论文部分内容阅读
The magnetocaloric effect of Mn,Ni,and Mn-Ni-doped EuTiO3 compounds are studied in the near-liquid-helium-temperature range.The Eu(Ti0.9375Mn0.0625)O3,Eu(Ti0.975Ni0.025)O3,and Eu(Ti0.9125Mn0.0625Ni0.025)O3 are prepared by the sol-gel method.The Eu(Ti0.9375Mn0.0625)O3 and Eu(Ti0.9125Mn0.0625Ni0.025)O3 exhibit ferromagnetism with second-order phase transition,and the Eu(Ti0.975Ni0.025)O3 displays antiferromagnetic behavior.Under the magnetic field change of 10 kOe(1 Oe = 79.5775 A·m-1),the values of magnetic entropy change are 8.8 J·kg-1·K-1,12 J·kg-1·K-1,and 10.9 J·kg-1·K-1 for Eu(Ti0.9375Mn0.0625)O3,Eu(Ti0.975Ni0.025)O3,and Eu(Ti0.9125Mn0.0625Ni0.025)O3,respectively.The co-substitution of Mn and Ni can not only improve the magnetic entropy change,but also widen the refrigeration tempera-ture window,which greatly enhances the magnetic refrigeration capacity.Under the magnetic field change of 10 kOe,the refrigerant capacity value of Eu(Ti0.9125Mn0.0625Ni0.025)03 is 62.6 J·kg-1 more than twice that of EuTi03(27 J·kg-1),indicating that multi-component substitution can lead to better magnetocaloric performance.