Magnetic, magnetocaloric, and magnetoelastic properties of LaFe11.57Si1.43Bx compounds
Magnetic, magnetocaloric, and magnetoelastic properties of LaFe11.57Si1.43Bx compounds
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DOI：
10.1063/1.3225995
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发表时间：
2009-09
影响因子：
3.2
通讯作者：
A. Pathak;P. Basnyat;I. Dubenko;S. Stadler;N. Ali
中科院分区：
文献类型：
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作者：
A. Pathak;P. Basnyat;I. Dubenko;S. Stadler;N. Ali
利用磁化和应变测量技术研究了LaFe_（11.57）Si_（1.43）Bx化合物在0<x≤1.64浓度区间的磁性、磁热和磁弹性性质。晶胞参数和居里温度分别随B浓度的增加而线性增加，最高可达0.1%和9%。在TC附近观测到约0.22%的正磁量异常。磁体积耦合常数估计约为3×10−3 [μB/Fe原子]−2。TC下的磁熵变与B浓度的关系不大。对于x=1.64，观察到滞后损失相对于基础化合物（x=0）小约十倍。因此，表明LaFe 11.57 Si 1.43的磁热效应的特性可以通过改变LaFe 11.57 Si 1.43 Bx系统中的B浓度来调节。讨论了晶胞体积和电子浓度变化对TC的相对重要性。
We have studied the magnetic, magnetocaloric, and magnetoelastic properties of LaFe11.57Si1.43Bx compounds in the concentration interval 0<x≤1.64 using magnetization and strain gauge techniques. The crystal cell parameters and Curie temperatures were found to increase linearly with increasing B concentrations up to ∼0.1% and 9%, respectively. A positive magnetovolume anomaly of about 0.22% was observed in the vicinity of TC. The magnetovolume coupling constant was estimated to be approximately 3×10−3 [μB/Fe atom]−2. Magnetic entropy changes at TC slightly depended on B concentration. A hysteresis loss of about ten times smaller relative to the base compound (x=0) was observed for x=1.64. Therefore it was shown that the characteristics of the magnetocaloric effect of LaFe11.57Si1.43 can be adjusted by a change in B concentration in the LaFe11.57Si1.43Bx system. The relative importance of the variation in the volume of crystal cell and electron concentration on TC was discussed.