CANEPA , Fabio Michele

Recent physical results related to some binary and ternary rare earth intermetallic compounds are presented. The investigation has been addressed to different objectives: the study of the magnetothermodynamic properties of some binary and ternary Gd compounds is devoted to a possible technological use in the magnetic refrigeration and as a...

The electrical resistivity of the intermetallic compounds LaAg, CeAg and YAg has been measured in the range 10-800 K. The data on YAg are described by the usual Block-Gruneisen formula, but both CeAg and LaAg show higher resistivity values and a different thermal dependence. These anomalies can be ascribed to valence instabilities of the two...

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A detailed study of the pseudobinary phase (U1−xThx)14Au51 is reported. The stability of the complete solid solution with the hexagonal P6/m, Gd14Ag51 structural type was observed in the whole composition range. Magnetic susceptibility (1.5–300 K) and electrical resistivity (10–800 K) measurements are reported for a wide number of intermediate...

Magnetic and thermodynamic measurements, performed on the Dy3Co8Sn4 intermetallic phase, give evidence of a transition to the ferrimagnetic state below 73 K. From the hysteresis cycle at 5 K the remanence (B-r = 0.36 T) and the coercive field (H-c = 0.25 T) were obtained. Frequency dependence of the AC susceptibility and temperature dependence...

The crystallographic parameters and electrical resistivity measurements in the 1.5–300 K temperature range for the LaXSn phases (X ≡ Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au) are reported. A change in structure with increasing group number of the transition metal is observed. A new superconducting compound, LaRhSn with Tc = 1.7 K, is detected by...

The magnetic contribution of the solvent on the RT ac magnetic susceptibility behaviour of Fe3O4 magnetic nanoparticles in solution at different concentrations, is presented and discussed. The room temperature complex susceptibility of the solvent water was studied as a function of several parameters, namely different ac fields, superimposed dc...

U14Au51 and UAu2 were recently demonstrated the two correct phases stable at room temperature in the U-Au system. Magnetic susceptibility (1.5–300 K) and electrical resistivity (10–800 K) measurements were performed in samples of both phases. Magnetic susceptibility temperature behaviour gives evidences of an antiferromagnetic transition at 23...

A new family of the noble metal-actinide intermetallics was investigated. The electrical resistivity and magnetic susceptibility measurements on some pseudobinary phases in the U14Au51Th14Au51 system are reported. The effects of the observed competition between strong antiferromagnetic coupling and itinerant. Kondo-like 5f states are discussed.

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As a part of a current research concerning the physical characterisation of Rare Earth intermetallic compounds for magnetic refrigeration devices, the magnetocaloric properties of the Gd7Pd3 phase, which shows a ferromagnetic transition at 318 K, are presented. Heat capacity measurements have been performed in the 5-360 K temperature range and...

We report on the magnetic properties of the compounds Gd5T3 (T=Si,Ge,Sn), as obtained from DC magnetisation measurements in applied fields up to 90 kOe and in a temperature range between 3 and 300 K. The low temperature magnetisation data of the three phases indicate antiferromagnetic ordering, in the paramagnetic state, all the compounds...

The new phase View the MathML source) was examined via the temperature dependences of the lattice parameters (10–300 K), magnetic susceptibility (1.5–300 K) and electrical resistivity (0.3–300 K). Different Ce valences (+4 and +3) for different crystallographic sites are proposed from magnetic data and are supported by previous structural...

In the last years, the study of Fe-based magnetic nanoparticles (MNP) has attracted increasing interest either for the physical properties shown by nanosized materials (electric and magnetic properties are strongly affected by dimension and surface effects) either for the different technological applications of these materials (catalysis, drug...

Abstract Active Magnetic Regeneration (AMR) is a configuration that allows magnetic refrigeration to be suitable also for room temperature applications. This work is intended to detect, by means of a 1-D numerical model, the influence on the regenerator performances of the working condition ambient temperature (TCURIE ± 20 K) and of the...

In the present chapter a concise review concerning the AC susceptibility technique applied to bulk magnetic compounds, and thin films is presented. The measurement of the dynamical properties of magnetic compounds has become extremely important in the understanding of complex magnetic phenomena such as ...

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We have measured on the CeSn3 compound, the expansion coefficient between 80 and 800 K at normal pressure, the isothermal compressibility in the 0–8 GPa pressure range at room temperature and the heat capacity at constant pressure in the 60–300 K temperature range. The experimental data were compared with those previously found for the...

Thermal expansion coefficient between 77 and 900 K, isothermal compressibility in the 0–8 GPa pressure range, magnetic susceptibility between 1.3 and 800 K and the heat capacity at constant pressure in the 20–300 K temperature range were determined for the LaPb3 and CePb3 compounds. Both the thermal expansion (3α) and the isothermal...

Magnetite (Fe3O4 ) and silica-coated magnetite (Fe3O4@SiO2) nanoparticles (NPs) were synthesized and characterized by scanning and transmission electron microscopy and by a.c. susceptibility measurements as a function of the frequency both at room temperature and 80 K. A new mathematical approach based on the explicit coexistence (at room...

Thermal expansion coefficient between 77 and 900K, isothermal compressibility in the 0-80 kbars pressure range, magnetic susceptibility between 77 and 1300 K and heart capacity at constant pressure in the 20-300 K temperature range were determined for the LaSn3 compound. From the experimental data, the specific heat at constant volume was...