Nd元素掺杂与替代对Mn1.2Fe0.8P0.74Ge0.26化合物的磁热性能的影响
首发时间:2016-05-19
摘要:MnFePGe系列化合物具是备受人们关注的室温磁制冷材料,其具有优异的磁热性能。熵变、滞后、相变温度以及转变温区是衡量磁热性能优异的四个参数,熵变大、滞后小,相变接近室温、转变温区窄是我们追求的目标。本文用稀土元素Nd对Mn1.2Fe0.8P0.74Ge0.26化合物进行了掺杂和替代,研究了元素的微量掺杂和替代对该化合物磁热性能的影响。结果表明,Nd元素的掺杂和替代可以略微提高该化合物的滞后、略微地降低熵变,但可以提高相变温度、显著地缩短转变温区。通过适当地延长烧结时间可以缓解这些不足之处。综合考虑,Nd元素的掺杂比替代可以更多地缩短转变温区提高转变速率,所以用微量的Nd元素掺杂可以提高磁热性能。
关键词: MnFePGe, 磁热性能 Nd元素, 掺杂 替代
For information in English, please click here
Influence of Nd dopant and substitution on Magnetocaloric Effect of Mn1.2Fe0.8P0.74Ge0.26 Compounds
Abstract: MnFePGe compounds, as room-temperature magnetic refrigerant materials, have attracted much attention due to their excellent magnetocaloric performance. Entropy change, hysteresis, phase transition temperature, and coexisting temperature are four parameters to judge the magnetocaloric performance. Large entropy change, small hysteresis, phase transition temperature nearby the room temperature, and narrow coexisting temperature are the goal of the investigation. In this paper, Mn1.2Fe0.8P0.74Ge0.26 compounds are prepared by Nd element dopant and substitution and the influence of Nd element on magnetocaloric effect was investigated. It showed that the Nd element can slightly increase the hysteresis and lower the entropy change, and can also elevate the phase transition temperature and remarkably narrow the coexisting temperature. By elongating the holding time can relieve these drawbacks. In total, The Nd element dopant can increase the phase transition rate by narrowing the coexisting temperature. Thus the comprehensive magnetocaloric performance can be improved by infinitesimal Nd dopant.
Keywords: MnFePGe, magnetocaloric effect, Nd elementdo, dopant, substitution
论文图表:
引用
No.4689900114822314****
同行评议
共计0人参与
勘误表
Nd元素掺杂与替代对Mn1.2Fe0.8P0.74Ge0.26化合物的磁热性能的影响
评论
全部评论0/1000