兰州大学机构库 >物理科学与技术学院
元素替代对稀土大磁致伸缩材料性能的影响及其57Fe穆斯堡尔研究
Alternative TitleThe Effect of Substitution of Elements on the Properties of Giant Magnetostriction Materials of Rare_Earth and it’s 57Fe Mössbauer Study
郑小平
Thesis Advisor李发伸
2002-05-12
Degree Grantor兰州大学
Place of Conferral兰州
Degree Name博士
Keyword磁致伸缩 穆斯堡尔 磁晶各向异性 自旋重取向
Abstract1973年,A.E.Clark等人发现室温下具有大磁致伸缩性能和低磁晶各向异性的稀土超磁致伸缩材料TbxDy1-xFey(x≥0.27,y=1.8~1.98),该材料在机械、电子、军事等方面得到广泛的应用。为了改善材料的应用性能,拓宽应用范围,本论文从应用和基础研究两个角度出发,系统研究了三大系列材料:Tb0.3Dy0.7(Fe1-xAlx)1.95、Tb0.3Dy0.7-yPry(Fe1-xAlx)1.95和Tb0.3Dy0.7(Fe0.9T0.1)1.95 (其中T=Mn,Fe,Co,B,Al,Ga),通过多种表征手段,研究了元素替代对材料电、磁、磁致伸缩、机械等宏观性能及微观电磁特性影响的规律,获得了如下主要结论: 1、少量Al(x≤0.1)替代Fe,Tb0.3Dy0.7Fe1.95化合物磁晶各向异性有所降低;低磁场下(H≤40kA/m)的磁致伸缩有所提高;同时材料的电阻率和机械抗压强度均有较大程度的改善;内禀磁致伸缩常数l111随Al含量的增加单调下降;替代量x>0.15,Tb0.3Dy0.7(Fe1-xAlx)1.95化合物呈顺磁性。 2、随成分和温度的改变,Tb0.3Dy0.7(Fe1-xAlx)1.95化合物的易磁化方向在{110}面上偏离了主轴<111>,随Al含量的增加,自旋重取向温度逐渐降低; 超精细场略有下降;但同质异能移有所增大。 3、Pr替代Dy同样有利于降低Tb0.3Dy0.7-yPry(Fe0.9Al0.1)1.95化合物磁晶各向异性; Pr替代提高了材料铁磁态的Al含量;化合物具有低温磁硬材料的特征。 5、Pr、Al替代量均为0.1时,Tb0.3Dy0.7-yPry(Fe1-xAlx)1.95化合物具有最高的磁致伸缩与磁晶各向异性之比,该成分点极有希望成为非常有实用价值的大磁致伸缩材料;随Pr含量的增加,Tb0.3Dy0.7-yPry(Fe0.9Al0.1)1.95化合物的l111迅速增大,易磁化方向在{110}面上绕主轴<111>作微小转动。 6、Al,Ga元素替代,有利于降低材料的磁晶各向异性,化合物具有低温磁硬材料的特征,而B,Mn,Co替代的化合物无低温磁硬材料的特征。过渡金属Mn、Co替代Fe使l111略有增大或基本不变,而B、Al、Ga替代Fe,却使l111有很大的下降,因此,Mn、Co替代所导致的饱和磁致伸缩下降幅度比B、Al、Ga替代要小得多。 7、Al、Ga替代Fe使Tb0.3Dy0.7(Fe0.9T0.1)1.95化合物的易磁化方向可能在{111}面内偏移了主轴, B、Mn、Co替代未使易磁化轴发生明显转动;除Co元素外,其它元素替代Fe使超精细场略有下降,而同质异能移均增大。
Other AbstractSince A. E. Clark et al. discovered rare-earth giant magnetostriction material of TbxDy1-xFey(x≥0.27,y=1.8~1.98) of high magnetostriction and low magnetocrystalline anisotropy at room temperature in 1973, it has been applied widely in many fields and called Terfeno1-D commercially. In order to improve the practical properties and widen application areas, this thesis performed systematically the studies of the three sequences of Tb0.3Dy0.7(Fe1-xAlx)1.95,Tb0.3Dy0.7-yPry(Fe1-xAlx)1.95and Tb0.3Dy0.7(Fe0.9T0.1)1.95 (T=Mn,Fe,Co,B,Al,Ga). The effects of element substitution on the properties of Tb0.3Dy0.7Fe1.95 compounds were investigated. The main results from the studies are described below: 1.After substituting Al(x≤0.1) for Fe, magnetocrystalline anisotropy decreases. The ls increases in the low field and the l111 decreases with increasing x-value. The electric property and mechanical strength have been improved. The compounds become paramagnetism while the Al is more than 0.15. 2.It was found that the easy magnetization direction (EMD) may deviate from <111> with the component and temperature. 3.Similarly, substituting Pr(x≤0.1) for Dy is beneficial to reduce magnetocrystalline anisotropy. While the concentration of both Al and Pr is 0.1 respectively, the ratio of magnetostriction and magnetocrystalline anisotropy is the largest. So this component is greatly hopeful to become quite practical material. The l111 increases rapidly, the deviation of EMD from the major axis of symmetry <111> is a little bit with the increasing y. 4.Al and Ga substitution is more beneficial to reduce magnetocrystalline anisotropy. These compounds substituted by Al and Ga are characteristic of the low-temperature hard magnetic material, but those compounds substituted by B, Mn and Co are not. The l111 increases slightly or keeps constant when Fe is substituted by Mn and Co, whereas it decreases largely when Fe is replaced by B, Al as well as Ga. Consequently, the decrease of polycrystal magnetostriction ls due to Mn and Co substitution is very smaller than that due to B, Al and Ga substitution. 5.The EMD of Tb0.3Dy0.7-yPry(Fe0.9T0.1)1.95 substituted by Al and Ga may deviate slightly from the major axis of symmetry <111>, but doesn’t shift when Fe is replaced by B, Mn and Co
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Language中文
Document Type学位论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/229032
Collection物理科学与技术学院
Recommended Citation
GB/T 7714
郑小平. 元素替代对稀土大磁致伸缩材料性能的影响及其57Fe穆斯堡尔研究[D]. 兰州. 兰州大学,2002.
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