The influence of Sm_(2)O_(3)dopant on structure,morphology and transport critical current density of MgB_(2)wires investigated by using the transmission electron microscope  

作　　者：Daniel Gajda MichałBabij Andrzej Zaleski Dogan Avci Fırat Karaboga Hakan Yetis Ibrahim Belenli Dariusz Zasada Damian Szymanski Małgorzata Małecka Wojciech Gil Tomasz Czujko 

机构地区：[1]Institute of Low Temperature and Structure Research,Polish Academy of Sciences(PAS),50-422 Wroclaw,Poland [2]Quatum Metrology Laboratory,National Metrology Institute TÜBITAK,41470 Kocaeli,Turkey [3]Mehmet Tanrikulu Vocational School of Health Services,Bolu Abant Izzet Baysal University,14030 Bolu,Turkey [4]Department of Physics,Bolu Abant Izzet Baysal University,14280 Bolu,Turkey [5]Institute of Materials Science and Engineering,Military University of Technology,00-908 Warsaw,Poland [6]Faculty of Chemsitry,University of Wrocław,50-383 Wrocław,Poland

出　　处：《Journal of Magnesium and Alloys》2024年第12期5061-5078,共18页镁合金学报(英文)

基　　金：funded by the National Science Center-Miniatura 7-no.2023/07/X/ST5/00335 and the Scientific and Technological Research Council of Turkey(TUBITAK)(Grant number:219M270)。

摘　　要：This study reports results for the morphology,crystal structure and critical parameters of Sm_(2)O_(3)-doped MgB_(2)wires with low and high initial filling densities.The transmission electron microscope(TEM)images were done for the longitudinal section of MgB_(2)wires.The results show that the Sm_(2)O_(3)admixture significantly changes the morphology of the MgB_(2)material,accelerates the formation of the MgB_(2)phase,does not form rectangular MgB_(2)crystallites,does not leave pure Mg,and forms Sm_(2)O_(3)areas of 10 nm and 20 nm.The effects of Sm_(2)O_(3)addition on MgB_(2)formation in superconducting wires were revealed in detail in this study.Additionally,Sm_(2)O_(3)causes the formation of point pinning regions that significantly increase the critical transport current density at the temperature range from 15 K to 30 K.The TEM images point out that rectangular MgB_(2)crystallites are formed in undoped Mg B_(2)wires,which have not been previously reported XRPD results showed that short-term heating allowed obtaining a larger amount of MgB_(2)phase for the MgB_(2)wire with high initial filling density.On the other hand,long heating time and high initial density slow down the creation of MgB_(2)phase when the Mg is in the solid state.

关 键 词：MgB_(2)wire Sm_(2)O_(3) PINNING TEM 

分 类 号：TQ132.2[化学工程—无机化工]