| 低场下退磁效应对磁制冷材料磁熵变的影响 |
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| 引用本文： | 马涛,龙毅,鲍博,傅斌,王小强,靳岚峰.低场下退磁效应对磁制冷材料磁熵变的影响[J].稀有金属,2010,34(1). |
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| 作者姓名： | 马涛 龙毅 鲍博 傅斌 王小强 靳岚峰 |
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| 作者单位： | 北京科技大学材料科学与工程学院,北京,100083 |
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| 基金项目： | 国家自然科学基金和国家高技术研究发展计划 |
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| 摘 要： | 磁熵变化值是衡量磁制冷材料好坏的一项重要指标。基于前差商的数值方法,利用温度插值方法分别计算了球体材料和长径比为5的长圆柱体材料的在低场下(2T)扣除退磁场后的实际磁熵变,研究了由材料形状引起的退磁效应对磁制冷材料磁熵变的影响。结果表明,长圆柱体材料的实际磁熵变最接近无退磁场情况下的理论值,而球体材料退磁场很大,其实际磁熵变大大低于理论值;随外场的增强,退磁场对磁熵变的影响逐渐减弱;另外随温度升高退磁场所带来的影响逐渐减弱;若材料本身的磁熵变数值较大,则退磁场的影响相对较小。
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| 关 键 词： | 温度插值 退磁场 退磁因子 磁熵变 |
Influence of Demagnetizing Effects on Entropy Change of Magnetocaloric Materials under Low Magnetic Fields |
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| Ma Tao,Long Yi,Bao Bo,Fu Bin,Wang Xiaoqiang,Jin Lanfeng.Influence of Demagnetizing Effects on Entropy Change of Magnetocaloric Materials under Low Magnetic Fields[J].Chinese Journal of Rare Metals,2010,34(1). |
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| Authors: | Ma Tao Long Yi Bao Bo Fu Bin Wang Xiaoqiang Jin Lanfeng |
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| Affiliation: | Ma Tao,Long Yi,Bao Bo,Fu Bin,Wang Xiaoqiang,Jin Lanfeng (School of Materials Science , Engineering,University of Science , Technology Beijing,Beijing 100083,China) |
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| Abstract: | The magnetic entropy changes were the benchmark for the application of the magnetocaloric materials. In this paper,the net entropy changes under low magnetic fields (<2 T) ,values eliminating the influence of demagnetizing effect of spherical materials and cylindrical materials with the length-diameter of 5 were calculated by using the temperature interpolation method,which was based on the forward difference quotient principle. Results indicated that the net entropy changes of materials with the cylindrica... |
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| Keywords: | temperature interpolation demagnetizing field demagnetizing factor magnetic entropy changes |
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