Dubrovinsky L, Dubrovinskaia N, Abrikosov I A, Vennström M, Westman F, Carlson S, van Schilfgaarde M, Johansson B
Department of Earth Sciences, Uppsala University, S-752 36 Uppsala, Sweden.
Phys Rev Lett. 2001 May 21;86(21):4851-4. doi: 10.1103/PhysRevLett.86.4851.
We have measured the pressure-volume (P-V) relations for cubic iron-nickel alloys for three different compositions: Fe 0.64Ni (0.36), Fe 0.55Ni (0.45), and Fe 0.20Ni (0.80). It is observed that for a certain pressure range the bulk modulus does not change or can even decrease to some minimum value, after which it begins to increase under still higher pressure. In our experiment, we observe for the first time a new effect, namely, that the Fe-Ni alloys with high Ni concentrations, which show positive thermal expansion at ambient pressure, become Invar system upon compression over a certain pressure range.
我们测量了三种不同成分的立方铁镍合金的压力-体积（P-V）关系：Fe 0.64Ni（0.36）、Fe 0.55Ni（0.45）和Fe 0.20Ni（0.80）。观察到在一定压力范围内，体积模量不变，甚至可能降至某个最小值，此后在更高压力下它开始增加。在我们的实验中，我们首次观察到一种新现象，即在环境压力下表现出正热膨胀的高镍浓度Fe-Ni合金，在一定压力范围内压缩后会变成因瓦合金体系。
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