Volume magnetostriction and structure of copper mold-cast polycrystalline Fe-Ga alloys
Volume magnetostriction and structure of copper mold-cast polycrystalline Fe-Ga alloys
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DOI：
10.1063/1.1834692
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发表时间：
2005-02
影响因子：
3.2
通讯作者：
C. Bormio-Nunes;M. A. Tirelli;R. S. Turtelli;R. Grössinger;H. Müller;G. Wiesinger;H. Sassik;
中科院分区：
文献类型：
--
作者：
C. Bormio-Nunes;M. A. Tirelli;R. S. Turtelli;R. Grössinger;H. Müller;G. Wiesinger;H. Sassik;
体积膨胀对Fe 85 Ga 15、Fe 80 Ga 20和Fe 71 Ga 29模铸块体合金的总线性磁致伸缩的影响通过测量在凝固期间纵向和垂直于温度梯度的施加场的长度变化来研究。在磁饱和状态下，由于体积膨胀的贡献，三种合金的饱和磁致伸缩约为总线性磁致伸缩的66%。磁致伸缩强烈地依赖于温度梯度的方向，在该方向上较大。Fe被Ga原子取代增加了晶格常数，并导致A2晶体结构的变化，这被穆斯堡尔谱证实。在4.2 ~ 150 K温度范围内，热膨胀系数随Ga含量的增加而增大。
The effect of the volume expansion on the total linear magnetostriction of Fe85Ga15, Fe80Ga20, and Fe71Ga29 mold-cast bulk alloys was investigated by measuring the change in length with applied field longitudinal and perpendicular to the temperature gradient during solidification. In the magnetically saturated state, due to the contribution of the volume expansion, the saturation magnetostriction for all three alloys was about 66 % of the total linear magnetostriction. The magnetostriction is strongly dependent on the direction of the temperature gradient, being larger in this direction. The substitution of Fe by Ga atoms increases the lattice constant and causes a change to the A2 crystal structure, which was confirmed by Mossbauer spectroscopy. The thermal-expansion coefficient increases with Ga content at temperatures between 4.2 and 150K.