Caracterización de Materiales, Instituto de Nanociencia y Nanotecnogía, CNEA/CONICET/IB, 9500 Bustillos Avenue Bariloche, Rio Negro 8400, Argentina.
Acta Crystallogr B Struct Sci Cryst Eng Mater. 2023 Feb 1;79(Pt 1):73-77. doi: 10.1107/S205252062201191X. Epub 2023 Jan 18.
Carbon doping is studied in MgB pellets during one-step synthesis by solid-state reaction, employing both undoped and carbon-doped boron with and without the addition of nano-SiC. The phase formation during the synthesis as a function of time was followed using powder X-ray diffraction and Rietveld refinement. The superconducting properties were characterized with a magnetometer to investigate doping-induced changes. Mg(BC) is obtained with nano-precipitates and different compositions depending on the synthesis temperature. It is found that the addition of nano-SiC prevents the phase formation at low temperature (700°C). Nevertheless, the best superconducting properties are obtained for the sample treated at 900°C using simultaneously C and SiC, with a critical current density of 10 A cm at 3 T and 20 K, named the 900-20-C-nanoSiC sample.
在一步固相反应法合成 MgB 颗粒期间，通过使用未掺杂和掺杂碳的硼以及添加和不添加纳米-SiC 来研究碳掺杂。通过粉末 X 射线衍射和 Rietveld 精修跟踪合成过程中随时间的相形成。使用磁力计来研究掺杂诱导的变化来表征超导性能。随着纳米沉淀物的形成和不同的合成温度，得到了 Mg(BC)。发现，即使添加纳米-SiC，在低温（700°C）下也会阻止相形成。然而，使用同时 C 和 SiC 在 900°C 下处理的样品具有最佳的超导性能，在 3 T 和 20 K 时的临界电流密度为 10 A cm，命名为 900-20-C-nanoSiC 样品。
