M Melone, M T Malachevsky, C E Sobrero, H Troiani, A Serquis
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引用次数: 0
Abstract
Carbon doping is studied in MgB2 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(B1-xCx)2 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 105 A cm-2 at 3 T and 20 K, named the 900-20-C-nanoSiC sample.
采用固相法一步合成MgB2球团，分别采用未掺杂硼和掺杂碳硼，并在其中添加纳米sic。采用粉末x射线衍射和Rietveld细化法对合成过程中相形成随时间的变化进行了跟踪。用磁强计表征了掺杂引起的超导性能变化。Mg(B1-xCx)2在不同的合成温度下由不同的纳米沉淀物组成。在低温(700℃)下，纳米sic的加入阻止了相的形成。然而，在900°C下，同时使用C和SiC处理的样品获得了最佳的超导性能，在3 T和20 K下，临界电流密度为105 a cm-2，称为900-20-C纳米SiC样品。
期刊介绍：
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials publishes scientific articles related to the structural science of compounds and materials in the widest sense. Knowledge of the arrangements of atoms, including their temporal variations and dependencies on temperature and pressure, is often the key to understanding physical and chemical phenomena and is crucial for the design of new materials and supramolecular devices. Acta Crystallographica B is the forum for the publication of such contributions. Scientific developments based on experimental studies as well as those based on theoretical approaches, including crystal-structure prediction, structure-property relations and the use of databases of crystal structures, are published.
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