Spark plasma sintering of MgBb>2b> in the two-temperature route

详细信息	查看全文 | 推荐本文 |

• 作者：G. Aldica^a ; D. Batalu^b ; S. Popa^a ; I. Ivan^a ; P. Nita^c ; Y. Sakka^d ; O. Vasylkiv^d ; L. Miu^a ; I. Pasuk^a ; P. Badica^a ; ^{badica2003@yahoo.com} ; ^{badpet@infim.ro}
• 关键词：MgB2 ; Spark plasma sintering ; Two-temperature route ; Superconducting properties
• 刊名：Physica C
• 出版年：2012
• 期刊代码：80_09214534
• 类别：ms
• 出版时间：July, 2012
• 卷：477
• 期：Complete
• 页码：43-50
• 文件大小：1510 K

摘要

Superconducting bulks of MgBb>2b> were obtained by an ex-situ two-temperature route applied to spark plasma sintering (SPS). Processing of samples was performed at lower temperatures than previously reported. Samples produced by the two-temperature route show a higher morphological uniformity, a higher density (above 98%), a higher Vickers hardness, and undesirable stronger microscale flux jumps, as indicated by magnetic relaxation measurements when compared to a sample obtained by the one-temperature route (95.3%relative density). At the same time, all sintered samples show approximately constant crystallite size, critical current density, irreversibility field, critical temperature, weight fraction of impurity phases (MgBb>4b> and MgO), and the amount of carbon accidentally introduced during SPS processing.