Around the composition Gd4Co3: Structural, magnetic and magnetocaloric properties of Gd6Co4.85(2)

作者：Tence S; Gaudin E^*; Chevalier B

来源：Intermetallics, 2010, 18(6): 1216-1221.

DOI：10.1016/j.intermet.2010.03.016

• Rare-earth intermetallics
• Magnetic properties
• Phase identification
• Site occupancy
• Energy systems

Investigation of the Gd-Co system around the composition Gd4Co3 showed that this compound does not exist. When samples with the nominal composition Gd4Co3 are synthesized a mixture of Gd12Co7 and Gd6Co4.85(2) (=Gd4Co3.23(2)) is observed. Gd6Co4.85(2) is the only compound found around the composition Gd:Co = 4:3. Its structure was determined by means of X-ray diffraction on single crystal with the space group P6(3)/m. The cell parameters are a = 11.593(2) angstrom and c = 4.0495(14) angstrom. Its structure is closely related to the Ho4Co3.07-type or to the Ce6Ni1.67Si3-type structure. Gd6Co4.85(2) exhibits only one ferro(ferri) magnetic transition at 219(1) K and the second magnetic transition at 163 K, wrongly attributed to a spin reorientation, corresponds indeed to the ferromagnetic transition of the impurity Gd12Co7. Gd6Co4.85(2) presents magnetocaloric properties with a maximal adiabatic temperature change Delta T-ad equal to 4.4 K for mu(0)Delta H = 4.5 T.

• 出版日期2010-6
• 单位中国地震局