NAPOLETANO M.

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 paper reports on the crystal structure determination and magnetic measurements of the Gd2CoAl, Gd2Co2Ga and Gd14Co3In2.7 phases. Gd2Co2Ga and the new intermetallic compound Gd2Co2Al crystallise in the Pr2Ni2Al structure, while single crystal data show that Gd14Co3In2.7 is closely related to the Lu14Co2In3 phase, but with a different...

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...

AC and DC magnetic measurements were performed on the ternary intermetallic phase Tb3Co8Sn4. The compound shows a ferrimagnetic transition at T-c=91 K. From the imaginary part of the AC susceptibility a second broad peak was detected at T-s=28 R and ascribed to a transition to a spin glass state. Zero field cooled (ZFC) and field cooled (FC)...

The magnetic properties of the R3CoxSn4 phases (R = Pr, Nd, Sm) were studied by AC and DC magnetic techniques. The three compounds order magnetically at 17, 37 and 83 K, respectively. Pr3Co8Sn4 and Nd3Co8Sn4 exhibit a spin reorientation transition under an applied field of 4 T (Pr) and 2 T (Nd), detected also by DC thermomagnetic measurements....

The heat capacities of three Ca compounds, namely CaSi2, Ca3Si4 and Ca14Si19 were measured in the 3-300 K temperature range by adiabatic calorimetry. No thermal anomalies were found in the whole temperature range. La the three Ca Silicides. from an analysis of the low temperature data (T<40 K), a power law lower than three in the lattice heat...

A complete physical characterisation, through specific heat, electrical resistivity and magnetization measurements was performed, in a wide temperature range on the new phase Ce2CoSn7, which crystallizes in a very large fee cell with a structure type similar to the Tb117Fe52Ge112 one. From the real part of the AC susceptibility data a broad...

The magnetisation and the magnetoresistance of the LuMn6Ge6-xGax compounds (x=0.2, 0.4, 0.6) at 10 and 295 K in applied magnetic fields up to 9 T is presented. The partial substitution of Ga for Ge leads to a large and significant increase of the c/a ratio with different changes in Mn-Mn distances. Rather large negative values of...

Polycrystalline samples of HfFe6Ge6-type LuMn6Sn6-xInx compounds (0.08less than or equal toxless than or equal to0.48) have been studied by magnetisation, a.c. susceptibility and magnetoresistance measurements. The compounds order antiferromagnetically between T-N=391 K for x=0.08 to T-N=313 K for x=0.48. Field dependence of the magnetisation...

Electrical, magnetic and thermodynamic measurements have been performed on the rhombic Gd6Co2.2In0.8 intermetallic phase. The experimental data reveal that two magnetic transitions take place. In the first, at 34 K, the magnetic configuration of the sample changes from an antiferromagnetic type to a ferromagnetic type where, however, anti ferro...

The low-temperature heat capacities of the two ternary intermetallic compounds GdNiGa and GdNiIn, which order ferromagnetically at 30.5 and 93.5 K respectively, were measured as a function of the magnetic field up to 9 tesla. From the experimental data the isothermal magnetic entropy change (Delta S-magn) and the adiabatic temperature raise...