MgB2 fabrication by diffusion-controlled three layered (B-Mg-B) technique
Küçük Resim Yok
Tarih
2011
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Pergamon-Elsevier Science Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
MgB2 was successfully fabricated through diffusion-controlled three-layered (B-Mg-B) technique under high pressure. Due to melting temperature of Mg, the material was pre-heat treated at 600 degrees C between 1 and 48 h. Optimum pre-heat treatment condition was found to be 600 degrees C for 48 h. Then, the compacted material was grinded and pelletized under pressure of 2 ton. The pellets were heat treated at 600-900 degrees C for 1-48 h. Optimum heat treatment condition was determined to be 800 degrees C for 1 h for formation of almost pure MgB2. Diffusion coefficient was determined with Fick's law and EDX data. Diffusion coefficient value for B in Mg matrix and Mg in B matrix was determined to be 1.66 x 10(-7) and 3.14 x 10(-8) cm(2)/sn, respectively. Best T-c value (39.4 K) was obtained for material heat treated at 800 degrees C for 1 h. A symmetric hysteresis was obtained for the best MgB2 material and magnetization decreased with increase in the temperature and the applied magnetic field. (C) 2011 Elsevier Ltd. All rights reserved.
Açıklama
Anahtar Kelimeler
Superconductors, Electron microscopy, Electrical properties, Magnetic properties
Kaynak
Journal of Physics and Chemistry of Solids
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
72
Sayı
9
