Effect of Zn on pinning properties in MgB2 bulk system

✍ Scribed by Y. Kimishima; Y. Sugiyama; S. Numa; M. Uehara; T. Kuramoto

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 353 KB
• Volume: 468
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2008.05.028

✦ Synopsis

Bulk samples of nominal Zn x (MgB 2 ) 1Àx were prepared from the mixture of Mg, B, and ZnO in the Ar atmosphere at 900 °C for 30 min, where x was 0-0.1. Critical current densities J c 's were estimated from the magnetization data using an extended critical state model. Improvement of J c was confirmed at 20 K and 1 T for the sample of x = 0.02-0.04. Secondary phase of Mg-Zn alloy may be the effective pinning centers in this system.