【摘 要】
：
本研究采用机械合金化和放电等离子烧结技术制备了Mn1.2Fe0.8P1-xGexAly(x=0.24,0.25,0.26;y=0,0.004,0.008,0.01,0.012)合金,研究了Al掺杂量对其晶体结构、相变过程、磁热效
【机 构】
：
北京工业大学固体微结构与性能研究所,100124北京工业大学材料学院,100124
【出 处】
：
第三届全国磁热效应材料和磁制冷技术学术研讨会
论文部分内容阅读
本研究采用机械合金化和放电等离子烧结技术制备了Mn1.2Fe0.8P1-xGexAly(x=0.24,0.25,0.26;y=0,0.004,0.008,0.01,0.012)合金,研究了Al掺杂量对其晶体结构、相变过程、磁热效应等的影响.研究结果表明,在Al掺杂量为0.01(原子比)时可以使居里温度(Tc)提高6-15℃,降低滞后9.3-27.6％,而对材料的熵变(约22J/Kg?K)和绝热温变(2.6K左右)无不利影响.通过XRD数据进行晶胞参数精修及相含量的拟合,发现随着Al元素掺杂量的增大,晶胞参数a增大、c减小、c/a减小,晶胞体积V增大.c/a的变化与晶胞体积V和Tc呈反比关系,随着c/a的减小,合金的晶胞体积V增大而Tc增高.
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