New Ternary Magnetic Lanthanide Regenerator Materials for the Low-Temperature Stage of a Gifford-McMahon (G-M) Cryocooler
Four new alloys Er6Ni2Sn, Er6Ni2Pb, Er6Ni2(Sn0.75Ga0.25), and 50:50 Er6Ni2Sn/Er3Ni have been prepared and studied as potential candidate materials for the lower temperature stage of Gifford-McMahon (G-M) cryocooler. The important criteria for developing magnetic cryocooler alloys are described and these were utilized to discover the four materials. The low temperature heat capacities of the four alloys in the as cast and heat treated conditions were measured from 1.5 to 40K, along with those of Pr3Ni, Nd3Ni and Er3Ni. The field dependence of the heat capacity of Er6Ni2Sn, and the magnetic susceptibility of Er6Ni2Pb and Er6Ni2(Sn0.75Ga0.25) indicate that the Er6Ni2X phases order ferrimagnetically. The heat capacities of Er6Ni2X alloys are significantly higher than that of Pb below 18K, and that of Er3Ni between 9 and 18K. These results indicate that they would be good cryogenic regenerator materials for a G-M cryocooler which operates down to ~10K, and would provide greater cooling power than Pb for the same size cryocooler.
KeywordsHeat Capacity Regenerator Material Lanthanide Series High Heat Capacity Paramagnetic Curie Temperature
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