low as 150°C after a preliminary precipitation at 210°C, with the effect of enhancing the hardness increase and reducing the annealing times.

article

Structure evolution of EV31 Mg alloy

G. Riontino, D. Lussana, M. Massazza, G. Barucca, more

Journal of Alloys and Compounds > 2008 > 463 > 1-2 > 200-206

Structure modifications and precipitation hardening of EV31 Mg alloy have been monitored by calorimetric measurements (DSC), TEM observations and positron annihilation spectroscopy (PAS). At the early stages of precipitation DSC measurements and TEM observations evidenced the formation of a β″ phase, while the presence of an intermediate β′ is supported by positron data. Overageing is correlated to...

article

Structure evolution of a WE43 Mg alloy submitted to different thermal treatments

P. Mengucci, G. Barucca, G. Riontino, D. Lussana, more

Materials Science & Engineering A > 2008 > 479 > 1-2 > 37-44

The structure evolution of the WE43 Mg alloy during different thermal treatments is studied by differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and positron annihilation spectroscopy (PAS). Isothermal annealings at different temperatures are made, with the aim to correlate the alloy's structure with its hardness response and to compare these treatments to the standard...

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Search results for: G. Barucca

Precision resonance energy scans with the PANDA experiment at FAIR

Zn nanoparticle formation in FIB irradiated single crystal ZnO

Effects of build orientation and element partitioning on microstructure and mechanical properties of biomedical Ti-6Al-4V alloy produced by laser sintering

Magnetic anisotropy phase-graded A1/L10-FePt films on amorphous glass substrates

Focused ion beam surface treatments of single crystal zinc oxide for device fabrication

Effects of thermal treatments on microstructure and mechanical properties of a Co–Cr–Mo–W biomedical alloy produced by laser sintering

Exchange bias properties of 140nm-sized dipolarly interacting circular dots with ultrafine IrMn and NiFe layers

Biomedical Co-Cr-Mo Components Produced by Direct Metal Laser Sintering1

Structural and electrical characterizations of polymer-supported graphene fabricated by graphite nanoplatelets

Hydrogen storage properties of Pd-doped thermally oxidized single wall carbon nanohorns

Structural, mechanical and light yield characterisation of heat treated LYSO:Ce single crystals for medical imaging applications

Structural characterization of biomedical Co–Cr–Mo components produced by direct metal laser sintering

Magnesium growth in magnesium deuteride thin films during deuterium desorption

Study of microstructure and magnetization reversal mechanism in granular CoCrPt:SiO2 films of variable thickness

Structure modification of Mg–Nb films under hydrogen sorption cycles

Formation and evolution of the hardening precipitates in a Mg–Y–Nd alloy

Phase transformations in QE22 Mg alloy

A novel thermal treatment on a Mg–4.2Y–2.3Nd–0.6Zr (WE43) alloy

Structure evolution of EV31 Mg alloy

Structure evolution of a WE43 Mg alloy submitted to different thermal treatments

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