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研究了实用型Ｅｒ材料的制备方法和它们的物理性能．用Ｃｏ部分替代Ｎｉ后，该材料的居里温度降至１０Ｋ范围内，在温度低于１０Ｋ的温区内，（ｘ＝０．１，０．２）材料的比热容远大于传统的蓄冷材料金属ｐｂ和其他新型Ｅｒ系磁性蓄冷材料的比热容．磁墒变计算结果表明，材料的Ｅｒ离子有效Ｊ值约为３／２。
The preparation of practical Er materials and their physical properties were studied. When Co is partially replaced by Co, the Curie temperature of the material is reduced to 10K. The specific heat capacity of (x = 0.1, 0.2) material is far greater than that of the conventional cold storage material at a temperature lower than 10K pb and other new Er-type magnetic cold storage material of the specific heat capacity. Magnetic soil moisture change calculation results show that the material of Er ion effective J value of about 3/2.