Effect of composition and cooling rate on the structure and magnetic entropy change in Gd5SixGe4-x
Effect of composition and cooling rate on the structure and magnetic entropy change in Gd5SixGe4-x
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DOI：
10.1063/1.1667852
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发表时间：
2004-05
影响因子：
3.2
通讯作者：
A. Yan;A. Handstein;P. Kerschl;K. Nenkov;K. Müller;O. Gutfleisch
中科院分区：
文献类型：
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作者：
A. Yan;A. Handstein;P. Kerschl;K. Nenkov;K. Müller;O. Gutfleisch
研究了成分和冷却速度对Gd5SixGe4−x(x=1.7，2)的结构和磁熵变的影响。铸态和淬火的Gd5Si2Ge2具有较大的磁熵变化，这归因于磁场诱导的相变。这种转变在缓慢冷却的样品中显著减弱，导致较低的磁熵变。Gd5Si2Ge2合金中的Gd5Si2Ge2型相在室温下是亚稳的，而Gd5Si1.7Ge2.3合金中的Gd5Si2Ge2型相在室温下是稳定的。在48T的脉冲场作用下，Gd5Si1.7Ge2.3在室温附近发生了相变。
The effects of composition and cooling rate on the structure and the magnetic entropy change in Gd5SixGe4−x (x=1.7,2) were investigated. A large magnetic entropy change was obtained in cast and quenched Gd5Si2Ge2, which was attributed to a magnetic field-induced phase transition. This transition is significantly weakened in the slowly cooled sample, leading to a lower magnetic entropy change. The Gd5Si2Ge2-type phase in the Gd5Si2Ge2 alloy is metastable at room temperature, while it is stable in the Gd5Si1.7Ge2.3 alloy. The transition can be induced in the Gd5Si1.7Ge2.3 near room temperature by a pulsed field of 48 T.