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首页> 外文期刊>Philosophical magazine, B. Physics of condensed matter, electronic, optical, and magnetic properties >Elastic instability in ion-beam-irradiated magnesium aluminate spinel
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Elastic instability in ion-beam-irradiated magnesium aluminate spinel

机译：离子束辐照的铝酸镁尖晶石的弹性不稳定性

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摘要

We present the first observation of an irradiation-induced instability in the shear modulus of MgAl2O4 spinel. Brillouin scattering was used to determine the elastic constant C-44 following 400 keV Xe2+ irradiation of single-crystal spinel at 100 K. The corresponding structural changes were determined using electron microscopy. The results confirm a two-step transformation to the amorphous state through an intermediate metastable crystalline phase. The shear elastic constant decreases by about 35% upon amorphization. This low-temperature radiation response, which is in contrast with the radiation resistance observed at elevated temperatures, is discussued in terms of the ability of spinel to accommodate cation disorder and the free-energy difference between the liquid and solid states.
机译：我们提出了辐射诱导的MgAl2O4尖晶石的剪切模量不稳定性的第一个观察结果。用布里渊散射测定单晶尖晶石在100 K下400 keV Xe2 +辐照后的弹性常数C-44。使用电子显微镜确定相应的结构变化。结果证实了通过中间亚稳态结晶相的两步转变为非晶态。非晶化时，剪切弹性常数降低约35％。与尖晶石适应阳离子紊乱的能力以及液态和固态之间的自由能差有关，讨论了这种低温辐射响应，这与在高温下观察到的辐射阻力相反。

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