采用两种不同方法制备了钆球与钆颗粒,并对两种材料的磁性能进行了研究.结果表明,由于机加工带来的应力应变及不规则尺寸,导致钆颗粒的磁性能不同于钆球.首先,机加工制备的颗粒,尽管其氧含量比加工前高出一倍,而离心雾化法制得的钆球氧含量基本不变,钆颗粒与钆球的最大磁熵变相差不大;其次,钆颗粒与钆球的居里温度存在偏差,分别为293K和296K;再者,在相同磁场下,居里温度以上温区,钆颗粒的磁熵变趋于平缓,且大于钆球的磁熵变,这种趋势在高磁场下更为明显.
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