Crystal structure, magnetic properties, and the magnetocaloric effect of Gd5Rh4 and GdRh

Date
2013-01-01
Authors
Wang, C.L.
Zhou, J.D.
Li, Jun
Mudryk, Yaroslav
Miller, Gordon
Gschneidner, Karl
Long, Y.
Smetana, Volodymyr
Miller, Gordon
Pecharsky, Vitalij
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Ames Laboratory
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Chemistry
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Ames LaboratoryMaterials Science and EngineeringChemistry
Abstract

The crystal structures of Gd5Rh4 and GdRh have been studied by powder and single crystal x-ray diffraction. The results show that Gd5Rh4 is isotypic with Pu5Rh4 and the bond length of the short Rh-Rh dimer is 2.943(4) Å. According to heat capacity measurements in zero magnetic field, the magnetic ordering temperature of Gd5Rh4 is 13 K, in agreement with magnetization measurements. Both the heat capacity peak shape and the positive slope of the Arrott plots at Curie temperature (TC) indicate the second-order nature of the magnetic transition. The temperature dependence of magnetization of Gd5Rh4 measured in 1 kOe applied field indicates noncollinear magnetic ordering that may change into nearly collinear ferromagnetic ordering by increasing the magnetic field. GdRh is ferromagnetic below T C  = 22 K. Moderate magnetocaloric effects and relatively high refrigerant capacities are observed in Gd5Rh4 and GdRh.

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The following article appeared in Journal of Applied Physics 113, 17A904 (2013); 1 and may be found at doi:10.1063/1.4793775.

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