In this work, we present magnetization, specific heat and magnetic entropy studies on polycrystalline samples of the pyrochlore  family, at different magnetic fields. In the temperature dependence  of magnetization, the magnetic temperature transition is  2.62K and 2.95K for magnetic fields around 3, 4 and 5T, respectively, which is corresponding to an antiferromagnetic ordering temperature.

Heat capacity measurements have been performed in the temperature range of 1.8-10K without the presence of a magnetic field and with  a magnetic field of 1 up to 5T. The magnetic entropy in an applied magnetic field of 0 to 5T is found to reach 19.92(J/K.mol(Er)), which is about 86% of the value expected from specific heat measurements. The magnetocaloric effect has been estimated in terms of heat capacity in magnetic fields up to 5T. The effect of increasing the magnetic field in on the magnetic and magnetocaloric properties will be discussed.

pyrochlore, specific heat, magnetic entropy, magnetocaloric.