Among the Iron Based Superconductors, the so-called 1144 family attracts significant interest due to its high critical fields and critical current densities and to the stoichiometric nature of the compounds, disentangling the superconducting properties from the compositional homogeneity. Their practical application is partly hindered by the severe and strict synthesis conditions, complicated by high temperature ( T > 900 °C) treatments of volatile and toxic elements. In this work, a milder synthetic approach to produce 1144 materials is proposed. A simple one-step High Energy Ball Milling treatment of the pure elements is coupled to a low temperature (i.e. 600 °C) thermal treatment to produce the superconducting Ca/K-1144 material, characterized by a good degree of homogeneity and critical temperatures higher than 30 K. The results here reported demonstrate the previously excluded feasibility of a simple and easily scalable lower temperature synthesis route for a Ca/K-1...

中文翻译：

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1144 Ca-K铁基超导体的机械化学辅助低温合成路线

在铁基超导体中，所谓的1144系列由于其高临界场和临界电流密度以及化合物的化学计量性质而引起了人们的极大兴趣，从而使超导特性与成分均匀性脱钩。严格严格的合成条件，以及对挥发性和有毒元素的高温（T> 900°C）处理使其复杂化，部分地阻碍了它们的实际应用。在这项工作中，提出了一种温和的合成方法来生产1144种材料。纯元素的简单一步高能球磨处理与低温（即600°C）热处理相结合，以生产超导Ca / K-1144材料，其特征是具有良好的均质度和较高的临界温度超过30K。