铟在过冷至12 K液态镓中的溶解度
The solubility of indium in liquid gallium supercooled to 12 K
摘要：
采用扰动角相关法（PAC）确定了金属间化合物FeGa 3中111 In杂质探针原子的晶格位置。在轻微的Ga贫样品，探针被发现强烈喜欢两个不等价的Ga网站之一。在稍富镓样品在室温下，293 K，PAC光谱表现出未受干扰的四极相互作用信号，这是一致的铟探针溶解在小的液体池中的过量镓。无数这样的池可能位于样品中的晶界上。从293 K冷却到12 K，铟在液体中的位点分数降低，被归因于铟溶质在Ga池的侧面与其他杂质的沉淀物中的信号的增加所抵消。然而，这些变化在加热时是完全可逆的，并且在低至12 K时没有观察到液体镓池的结晶。这是由于这些池的体积非常小，虽然没有直接测量，但比立方微米小几个数量级。测量的铟在液体中的位置分数的温度依赖性被用于将铟在液体镓中的亚稳溶解度曲线向下延伸到150 K的温度，远低于Ga-In的共晶温度288.5 K。
英文摘要：
The method of perturbed angular correlation (PAC) was used to determine lattice locations of 111In impurity probe atoms present in extreme dilution in the intermetallic compound FeGa3. In slightly Ga-poor samples, probes were found to strongly prefer one of two inequivalent Ga-sites. In slightly Ga-rich samples at room temperature, 293 K, the PAC spectrum exhibited an unperturbed quadrupole interaction signal that is consistent with indium probes dissolved in small liquid pools of the excess Ga. A myriad of such pools are probably located along grain boundaries in the sample. Cooling from 293 K down to 12 K, the site fraction of indium in liquid decreased, being offset by the increase in a signal attributed to indium solutes in precipitates with other impurities at the sides of the Ga pools. However, these changes were completely reversible upon heating, and no crystallization of the liquid gallium pools was observed down to 12 K. This is attributed to the extraordinarily small volumes for the pools, which, while not measured directly, are orders of magnitude smaller than cubic microns. The measured temperature dependence of the site fraction of indium in the liquid was used to extend the metastable solubility curve for indium in liquid gallium down to a temperature of 150 K, much lower than the eutectic temperature of Ga-In at 288.5 K.
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