在微波器件和精密仪器中,要求所用的永磁材料在很宽的温度范围内磁通基本保持不变,亦即要求所用的永磁材料具有很低的可逆温度系数(α)。铝镍钴、铁氧体、铂钴和普通的稀土钴永磁材料均不能满足上述要求。我们根据轻稀土钴和重稀土钴化合物的磁化强度随温度变化的相反性质,即轻稀土钴化合物的磁化强度随温度增加而降低,而重稀土钴化合物的磁化强度在一定温度范围内随温度增加而增加。通过用重稀土Gd、Er取代SmCo_5中一部分Sm,并适当调节Sm与Gd、Er之间的比例,制备成了可逆温度系 In microwave devices and precision instruments, the permanent magnet material used is required to maintain essentially the same flux over a wide temperature range, ie, the permanent magnet material used requires a very low reversible temperature coefficient (α). Alnico, ferrite, platinum cobalt and ordinary rare earth cobalt permanent magnetic materials can not meet the above requirements. Based on the opposite of the change of magnetization of the light rare earth cobalt and heavy rare earth cobalt compounds with temperature, that is, the magnetization of the light rare earth cobalt compound decreases with increasing temperature, and the magnetization of the heavy rare earth cobalt compound increases with temperature within a certain temperature range Increase. Replacing a portion of Sm in SmCo_5 with heavy rare earths Gd and Er and adjusting the ratio between Sm and Gd and Er appropriately, a reversible temperature system