The gallium–indium eutectic alloy is in a focus of modern studies because of its great potential for microelectronics, wearable electronics, electronic skin, medical diagnosis, and soft robotics. Novel applications of the Ga–In alloy require better understanding of the effect of size reduction on its properties. Here we report the NMR studies of the nanostructured Ga–In alloy within pores of the opal matrix. We demonstrated the stabilization of the segregated gallium-rich crystalline phase with a structure of β-gallium, this phase being metastable in bulk. The temperature dependences of the NMR isotropic shift for gallium nuclei within a temperature range from 11 K up to confined alloy melting and of the quadrupole constants for two gallium isotopes were also obtained. The experimental results suggested that only the gallium-rich phase with a structure of β-Ga crystallized under opal nanoconfinement.

镓-铟共晶合金因其在微电子学、可穿戴电子学、电子皮肤、医学诊断和软机器人方面的巨大潜力而​​成为现代研究的焦点。Ga-In 合金的新应用需要更好地了解尺寸减小对其性能的影响。在这里，我们报告了蛋白石基质孔隙内纳米结构 Ga-In 合金的 NMR 研究。我们证明了具有 β-镓结构的分离的富镓结晶相的稳定性，该相在整体上是亚稳态的。还获得了 11 K 至受限合金熔化温度范围内镓核的 NMR 各向同性位移的温度依赖性以及两种镓同位素的四极常数的温度依赖性。