Moment-volume instabilities in alloys with compositions around the C14 laves phase
Moment-volume instabilities in alloys with compositions around the C14 laves phase
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DOI：
10.1007/s100510050454
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发表时间：
1998-10
期刊：
影响因子：
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通讯作者：
E. Wassermann;B. Rellinghaus;T. Roessel;J. Kästner;W. Pepperhoff
中科院分区：
文献类型：
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作者：
E. Wassermann;B. Rellinghaus;T. Roessel;J. Kästner;W. Pepperhoff
我们测量了 x= 30.5、32.5 和 35 的 TixFe100-x 合金的热膨胀和比热，这些合金均具有与 TiFe2 类似的六方 C14 Laves 相结构 (MgZn2)，并确定了磁对热膨胀和比热 cmag 的贡献与温度的关系。对于固定成分和cmag(T)表现出相同类型的行为，证明两种异常具有相同的微观性质。它们源自矩量涨落（反铁磁殷钢效应），与 TiFe2 揭示的原子体积和矩函数的总能量计算进行比较。
We measured the thermal expansion and the specific heat of TixFe100-xalloys withx= 30.5, 32.5 and 35, all with hexagonal C14 laves phase structure (MgZn2) like TiFe2, and determine the temperature dependence of the magnetic contributions to the thermal expansion and the specific heat cmag. For fixed composition andcmag(T)show the same type of behavior, demonstrating that both anomalies are of the same microscopic nature. They originate from moment-volume fluctuations (antiferromagnetic Invar-effect) as a comparison with total energy calculations as a function of atomic volume and moment for TiFe2reveals.