颗粒尺寸对LaFe_(11.5)Si_(1.5)合金磁热性能的影响  

Influence of Particle Size and Annealing on Magnetocaloric Effect for LaFe_(11.5)Si_(1.5) Alloy

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作  者:田娜[1] 杨坤[1] 刘晶[1] 游才印[1] 

机构地区:[1]西安理工大学材料科学与工程学院,陕西西安710048

出  处:《稀土》2014年第5期69-72,共4页Chinese Rare Earths

基  金:国家自然科学基金项目资助(51371140;51171148);教育部博士点基金新教师类项目资助(2011611812003);陕西省自然科学基金项目资助(2013JQ6008);陕西省普通高校重点学科专项

摘  要:利用X射线衍射及磁性测量分析,研究了LaFe11.5Si1.5粉末样品的相结构和磁性能。结果表明,合金主相具有NaZn13型结构,有少量α-Fe和LaFeSi杂相。随粉末粒径降低,样品的磁滞损失减小,粒径大于110μm的LaFe11.5Si1.5颗粒的磁滞约为4.44 J/kg,而小于30μm的LaFe11.5Si1.5的磁滞为2.31 J/kg。同时还观察到低温退火处理也能够降低颗粒的磁滞损失。降低LaFe11.5Si1.5系合金的颗粒尺寸和低温退火均有利于获得小的磁滞损失。The phase structure and magnetocaloric effect of LaFe11.5Si1.5powder sample were studied by using X-ray diffraction and magnetic measurements.The results showed that the alloy consists of NaZn13-type compound with a small amount of α-Fe and LaFeSi impurity phases.Hysteresis loss was getting smaller with reducing the particle size.The maximal magnetic hysteresis loss reduced from the value of 4.44 J /kg with particle sizes larger than 110 μm to 2.31 J /kg for the particle sizes smaller than 30 μm.Simultaneously,it was found that the low temperature annealing is also helpful for reducing the magnetic hysteresis loss of the samples with different particle sizes.The results indicated that suitable particle refinement and low temperature annealing are useful ways to reduce the hysteresis loss of LaFe11.5Si1.5-based magnetocaloric materials.

关 键 词:LaFe11.5Si1.5化合物 磁热效应 低温退火 磁滞损失 

分 类 号:TB34[一般工业技术—材料科学与工程]

 

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