摘要
通过电弧炉熔炼法制备了LaFe11.4Si1.6-x P x（x=0.05,0.1,0.2,0.3）系列合金,XRD分析表明少量P元素替代,LaFe11.4Si1.6-x P x（x=0.05,0.1,0.2和0.3）合金仍然保持NaZn13型结构,但晶格常数减小。在居里温度T c附近磁化曲线表明,该系列合金经历由磁场引起巡游电子由顺磁态到铁磁态变磁转变的一级相变。随着P含量的增加,LaFe11.4Si1.6-x P x（x=0.05,0.1和0.2）的居里温度T c减小,等温磁熵变也减小。在外加磁场变化为0~1.5 T时,等温磁熵变最大值分别为19.3 J/（kg·K）,15.3 J/（kg·K）和10.3 J/（kg·K）。
LaFe11. 4Si1. 6- x P x（ x =0. 05,0. 1,0. 2 and 0. 3） alloys were prepared by arc melting. By means of X- ray diffraction,the phase structure was investigated. The results show that the LaFe11. 4Si1. 6- x P x（ x =0. 05,0. 1,0. 2 and 0. 3）alloys mainly consist of NaZn13- type cubic structure phase. It is found that the lattice parameter slightly decrease with increasing of x. The thermomagnetization curves of LaFe11. 4Si1. 6- x P x（ x = 0. 05,0. 1 and 0. 2） alloys near Curie temperature have been measured,the results show that the LaFe11. 4Si1. 6- x P x（ x =0. 05,0. 1 and 0. 2） alloys undergo a first- order field- induced transition in an itinerant electron system from the paramagnetic state to the ferromagnetic one. Magnetic measurements show that the Curie temperature and the isothermal entropy change slightly decrease with increasing x. The maximal magnetic entropy changes of LaFe11. 4Si1. 6- x P x（ x = 0. 05,0. 1 and 0. 2） alloys are 19. 3,15. 3 and 10. 3 J/kgK for a magnetic field change from 0 to 1. 5 T.
出处
《稀土》
EI
CAS
CSCD
北大核心
2014年第1期46-49,共4页
Chinese Rare Earths
基金
国家自然科学基金资助项目(51161016)
安徽省高等学校优秀青年人才基金项目(2011SQRL140)
关键词
磁热效应
变磁转变
稀土
magnetocaloric effect
itinerant electron metamagnetic transition
rare earths
