CIRAFICI , Salvino

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)...

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A thermodynamic performance analysis is developed for a Steyert-like rotary magnetic refrigeration (RMR) system operating in the near-room temperature range with two possible, alternative, gadolinium compounds. The first magnetocaloric material (MCM) is an alloy (Gd7Pd3) with a well defined Curie temperature (around 318 K), while the second MCM...

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Structural, electric and magnetic measurements have been performed on the new rare earth intermetallic compound Gd2Ni2Cd. It crystallises in the Mn2B2Al-type structure (space group Cmmm) and undergoes an antiferromagnetic transition at 65 K. Above 70 K the compound follows the Curie-Weiss law with μ = 8.03 μB and θ = + 22 K. The transition is...

The low temperature heat capacity and magnetization were measured for the Pr,Co,Al, intermetallic compound. A ferromagnetic transition was observed at 4.5 K with a saturation value of the magnetic moment of the Pr atom in the ordered state of 1.1 mu(B) at 2.5 K. In the paramagnetic region the compound follows the Curie-Weiss law with mu(eff) =...

Abstract The ageing effects due to the interaction with typical working fluids (water and air) of magnetic refrigerant materials have been analysed for up to one year. Among the many compounds reported to exhibit a sufficiently high magnetocaloric effect, we decided to artificially age Gd, which represents the first choice high magnetocaloric...

The R3Co8Sn4 compounds (R = rare earth) have been synthesized and studied by single crystal and powder X-ray diffractometry. The phases with R = Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y crystallize in the Lu3Co7.77Sn4 structure type, but with full occupancy of all atomic positions, giving 3:8:4 stoichiometry in all cases except the...

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